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FX2N-2LC Temperature Control Block USER`S MANUAL

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1. Table 7 1 BFM No iti Name Description set range tial Remarks CH1 CH2 value 36 55 Control response parameter 0 Slow 1 Medium 2 Fast 0 37 56 Output limiter upper limit a In IO 100 0 A 38 57 Output limiter lower limit 5 0 to output limiter upper limit 0 0 A 0 0 to 100 0 sec 39 58 Output change ratio limiter When 0 0 is set function is 0 0 A disabled Sensor correction value setting CON 40 59 PV bias 50 00 of input span 0 00 A 41 60 Adiustment sensitivity dead 0 9 to 10 0 of input span 1 0 A zone setting 42 61 Control output cycle setting 1 to 100 sec 30 i N 0 to 100 sec 43 62 Abe delay digital filter When 0 is set function is 0 9 disabled 0 0 to 100 0 min 44 63 Setting change ratio limiter When 0 0 is set function is 0 0 A disabled 45 64 AT auto tuning bias Input span C F 0 0 E 46 65 Normal reverse operation o Normal operation 4 qe selection 1 Reverse operation 47 66 Setting limiter upper limit Setting NANGI lower lon tompa 1300 R W a range upper limit 48 67 Setting limiter lower limit Input ang lower lima to Seming 100 u limiter upper limit Loop breaking alarm judgement O10 7 200 see 49 68 00P g judg When 0 is set alarm func
2. a MITSUBISHI 2 2 FX2N 2LC Temperature Control Block Product Configuration 2 2 4 Installation method The FX2n 2LC can be installed on the right side of an FX1n FX2n FX2NC FX3u FX3uc Series PLC main unit FX2n FX2NC FX3u FX3uc Series extension unit or another extension block The FX2n 2LC can be attached with a DIN rail DIN46277 width 35 mm or directly attached to a panel surface with screws M4 Installation on DIN rail Align the upper side of the DIN rail mounting groove of the FX2n 2LC with a DIN rail DIN46277 width 35 mm O and push the FX2n 2LC on the DIN rail 9 When removing the FX2n 2LC pull out downward the DIN rail mounting hook then remove the FX2n 2LC 0 When attaching to DIN rail When removing from DIN rail ES De a Direct installation on panel surface Screw tighten the FX2n 2LC with M4 screws to a panel surface using two upper and lower mounting holes provided on the left side of the FX2n 2LC Assure the interval of 1 to 2 mm between a unit or block installed on the left side of the FX2n 2LC Cautions on installation Use the unit in the environment for the general specifications described in the manual Never use the unit in a place with dusts soot conductive dusts corrosive gas or flammable gas place exposed to high temperature dew condensation or rain and wind or place exposed to vibration or impact I
3. eal 4 N ame mim mm IT MITSUBISHI PWRO Power e a fm amp power ones v a ELSE Far MR ann PXar2LO MESEC For SER Ei PXar2LC 22 E TET au o w o BA O oa EN Es H es INS AD o our o YOOO to Y017 Special Special Y020 to Y037 Special E j oj block block block No 0 No 1 No 2 indicates the I O No assignment in the PLC main unit e Up to eight FX2n 2LC units can be connected to the FXin FX2n FX3u FX3uc Series PLC Up to four FX2n 2LC units can be connected to the FX2nc Series PLC e When connecting the FX2n 2LC unit to the FX2nc Series PLC the interface FX2nc CNV IF is required e For extension an extension cable FXon 65EC 650 mm and the FX2n CNV BC sold separately are required Only one FXon 65EC can be used per system 1 Up to seven FX2n 2LC units can be connected to the FX3uc 32MT LT PLC Unit numbers assigned to special function units blocks begins with No 1 a MITSUBISHI 2 4 FX2N 2LC Temperature Control Block Specifications 3 1 Introduction 2 Product Configuration 3 Specifications 4 Wiring 5 Introduction of Functions 6 Alarm 7 Buffer Memory BFM 8 Program Example 9 Diagnostic a MITSUBISHI FX2N 2LC Temperature Control Block Specifications 3 a MITSUBISHI FX2N 2LC Temperature
4. Non alarm status Upper lower limit deviation alarm When the absolute deviation Measured value PV Set value SV is more than the alarm set value an alarm is issued For example if the alarm set value is 10 C an alarm is issued when the measured value PV is outside the range from set value SV 10 C to set value SV 10 C Measured value PV Measured value PV Alarm set value Temperature set value SV gt i Deviation Alarm set value Deviation Time Non alarm status Alarm status Alarm status Range alarm When the absolute deviation Measured value PV Set value SV is less than the alarm set value an alarm is issued For example if the alarm set value is 10 C an alarm is issued when the measured value PV is inside the range from set value SV 10 C to set value SV 10 C Measured value PV Measured value PV Alarm set value Temperature set value SV gt Deviation gt Deviation Alarm set value Time Non alarm status Alarm status Alarm status a MITSUBISHI 6 4 FX2N 2LC Temperature Control Block Alarm 6 Alarm wait operation The wait operation ignores the alarm status of the measured value PV occurred when the power is turned ON and disables the alarm func
5. Table 7 8 Alarm u Set No Alarm type Description range 0 Alarm function OFF Alarm function is disabled mh When measured value PV is more than alarm set Input 1 Upper limit input value alarm Ze value an alarm is issued range KN When measured value PV is less than alarm set Input 2 Lower limit input value alarm ie value an alarm is issued range When deviation Measured value PV Set snout 3 Upper limit deviation alarm value SV is more than alarm set value an alarm ln is issued When deviation Measured value PV Set incu 4 Lower limit deviation alarm value SV is less than alarm set value an alarm gin is issued When absolute deviation Measured value PV input 5 Upper lower limit deviation Set value SV is more than alarm set value an IE alarm is issued When absolute deviation Measured value PV Ani 6 Range alarm Set value SV is less than alarm set value an aan alarm is issued NA When measured value PV is more than alarm set Upper limit input value alarm ime Input 7 value an alarm is issued However when power is with wait e range turned ON measured value is ignored eee When measured value PV is less than alarm set Lower limit input value alarm pat Input 8 A f value an alarm is issued However when power is with wait ER range turned ON measured value is ignored When deviation Measured value PV Set 9 Upper limit deviation value value SV is more than
6. X003 Performs auto TO KO K 20 K 1 K 1 tuning CH1 X004 tz Performs auto TO KO K 29 K 1 K 1 tuning CH2 END Initializes all data When X000 is set to ON all data is initialized When initialization is not necessary this line can be omitted Error reset command When X001 is set to ON all errors indicated by the flag BFM 0 are reset Starts stops control When X002 turns OFF control stops When X002 turns ON control starts In order to turn OFF the control output this line is required and cannot be omitted The control output cannot be set to OFF by changeover from RUN to STOP of the PLC main unit In this example only the auto mode is used When changeover of the mode is necessary write K1 to BFM 18 and BFM 27 in accordance with the changeover condition Performs auto tuning When X003 X004 is set to ON auto tuning is performed Once auto tuning has started it continues even if X003 X004 is set to OFF after that When the flag M34 M54 turns OFF while auto tuning is performed it is judged that auto tuning is completed Then KO is written to BFM 20 29 By this writing auto tuning can be performed again If auto tuning does not have to be performed again upper two lines can be omitted M34 and M54 turn ON and off in accordance with the event status e Ina practical program if th
7. Alarm status Lower limit input value alarm When the measured value PV is less than the alarm set value an alarm is issued Measured value PV Measured value PV BT Alarm set value gt MENTA Alarm status Non alarm status Alarm status Upper limit deviation alarm When the deviation Measured value PV Set value SV is more than the alarm set value an alarm is issued lt When the deviation is positive gt lt When the deviation is negative gt Measured value Measured value PY Meas value Pv Measured value PV Alarm set x Temperature gt value Devia set value SV tion Alarm set gt Temperature gt set value SV value Time Alarm status Alarm status Non alarm status a MITSUBISHI 6 3 FX2N 2LC Temperature Control Block Alarm 6 Lower limit deviation alarm When the deviation Measured value PV Set value SV is less than the alarm set value an alarm is issued lt When the deviation is positive gt lt When the deviation is negative gt Measured value Measured value Measured value PV PV PV Measured value PV Alarm set ES Temperature gt value pee set value SV Temperature tion set value SV Alarm set value gt Time Alarm status Alarm status
8. Check whether or not the FX2n 2LC is correctly connected to the PLC Check the connector positions and the connection status Check whether or not the used capacity of the service power supply of the PLC main unit exceeds the allowable range a MITSUBISHI 9 2 USER S MANUAL FX2n 2LC Temperature Control Block 2 MITSUBISHI ELECTRIC CORPORATION HEAD OFFICE TOKYO BUILDING 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN HIMEJI WORKS 840 CHIYODA CHO HIMEJI JAPAN MODEL FX2N 2LC U E MODEL CODE 09R607 JY992D85801E Effective Sep 2007 MEE Specification are subject to change without notice
9. 2 Measured value monitor Temperature alarm Control Selected by buffer memory Heater disconnection detection Operation mode Adjustment data and input value are checked by watch dog timer When abnormality is detected transistor output turns OFF Memory Built in EEPROM Number of times of overwrite 100 000 times Self diagnosis function POWER Lit green 5 V power is supplied from PLC main unit Extinguished 5 V power is not supplied from PLC main unit SAN Lit red 24 V power is supplied from outside Status Extinguished 24 V power is not supplied from outside indication Sur Lit red OUT1 output is ON Extinguished OUT1 output is OFF Lit red OUT2 output is ON OUT2 _ Extinguished OUT2 output is OFF a MITSUBISHI 3 2 FX2N 2LC Temperature Control Block Specifications 3 3 4 Input specifications Table 3 4 Item Description Number of input points 2 points Th rmsc pi K J R S E T B N PLII WRe5 26 U L Pe JIS C 1602 1995 Input type i ati Pe a 3 wire Pt100 JIS C 1604 1997 JPt100 JIS C 1604 1981 bulb 0 7 of range span 1 digit 0 3 of range span 1 digit when ambient temperature Measurement precision 220530 p However O to 399 C 0 to 799 F in B inputs as well as O to 32 F in PLII and WRe5 26 inputs are outside precision guarantee range
10. a MITSUBISHI 3 5 FX2N 2LC Temperature Control Block Specifications 3 MEMO a MITSUBISHI 3 6 FX2N 2LC Temperature Control Block Wiring 4 1 Introduction 2 Product Configuration 3 Specifications 4 Wiring 5 Introduction of Functions 6 Alarm 7 Buffer Memory BFM 8 Program Example 9 Diagnostic a MITSUBISHI FX2N 2LC Temperature Control Block Wiring 4 a MITSUBISHI FX2N 2LC Temperature Control Block Wiring 4 4 Wiring N Cautions on Wiring Make sure to shut down the power supplies of all phases on the outside before starting installation or wiring If the power supplies are not shut down you may get electrical shock or the unit may be damaged As to loads which are dangerous when turning ON at the same time make sure to interlock them outside the PLC and the FX2n 2LC in addition to interlocking of them in a program in the PLC Connect the power cable of the FX2n 2LC temperature control block and the PLC as explained in the contents of this manual The product maybe seriously damaged if an AC power supply is connected to the DC I O terminal or DC power terminal Never perform external wiring to unused terminals Le in the FX2n 2LC and the PLC Such wiring may damage the units Perform Class 3 grounding with an electric wire of 2 mm or more to the grounding terminal in the FX2n 2LC and the PLC However
11. 18 200 0 to 200 0 10 1 C 42 300 0 to 300 0 10 1 F 19 200 0 to 400 0 10 1 C 43 300 to 1100 F 20 T 0 0 to 400 0 10 1 C 21 300 0 to 400 0 10 1 F 22 300 0 to 700 0 10 1 F 23 0 0 to 700 0 10 1 F 2 For B inputs O to 399 C 0 to 799 F is outside the precision compensation range 3 For PLII inputs O to 32 F is outside the precision compensation range 4 For WRe5 to WRe26 inputs 0 to 32 F is outside the precision compensation range a MITSUBISHI 7 22 FX2N 2LC Temperature Control Block Buffer Memory BFM 7 7 2 34 BFM 72 to BFM 75 Alarm mode setting The FX2n 2LC is equipped with 14 types of alarms Among them up to 4 types can be used in accordance with the application Write the alarm No used in Alarm 1 to BFM 72 Write the alarm No used in Alarm 2 to BFM 73 Write the alarm No used in Alarm 3 to BFM 74 Write the alarm No used in Alarm 4 to BFM 75 The alarm modes set here are applied to both channels However the set value of each alarm can be set for each channel and the alarm result can be obtained for each channel also CH1 set value BFM 13 to BFM 16 CH2 set value BFM 22 to BFM 25 CH1 alarm result BFM 1 b4 to b8 CH2 alarm result BFM 2 b4 to b8 Or a same alarm type can be set to two or more BFM Nos The initial value is O alarm function OFF For the details refer to Section 6
12. Cold contact temperature nS E compensation kis However within 2 0 C while input value is 150 to 100 a P C within 3 0 C while input value is 200 to 150 C inpu 5 0 1 C 0 1 F or 1 C 1 F Resolution y Varies depending on input range of used sensors Sampling period 500 mS Effect of external asistanca Approx 0 35 uV Q Input impedance 1MQ or more Sensor current Approx 0 3 mA Allowable input lead wire 10 9 or less resistance Operation when input is disconnected Upscale Operation when input is Downscale short circuited Number of input points 2 points Guranrdeisetor CTL 12 S36 8 or CTL 6 P H manufactured by U R D Co Ltd Heater When CTL 12 lo 012 100 0 A current is used CT input measured When CTL 6 is ah value used we ae Larger one between 5 of input value and 2 A Measurement precision Ev excluding precision of current detector Sampling period 1 second a MITSUBISHI 3 3 FX2N 2LC Temperature Control Block Specifications 3 3 5 Input range Table 3 5 Sensor type K J R Ss 200 d40 200 056 7000 to 200 09 100 0 to 400 0 C 100 0 to 400 0 C KN 10010 1300 C 100 010 800 0 C 0 to 1700 C 0 to 1700 C Pang 100 to 1200 C 0 to 3200 F 0 to 3200 F 100 to 800 F Addis sano 319088 1690 100 to 2100 F Sensor type E T B
13. In BFM 78 set the number of heater disconnection alarm delays This setting is applied to both CH1 and CH2 If the abnormal status consecutively occurs in the heater current measured value sampling cycle 1 sec by the preset number of times an alarm is issued The allowable set range is from 3 to 255 times BFM 79 Temperature rise completion range setting In BFM 79 set the temperature rise completion range This setting is applied to both CH1 and CH2 Set the temperature range in which the temperature rise completion range is judged based on the temperature set value The actual temperature rise completion range is judged within the range above and below the temperature set value so the range width is twice Set integers from 1 to 10 for temperature C The setting value does not depend on BFM 70 and 71 input type selection Set value SV gt Temperature rise completion range Temperature Te Tr rise completion a MITSUBISHI 7 26 FX2N 2LC Temperature Control Block Buffer Memory BFM 7 7 2 39 BFM 80 Temperature rise completion soak time In BFM 80 set the temperature rise completion soak time This setting is applied to both CH1 and CH2 The temperature rise completion soak time is the period of time after the measured value reaches the temperature rise completion range until the temperature rise completion flag turns ON In order to cope with a case in which the mea
14. TOH KO K 51 K2 K 1 TOH KO K 36 Ki K 1 TOH KO K 55 Ki K 1 TOH KO K 46 Ki K 1 TO B KO K 65 K 1 K 1 TOH KO K47 Ka000 K1 TOH KO K66 K4000 K1 TOH KO K48 K 1000 K1 TO B KO K 67 K 1000 K1 TOH KO K50 K100 Ki TO E KO K69 K100 K 1 Sets 100 0 C as the set value Writes the set values While the PLC is running the set values can be changed using DO and D1 Alarm 1 set value Upper limit deviation 30 0 C Alarm 2 set value Lower limit deviation 30 0 C Operation mode Monitor Temperature alarm Control initial value Control response parameter Medium Normal operation reverse operation Reverse operation initial value Setting limiter upper limit 400 0 C for both channels Setting limiter lower limit 100 0 C for both channels Loop breaking alarm dead zone 10 0 C a MITSUBISHI 8 4 FX2N 2LC Temperature Control Block Program Example 8 M15 m TO E KO K 70 K 1 K 1 Temperat ure control TOH KO K 71 Ki Ki ready flag ToO p KO K 72 K 12 K1 b TOH KO K 73 K 13 Ki T0 KO K 79 K3 Ki TO KO K 81 KO K 1 M8000 HA FROM KO KO K4MO K1 m FROM KO K1 I K4M20 K1 m FROM KO K2 K4M40 K1 m FROM KO K3 D3 K2 m FROM KO K5 D5 K2 m FROM KO K7 D7 K2 FROM KO K82 D82 K1 Input type selection Type K 100 0 to 400 0 C for both channels Alarm mode
15. WING a sasa aab loa ida 4 2 4 2 Crimp OM 4 3 5 INtroduelion h F netions use ae a sonatas vaonwess ashedatns eendua asletiaaieu 5 1 Daly PID COMO nitrato 5 1 5 1 1 Easy PID control with two degrees of freedom uu 2240u4444002nnnnnnnnnnnnnnnnnnnnn 5 1 5 1 2 Overshoot prevention function srs4srnsnennnsnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn 5 2 5 2 TWO POSIION COMTO licita Ai A aan 5 3 5 3 Auto TUNING TUNG OM Gere Ai GD NAKENANG SAE ANANA A N e Ban a aaa 5 4 5 321 AT auto TUNING En AA AAK Rek Ama D a ed 5 4 5 3 2 Conditions for performing and aborting AT uussssseesssnennsnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn ran 5 5 9 93 35 o O A 5 6 54 Auto manual seen ee ten 5 7 5 4 1 Auto mode and manual mode urususssssssnennnnnnnnnannnnannnnnnnnnnnnnnnnnnnnnnnnnnan nn 5 7 5 4 2 Balance less bump less function 444444444040nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnannnnnnnnn 5 7 5 5 Heater disconnection alarm function nnnnnnnnnnnnnnnnnnnnnn nn nsn een nenne 5 8 5 6 Loop breaking alarm function LBA nneennennnennennnennnnnnnnnn nn 5 9 SAAT ae area ae er ae 6 1 a MITSUBISHI vi FX2N 2LC Temperature Control Block Contents 7 Buffer Memory BEM sense en 7 1 7 1 Buffer memory list cinch ass 7 1 7 2 Details of buffer MOMO ar usa ae ah 7 4 7 2 1 BEM 0HFla9 2 222 2 vite sie elemente 7 4 7 2 2 BFM 1 CH1
16. drastically changes Operation output value MV gt Output limiter lower limit Set how many percentages the operation output is to be changed in a second Drastic changes in output caused by power ON change of the set value disturbance etc When the power is turned ON outside the proportional band or when the set value is considerably changed the output does not drastically change but is performed in accordance with the preset inclination When the output change ratio limiter is set to a small value that is when the inclination is small the control response becomes slow and the effect of differential is eliminated While two position control is performed the output change ratio limiter is disabled While the output change ratio limiter is effective proper PID constants may not be obtained during auto tuning It is recommended not to use the output change ratio limiter when auto tuning is used a MITSUBISHI 7 13 FX2N 2LC Temperature Control Block Buffer Memory BFM 7 7 2 23 BFM 40 CH1 and BFM 59 CH2 Sensor correction value setting PV bias In BFM 40 set the sensor correction value of CH1 In BFM 59 set the sensor correction value of CH2 The actual input value is added corrected by the sensor correction value then stored as the measured value BFM 3 BFM 4 Use this correction value to correct the dispersion among sensors and the difference in the measured value PV
17. from those by other instruments The allowable set range is 50 00 Example Condition To correct 2 C in the range span of 400 C At this time the sensor correction value is as follows Sensor correction value 2 C 400 C x 100 0 5 The display value is as follows Display value Measured value PV Sensor correction value Measured value PV Correction value 2 C Display Temperature alo _ set value SV Actual measured value Time a MITSUBISHI 7 14 FX2N 2LC Temperature Control Block Buffer Memory BFM 7 7 2 24 7 2 25 BFM 41 CH1 and BFM 60 CH2 Adjustment sensitivity dead zone setting In BFM 41 set the adjustment sensitivity dead zone of CH1 In BFM 60 set the adjustment sensitivity dead zone of CH2 By setting the adjustment sensitivity repetitious turning ON OFF of the output around the temperature set value SV can be prevented while two position control is performed The value set to BFM 41 60 is equally given to the upper portion and the lower portion of the temperature set value BFM 12 21 For example if the adjustment sensitivity value is set to 10 5 above the temperature set value and 5 below the temperature set value are treated as the dead zone width of 10 in total The allowable set range is from 0 0 to 10 0 Example Condition When BFM 41 60 is set to 10 0 in the range span of 400 C 400 C x 10 0 100 40 C When the temper
18. of improvement the comments of the Mitsubishi users are always welcomed This page has been designed for you the reader to fill in your comments and fax them back to us We look forward to hearing from you Fax numbers Your name uunseenseenseennennnennnennennnnnnnnnnnn Mitsubishi Electric DEE aana a a ea aa aa ga ea aa pena a E ea wa b tp aia ag ia a eag ane America 01 847 478 2253 Your COMPANY saa aaa ang EN Australia O2 638 7072 ie didas Germany 0 21 02 4 86 1 12 A tkecias cet a aie Spain 84 93 589 1579 mimica diia United Kingdom 01707 278 695 Please tick the box of your choice What condition did the manual arrive in lGood Minor damage HUnusable Will you be using a folder to store the manual Yes LINo What do you think to the manual presentation Tidy OUnfriendly Are the explanations understandable OYes LINot too bad lUnusable Which explanation was most difficult to understand 2444nnsnnneennennennnnnnnnnnnnnn nn Are there any diagrams which are not clear DYes LINo If SO WIIG a neun TE ehe What do you think to the manual layout Good Not too bad Unhelpful If there one thing you would like to see improved what is it uususnnnnnsnennnnnnnnnnnn nennen Could you find the information you required easily using the index and or the contents if possible please identify your KperienCe _ aa aaa anaa eaaa eaaa aana a anana eaaa aana anana anana nana n anana a
19. 69 set the loop breaking alarm dead zone of CH2 une 7 21 7 2 33 BFM 70 CH1 and BFM 71 CH2 Input type selection een 7 22 7 2 34 BFM 72 to BFM 75 Alarm mode setting oooooococcnnnoccconinncccccncnnncncnnn nana nenen naen 7 23 7 2 35 BFM 76 Alarm 1 2 3 4 dead zone setting seeaaee eaaa anan an eaaa aana nane a nana nene 7 25 7 2 36 BFM 77 Number of times of alarm 1 2 3 4 delay sasesaneea anaa nennen 7 26 7 2 37 BFM 78 Number of times of heater disconnection alarm delay u 7 26 7 2 38 BFM 79 Temperature rise completion range setting 44444Hn nennen nennen 7 26 7 2 39 BFM 80 Temperature rise completion Soak time uuusrmnnnnennnnnnnnennennnnnen 7 27 7 2 40 BFM 81 CT monitor method changeover cccccceeeeeeeseeeeeeeeeeeeseeeeeeeeeeseaeeesenees 7 27 7 2 41 BFM 82 Set value range error address 24444440nnnnnnnnnnnnnnnnnnnnnnnnnnannnnnnnnnnnn 7 27 7 2 42 BFM 83 Set value backup command 0aaaaeaaae aaa aaa aane a nean a nean ena nana anane 7 28 8 Program IEXANMDIC el ado 8 1 8 l Programmer ampli causes act ie fie 8 2 DIA AOS ao aio Ll 9 1 a MITSUBISHI viii FX2N 2LC Temperature Control Block Introduction 1 1 Introduction 2 Product Configuration 3 Specifications 4 Wiring 5 Introduction of Functions 6
20. 9 7 2 18 BFM 34 CH1 and BFM 53 CH2 Integral time I 7 10 7 2 19 BFM 35 CH1 and BFM 54 CH2 Derivative time D en 7 10 7 2 20 BFM 36 CH1 and BFM 55 CH2 Control response parameter 7 11 7 2 21 BFM 37 CH1 and BFM 56 CH2 Output limiter upper limit BFM 38 CH1 and BFM 57 CH2 Output limiter lower limit 7 12 7 2 22 BFM 39 CH1 and BFM 58 CH2 Output change ratio limiter 7 13 7 2 23 BFM 40 CH1 and BFM 59 CH2 Sensor correction value setting PV bias 7 14 7 2 24 BFM 41 CH1 and BFM 60 CH2 Adjustment sensitivity dead zone setting 7 15 7 2 25 BFM 42 CH1 and BFM 61 CH2 Control output cycle setting 7 15 7 2 26 BFM 43 CH1 and BFM 62 CH2 Primary delay digital filter setting 7 16 7 2 27 BFM 44 CH1 and BFM 63 CH2 Setting change ratio limiter 7 17 7 2 28 BFM 45 CH1 and BFM 64 CH2 AT auto tuning bias 7 18 7 2 29 BFM 46 CH1 and BFM 65 CH2 Normal reverse operation selection 7 18 7 2 30 BFM 47 CH1 and BFM 66 CH2 Setting the upper limit BFM 48 CH1 and BFM 67 CH2 Setting the lower limit en 7 19 7 2 31 BFM 49 CH1 and BFM 68 CH2 Loop breaking alarm judgement time 7 20 7 2 32 In BFM 50 set the loop breaking alarm dead zone of CH1 In BFM
21. Alarm set value gt Non alarm status Alarm status Alarm status Upper lower limit deviation alarm Measured value PV Measured value PV Pr Alarm set gt value Temperature set value SV Alarm set value gt Alarm status Non alarm status Alarm status a MITSUBISHI 7 25 FX2N 2LC Temperature Control Block Buffer Memory BFM 7 7 2 36 7 2 37 7 2 38 BFM 77 Number of times of alarm 1 2 3 4 delay In BFM 77 set the number of alarm delays This setting is applied to all alarms 1 to 4 The alarm delay function keeps the non alarm status until the number of input samples exceeds the number of alarm delays after the deviation between the measured value PV and the set value SV reaches the alarm set value If the deviation remains in the alarm range until the number of input samples exceeds the number of alarm delays an alarm is issued The allowable set range is from O to 255 times input sampling cycle 500 ms Example When the number of alarm delays is set to 5 times Measured value PV Measured value gee PV Alarm set value gt Temperature p set value SV Input sampling lt P gt 3 times 5 times Alarm status Non alarm status Alarm status BFM 78 Number of times of heater disconnection alarm delay
22. N 200 0 to 200 0 C an 200 0 to 400 0 C EN RE er ee C 0 010 400 0 C 0 to 1800 C 0 to 1300 C ed ote 1800 E 300 0 to 400 0 F Oto 3000 F 0 to 2300 F 300 0 to 700 0 F 0 0 to 700 0 F Sensor type PL Il WRe5 26 U L TRETEN 0 to 1200 C 0102300 C 200 0 to 600 0 C 0 010 900 0 C punang 0 to 2300 F 0103000 F 300 0to 700 0 F O to 1600 F Sensor type JPt100 Pt100 Input range 50 0 to 150 0 C 200 0 to 500 0 C 300 0 to 300 0 F 300 to 900 F 50 0 to 150 0 C 200 0 to 600 0 C 300 0 to 300 0 F 300 to 1100 F e When Bis used 0 to 399 C 0 to 799 F is outside the precision compensation range e When PLII is used O to 32 F is outside the precision compensation range When WRe5 26 is used O to 32 F is outside the precision compensation range a MITSUBISHI 3 4 FX2N 2LC Temperature Control Block Specifications 3 3 6 Output specifications Table 3 6 Item Description Number of output points 2 points Output method NPN open collector transistor output Rated load voltage 5 to 24 VDC Maximum load voltage 30 VDC or less Maximum load current 100 mA Leak current in OFF status 0 1 mA or less Maximum voltage drop in ON status 2 5 V maximum or 1 0 V typical at 100 mA Control output cycle 30 seconds Variable within range from 1 to 100 seconds
23. following cases 1 When the heater current does not flow Caused by heater disconnection error in operating machine etc When the reference heater current value is equivalent to or less than the current set value for the heater disconnection alarm while the control output is ON an alarm is issued However if the control output ON time is 0 5 sec or less heater disconnection alarm func tion is not issued 2 When the heater current does not turn OFF Caused by a molten relay etc When the reference heater current value is more than the current set value for the heater disconnection alarm while the control output is OFF an alarm is issued However if the control output OFF time is 0 5 sec or less heater disconnection alarm func tion is not issued e The current set value for the heater disconnection alarm should be set below the actual current value of the heater Current detector CTL 12 S36 8 Applicable current range 0 0 to 100 0 A CTL 6 P H Applicable current range 0 0 to 30 0 A Manufacturer U R D Co Ltd a MITSUBISHI 5 8 FX2N 2LC Temperature Control Block Introduction of Functions 5 5 6 Loop breaking alarm function LBA The loop breaking alarm function starts to detect the variation ofthe measured value PV at every loop breaking alarm judgment time when the output becomes more than 100 or the output limiter upper limit or less than 0 or the output limiter lower limit then sets to ON the
24. loop breaking alarm CH1 BFM 1 b8 CH2 BFM 2 b8 when judging that there is an abnormality in the control loop Abnormality judgment criteria Table 5 2 Heating control reverse operation When output is less than 0 or When measured value PV does not decrease at least by loop bak sa breaking change criteria 2 C within loop breaking set time an output limiter lower limit pe alarm is issued When output is more than 100 When measured value PV does not increase at least by loop aoe ea breaking change criteria 2 C within loop breaking set time an or output limiter upper limit Be alarm is issued Table 5 3 Cooling control normal operation ES When measured value PV does not decrease at leas by loop When output is less than 0 or eae 5 ee Pia Se breaking change criteria 2 C within loop breaking set time an output limiter lower limit e alarm is issued When outputis more than 100 When measured value hy does not increase at least by loop SEN Pid breaking change criteria 2 C within loop breaking set time an or output limiter upper limit SR alarm is issued Abnormality targets 1 Abnormality in control target Heater disconnection lack of power supply wiring mistake etc 2 3 4 5 Abnormality in sensor Sensor disconnection short circuit etc Abnormality in operating machine Molten relay wiring mistake etc Abnormality in output circuit
25. never perform common grounding with a strong power system a MITSUBISHI 4 1 FX2N 2LC Temperature Control Block Wiring 4 4 1 Wiring When a temperature sensor is a thermocouple TC AC power supply re FX2n 2LC gt SSR SSR CT PTA e FG Shielded cable LAMA IN ee Heater APT Thermocoupl gt PTB TC CT T CT g PTA e FG Shielded cable O PTB TC 5 neater E os E When a temperature sensor is a resistance thermometer bulb RTD Resistance FX2N 2LC thermometer Shielded cable PuIb PTAle 4 FG PTB TC Pie 1 Connect the terminal in the FX2n 2LC to the terminal in the PLC to which Class 3 grounding is performed When using a thermocouple use specified compensating lead wires When using a resistance thermometer bulb use the three wire type and perform wiring with lead wires having small resistance and no difference in the resistance among the three wires e Terminal tightening torque 0 5 to 0 8 N m a MITSUBISHI 4 2 FX2N 2LC Temperature Control Block Wiring 4 4 2 Crimp terminal When connecting one wire to a terminal screw use a crimp terminal of the following dimension and crimp it as shown in the diagram 3 2 0 13 3 2 0
26. or modification may cause failure malfunction or fire For repair contact Mitsubishi Electric System Service Turn OFF the power before connecting or disconnecting a connection cable such as extension cable If you connect or disconnect a connection cable while the power is supplied failure or malfunction may be caused a MITSUBISHI 8 1 FX2N 2LC Temperature Control Block Program Example 8 8 1 Program example This paragraph introduces an example of program to operate the FX2n 2LC Condition Input range Model K 100 0 to 400 0 C PID values Set by auto tuning Alarm Upper limit deviation alarm with re wait and lower limit deviation alarm with re wait Alarm dead zone 1 initial value Control response Medium Operation mode Monitor Temperature alarm Control initial value Control output cycle 30 sec initial value Normal reverse Reverse operation initial value operation Loop breaking 480 sec initial value alarm judgement time Temperature rise 3 C completion range CT monitor method ON current OFF current initial value The control output cycle output limiter output change ratio limiter loop breaking alarm judgement time alarm dead zone heater disconnection alarm sensor correction value adjustment sensitivity dead zone primary delay digital filter setting change ratio limiter auto tuning bias setting limiter and the temperature rise completion soak time are no
27. or when a b2 A compensation data error failure has occurred in FX2n 2LC If contents of error are not eliminated even after power is turned b3 A D converted value error OFF once then ON again contact Mitsubishi Electric System Service b4 Alarm 1 Turns ON when an alarm has occurred b5 Alarm 2 Turns ON when an alarm has occurred b6 Alarm 3 Turns ON when an alarm has occurred b7 Alarm 4 Turns ON when an alarm has occurred b8 Loop breaking alarm Turns ON when a loop breaking alarm has occurred b9 ian disconnection Turns ON when a heater disconnection alarm has occurred b10 Heater meltdown alarm Turns ON when a heater meltdown alarm has occurred When an error above has occurred the contents described in the corresponding Description column may be causes Eliminate causes of errors then reset all errors using BFM 10 If causes of an error remain the corresponding bit turns ON again a MITSUBISHI 9 1 FX2N 2LC Temperature Control Block Diagnostic 9 Other causes of errors In addition to the flags and the events the following situation may be realized 1 The FX2n 2LC does not operate with the set values written by TO instructions Check whether or not the FX2n 2LC is correctly connected to the PLC Check the connector positions and the connection status Check whether or not the unit No and the BFM Nos are correctly specified in FROM TO instructions 2 The POWER LED is not lit
28. perform PID output control Connect the FX2n 2LC to the FX1n FX2n FX2Nc FX3u FX3uc Series PLC 1 As input sensors two thermocouples two platinum resistance thermometer bulbs or one thermocouple and one platinum resistance thermometer bulb are available 2 Data can be written and read using FROM TO instructions when the FX2n 2LC is connected to the FX1n FX2N FX2NC FX3u FX3uc Series PLC The FX2n 2LC performs arithmetic operation for PID control and output control You do not have to create sequence programs for PID operation 3 Disconnection of heaters can be detected by current detection CT 4 The proportional band the integral time and the derivative time can be easily set by auto tuning 5 Channels are isolated against each other a MITSUBISHI 1 2 FX2N 2LC Temperature Control Block Product Configuration 2 1 Introduction 2 Product Configuration 3 Specifications 4 Wiring 5 Introduction of Functions 6 Alarm 7 Buffer Memory BFM 8 Program Example 9 Diagnostic a MITSUBISHI FX2N 2LC Temperature Control Block Product Configuration 2 a MITSUBISHI FX2N 2LC Temperature Control Block Product Configuration 2 2 Product Configuration 2 1 Outside dimension 240 16 Mounting hole Connector for next step extension cable 80 3 15 0 5 0 02 mount
29. setting Upper limit deviation alarm with re wait Alarm mode setting Lower limit deviation alarm with re wait Temperature rise completion range 3 C CT monitor method ON current OFF current initial value Flag BFM 0 gt MO to M15 Event CH1 BFM 1 gt M20 to M35 Event CH2 BFM 2 gt M40 to M55 Temperature measured value PV BFM 3 CH1 gt D3 BFM 4 CH2 gt D4 Control output value MV BFM 5 CH1 gt D5 BFM 6 CH2 gt D6 Heater current measured value BFM 7 CH1 gt D7 BFM 8 CH2 gt D8 Set value range error address BFM 82 gt D82 a MITSUBISHI 8 5 FX2N 2LC Temperature Control Block Program Example 8 X000 Disables TO KO K9 KO K 1 initialization X000 HJ Ke Performs TO m KO K9 K 1 K 1 initialization X001 Disables error TO KO K 10 KO K 1 reset X001 Performs error TO HE KO K 10 K 1 K 1 reset X002 Stops control TO KO K 11 KO K 1 X002 Starts control TO KO K 11 K 1 K 1 M15 Temperat TO KO K 18 KO K 1 ure control ready flag TO KO K 27 KO K 1 M34 Auto tuning is TO KO K 20 KO K 1 being performed CH1 M54 Auto tuning is TO KO K 29 KO K 1 being performed CH2
30. when an error has been caused by noise or when a failure has occurred in FX2N 2LC b3 Set value backup error If contents of error are not eliminated even after power is turned OFF once then ON again contact Mitsubishi Electric System Service b4 Unused b5 Unused AT abnormal end flag CH1 b6 Applicable to Ver 1 22 or later Each bit turns ON when AT abnormally ends The alarm can be reset by set a value of 0 to the AT pz JAT abnormal end flag CH2 execution command See Ch 5 3 Applicable to Ver 1 22 or later bg Sum check error for adjustment Turns ON when an error has been caused by noise or when data error a failure has occurred in FX2N 2LC b9 Cold contact temperature If contents of error are not eliminated even after power is compensation data error turned OFF once then ON again contact Mitsubishi Electric b10 A D converted value error System Service b11 Unused b12 Controlling flag Turns ON when FX2N 2LC is performing control Remains ON while set values are being backed up b13 Set value being backed up Refer to 7 2 42 b14 Unused b15 Temperature control ready flag Turns ON when FX2N 2LC becomes ready for operation Operation of b15 Temperature control ready flag Temperature control ready flag nga ag Power is turned ON Temperature control CPU It takes 500 ms ready for operation maximum Description on o
31. which can be recognized by the FX2n 2LC Table 9 1 Flags BFM 0 indicating errors Bit No Description Operation bO Error present Turns ON when an error among b1 to b10 below has occurred b1 Set value range error Turns ON when data outside set range is written b2 24 VDC power supply error Turns ON when driving power supply 24 VDC is not supplied b3 Set value backup error Turns ON when an error has been caused by noise or when a failure has occurred in FX2n 2LC If contents of error are not eliminated even after power is turned OFF once then ON again contact Mitsubishi Electric System Service b8 Sum check error for adjustment data error b9 Cold contact temperature compensation data error b10 A D converted value error Turns ON when an error has been caused by noise or when a failure has occurred in FX2n 2LC If contents of error are not eliminated even after power is turned OFF once then ON again contact Mitsubishi Electric System Service Events BFM 1 and BFM 2 indicating errors Table 9 2 Events BFM 1 and BFM 2 indicating errors Bit No Assignment Description bO Input error upper limit Turns ON when input value is over scale b1 Input error lower limit Turns ON when input value is under scale Cold contact temperature Turns ON when an error has been caused by noise
32. 13 Terminal screw Crimp terminal LA E Terminal When connecting two wires to a terminal screw use crimp terminals of the following dimension and crimp them as shown in the diagram YN YN So 1 kin o 3 2 0 13 lt 6 3mm 0 25 or more 3 2 0 13 lt 6 3mm 0 25 or more Terminal screw Crimp terminal Br NUS Terminal a MITSUBISHI FX2N 2LC Temperature Control Block Wiring 4 MEMO a MITSUBISHI 4 4 FX2N 2LC Temperature Control Block Introduction of Functions 5 1 Introduction 2 Product Configuration 3 Specifications 4 Wiring 5 Introduction of Functions 6 Alarm 7 Buffer Memory BFM 8 Program Example 9 Diagnostic a MITSUBISHI FX2N 2LC Temperature Control Block Introduction of Functions 5 a MITSUBISHI FX2N 2LC Temperature Control Block Introduction of Functions 5 5 Introduction of Functions This section introduces the functions of the FX2n 2LC For setting of each function refer to the description on buffer memories BFM later 5 1 PID control 5 1 1 Easy PID control with two degrees of freedom PID control is a control method to obtain stable control result by setting each of the constants P proportional band I integral time and D derivative time However if each PID constant is so set that the resp
33. 8 CH2 BFM 66 and BFM 67 is set the allowable set range corresponds to the setting limiter BFM 13 to BFM 16 CH1 and BFM 22 to BFM 25 CH2 Alarm 1 2 3 4 set value In BFM 13 to BFM 16 and BFM 22 to BFM 25 write the set value of each alarm selected by the alarm 1 2 3 4 mode setting BFM 72 to BFM 75 In the alarm 1 2 3 4 mode setting four among 14 alarm types can be arbitrarily selected BFM 13 to BFM 16 CH1 and BFM 22 to BFM 25 CH2 are assigned to the alarm 1 mode the alarm 2 mode the alarm 3 mode and the alarm 4 mode respectively in the ascending order of BFM No for each channel The unit and the allowable range of the set value written to BFM 13 to BFM 16 CH1 and BFM 22 to BFM 25 CH2 vary depending on the selected alarm mode In accordance with the setting of the alarm mode setting BFM 72 to BFM 75 write a proper set value BFM 17 CH1 and BFM 26 CH2 Heater disconnection alarm set value In BFM 17 set a value to recognize heater disconnection in CH1 In BFM 26 set a value to recognize heater disconnection in CH2 Depending on the output ON OFF status the heater s current value for each channel input from the CT and the value set for BFM 17 CH1 or BFM 26 CH2 thus heater disconnection alarm CH1 BFM 1 b9 CH2 BFM 2 b9 turns ON The display range is from 0 0 to 100 0 A When BFM 17 26 is set to 0 0 the heater disconnection alarm function is disabled The current set valu
34. 8 and BFM 57 set the output limiter lower limit of CH1 and CH2 respectively Use these BFMs when setting the upper limit and the lower limit for the setting of the control output value MV BFM 5 BFM 6 The allowable set range of the upper limit is from the output limiter lower limit to 105 The allowable set range of the lower limit is from 5 0 to the output limiter upper limit Output limiter upper limit Output limiter lower limit While the output limiter is effective proper PID constants may not be obtained during auto tuning It is recommended not to use the output limiter when auto tuning is used While two position control is used the output limiter is not effective a MITSUBISHI 7 12 FX2N 2LC Temperature Control Block Buffer Memory BFM 7 7 2 22 BFM 39 CH1 and BFM 58 CH2 Output change ratio limiter In BFM 39 set the output change ratio limiter of CH1 In BFM 58 set the output change ratio limiter of CH2 The output change ratio limiter function limits the variation of the control output value MV per unit time 1 sec The output is limited in accordance with the preset output change ratio The allowable set range is from 0 to 100 When BFM 39 58 is set to 0 0 the output change ratio limiter function is disabled When the output change ratio limiter is not used Output limiter upper limit Operation output value gt MV 0 1 to Output 100 0
35. Alarm 7 Buffer Memory BFM 8 Program Example 9 Diagnostic a MITSUBISHI FX2N 2LC Temperature Control Block Introduction 1 a MITSUBISHI FX2N 2LC Temperature Control Block Introduction 1 1 Introduction Cautions on design AN e Install a safety circuit outside the PLC or the temperature control block FX2n 2LC so that the entire system conservatively operates even if an abnormality occurs in the external power supply or a failure occurs in the PLC or the FX2n 2LC If a safety circuit is installed inside the PLC malfunction and erroneous output may cause accidents 1 Make sure to construct an emergency stop circuit protection circuit or interlock circuit to prevent damages of a machine etc outside the PLC or the FX2n 2LC 2 Ifthe PLC or the FX2n 2LC detects an abnormality such as a watch dog timer error or input value error by the self diagnosis function or when an abnormality occurs in the I O control area etc which cannot be detected by the CPU in the PLC output control may be disabled Design external circuits and structure so that the entire system conservatively operates in such cases e If a failure occurs in a relay transistor TRIAC etc in an output unit of the FX2n 2LC or the PLC outputs may keep ON or OFF For output signals which may lead to severe accidents design external circuits and structure so that the entire system conservatively operates Cautions on installation A
36. Changes for the Better e MITSUBISHI PROGRAMMABLE CONTROLLERS EISEG FX2N 2LC Temperature Control Block Foreword This manual contains text diagrams and explanations which will guide the reader in the cor rect installation and operation of the communication facilities of FX series Before attempting to install or use the communication facilities of FX series this manual should be read and understood If in doubt at any stage of the installation of the communication facilities of FX series always consult a professional electrical engineer who is qualified and trained to the local and national standards which apply to the installation site If in doubt about the operation or use of the communication facilities of FX series please consult the nearest Mitsubishi Electric distributor This manual is subject to change without notice a MITSUBISHI FX2N 2LC Tempereture Control Block FX2n 2LC Temperature Control Block USER S MANUAL Manual number JY992D85801 Manual revision E Date 9 2007 a MITSUBISHI FX2N 2LC Tempereture Control Block a MITSUBISHI FX2N 2LC Tempereture Control Block FAX BACK Mitsubishi has a world wide reputation for its efforts in continually developing and pushing back the frontiers of industrial automation What is sometimes overlooked by the user is the care and attention to detail that is taken with the documentation However to continue this process
37. Control Block Specifications 3 3 Specifications 3 1 General specifications Table 3 1 Item Specifications Withstand voltage Era for 1 minute between analog input terminal and grounding Other general specifications are equivalent to those for the PLC main unit Refer to the man 3 ual of the PLC main unit 3 2 Power supply specifications Table 3 2 Item Specifications Driving power supply 24 VDC 15 to 10 input from driving power supply terminal raue supply tor 5 VDC supplied from inside of PLC main unit communication Current consumption 24 VDC 55 mA and 5 VDC 70 mA Analog input area and PLC are insulated by photocoupler Insulation method Power supply and analog input are insulated by DC DC converter Channels are insulated each other Kell otoceupied WO 8 points in total including input points and output points a MITSUBISHI 3 1 FX2N 2LC Temperature Control Block Specifications 3 3 3 Performance specifications Table 3 3 Item Description Control method Two position control PID control with auto tuning function Pl control Control operation period 500 ms Set temperature range Equivalent to input range Refer to 7 2 33 Alarm is detected in accordance with setting of buffer memory Variable within range from 0 0 to 100 0 A 0 Measured value monitor 1 Measured value monitor Temperature alarm
38. D parameters is out of the set range Proportional band 0 1 to 1000 0 Integral time 1 to 3600 Derivative time 0 to 3600 The AT execution command BFM 20 29 is set to 0 Stops auto tuning AT abnormal end flag does not turn ON Power failure occurs AT abnormal flag does not turn ON a MITSUBISHI 5 5 FX2N 2LC Temperature Control Block Introduction of Functions 5 5 33 AT bias Set the AT bias to perform auto tuning in which the measured value PV should not exceed the temperature set value SV The auto tuning function performs two position control using the temperature set value SV hunts the measured value PV then calculates and sets each PID constant However for some control targets overshoot caused by hunting is not desirable Set the AT bias for sucha case When the AT bias is set the set value SV AT point with which auto tuning is performed can be changed Measured value PV Example When the AT bias is set to Temperature set value SV AT bias AT point gt AT starts AT finishes a MITSUBISHI 5 6 FX2N 2LC Temperature Control Block Introduction of Functions 5 5 4 5 4 1 5 4 2 Auto manual Auto mode and manual mode The mode can be changed over between auto and manual In the auto mode the control output value MV is set to the output quantity automatically calculated in accordance with the temperature set value SV In the manual mode th
39. FM 81 BFM 82 Set value range error address When an out of range error occurs in the set value written to each BFM BFM 82 indicates the BFM No in which the error occurs While no error occurs BFM 82 stores 0 When an error occurs BFM 82 stores the BFM No in which the error occurs Check the set range set a proper value for the corresponding BFM then reset the error BFM 10 a MITSUBISHI 7 27 FX2N 2LC Temperature Control Block Buffer Memory BFM 7 7 2 42 BFM 83 Set value backup command BFM 83 writes the values set to BFM 12 to BFM 29 and BFM 32 to BFM 81 to the EEPROM built in the FX2n 2LC When the power is turned ON the FX2n 2LC transfers the data stored in the EEPROM to the buffer memories and use the data as the set values for temperature control When the set values are backed up written to the EEPROM once BFM 12 to BFM 29 and BFM 32 to BFM 81 do not have to be set atthe nexttime and later As a result as soon as control starts BFM 11 temperature control is enabled At the time of shipment the EEPROM stores the initial values Set value backup command Set values are being backed up Set value backup error Description on operation 1 When the set value backup command turns on the FX2n 2LC turns on the set value backup flag 2 When backup of the set values is completed the set value backup flag turns off When this flag turns off turn off the set value backup comman
40. Molten relay inside instrument etc gt o Abnormality in input circuit No change in the measured value PV even after input has changed Note When the auto tuning function is used the LBA set time is automatically set to the integral time result multiplied by 2 The LBA set time does not change even if the integral value changes While auto tuning is performed the loop breaking alarm function is disabled If the LBA set time is too short or is not suitable to control targets the loop breaking alarm may repeatedly turn on and off or may not turn ON In such a case change the LBA set time in accordance with the situation The loop breaking alarm function judges abnormalities in the control loop but cannot detect positions in which abnormalities occur Check each part of the control system in turn a MITSUBISHI 5 9 FX2N 2LC Temperature Control Block Introduction of Functions 5 MEMO a MITSUBISHI 5 10 FX2N 2LC Temperature Control Block Alarm 6 1 Introduction 2 Product Configuration 3 Specifications 4 Wiring 5 Introduction of Functions 6 Alarm 7 Buffer Memory BFM 8 Program Example 9 Diagnostic a MITSUBISHI FX2N 2LC Temperature Control Block Alarm 6 a MITSUBISHI FX2N 2LC Temperature Control Block Alarm 6 6 Alarm The FX2n 2LC is equipped with 14 types of alarms Among them up to 4
41. Use the unit in the environment for the general specifications described in the manual Never use the unit in a place with dusts soot conductive dusts corrosive gas or flammable gas place exposed to high temperature dew condensation or rain and wind or place exposed to vibration or impact If the unit is used in such a place electrical shock fire malfunction damages in the unit or deterioration of the unit may be caused e Never drop cutting chips or electric wire chips into the ventilation window of the FX2n 2LC while drilling screw holes or wiring cables Such chips may cause fire failure or malfunction e After finishing installation remove a dust preventing sheet adhered on the ventilation window of the PLC and the FX2n 2LC If the sheet remains attached fire failure or malfunction may be caused e Securely connect cables such as extension cables and memory cassettes to specified connectors Imperfect contact may cause malfunction Caution on disposal A e When disposing of the unit treat it as industrial waste a MITSUBISHI 1 1 FX2N 2LC Temperature Control Block Introduction 1 1 1 Outline of product The temperature control block FX2n 2LC hereafter referred to as temperature control block or FX2n 2LC equipped with two temperature input points and two transistor open collector output points is a special block to read temperature signals from thermocouples and platinum resistance thermometer bulbs and
42. V siibut 6 Range alarm Set value SV is less than alarm set value an an alarm is issued nen When measured value PV is more than alarm set Upper limit input value alarm ANS Input 7 d N value an alarm is issued However when power is with wait ee range turned ON measured value is ignored o When measured value PV is less than alarm set Lower limit input value alarm ne 4 Input 8 q j value an alarm is issued However when power is with wait Ae range turned ON measured value is ignored When deviation Measured value PV Set 9 Upper limit deviation value value SV is more than alarm set value an alarm Input alarm with wait is issued However when power is turned ON width measured value is ignored When deviation Measured value PV Set 10 Lower limit deviation value value SV is less than alarm set value an alarm Input alarm with wait is issued However when power is turned ON width measured value ignored When absolute deviation Measured value PV 41 Upper lower limit deviation Set value SV is more than alarm set value an Input value alarm with wait alarm is issued However when power is turned width ON measured value is ignored a MITSUBISHI 6 1 FX2N 2LC Temperature Control Block Alarm 6 Table 6 1 Alarm ae Set No Alarm type Description range When deviation Measured value PV Set ret ae value SV is more than alarm set va
43. abnormalities occur Check each part of the control system in turn a MITSUBISHI 7 20 FX2N 2LC Temperature Control Block Buffer Memory BFM 7 7 2 32 In BFM 50 set the loop breaking alarm dead zone of CH1 In BFM 69 set the loop breaking alarm dead zone of CH2 The loop breaking alarm function may issue alarms caused by disturbances effect of another heat source etc even if there is no abnormality in the control system In order to prevent such alarms by setting the loop breaking alarm dead zone the region in which the alarm function is disabled non alarm status region can be set For example if the loop breaking alarm dead zone is set to 10 C 10 C above the set value SV and 10 C below the set value SV are treated as the non alarm status region width of 20 C in total While the measured value PV is located within the non alarm region alarm is not issued even if the alarm condition is satisfied The allowable set range is form 0 0 or 0 to the input range span C or F When BFM 50 69 is set to 0 the loop breaking alarm dead zone function is disabled LBD operation gap a Non alarm status region 3 gt LBD operation gap 3 A AAA Alarm status region 4 Alarm status region Low Temperature set value SV LBD set value High 1 While the temperature is rising Alarm status region While the temperature is decreasing Non alarm status region 2 While the tempe
44. ak time BFM 80 is finished b15 of the event BFM 1 BFM 2 turns ON a MITSUBISHI 76 FX2N 2LC Temperature Control Block Buffer Memory BFM 7 7 2 3 7 2 4 7 2 5 7 2 6 7 2 7 7 2 8 BFM 3 CH1 and BFM 4 CH2 Measured value PV BFM 3 stores the measured value for CH1 BFM 4 stores the measured value for CH2 The units are C 0 1 C F or 0 1 F in accordance with the setting of the input type selection BFM 70 BFM 71 When the power is turned ON the measured value is stored in each of the mentioned BFMs after nine seconds of sampling time BFM 5 CH1 and BFM 6 CH2 Control output value MV BFM 5 stores the control output value output ON ratio of CH1 BFM 6 stores the control output value output ON ratio of CH2 The display range is from 5 0 to 105 0 BFM 7 CH1 and BFM 8 CH2 Heater current measured value BFM 7 stores the heater current measured value of CH1 input from CT BFM 8 stores the heater current measured value of CH2 input from CT The display range is from 0 0 to 105 0 A BFM 9 Initialization command In BFM 9 initialize the set values When BFM 9 is set to KO initial value the initialization command is disabled When BFM 9 is set to K1 addresses 10 to 81 are set to the initial values When BFM 9 is set to K2 addresses 10 to 69 are set to the initial values When BFM 9 is set to K1 or K2 initialization is completed and BFM 9 retai
45. alarm set value an alarm Input alarm with wait is issued However when power is turned ON width measured value is ignored When deviation Measured value PV Set 10 Lower limit deviation value value SV is less than alarm set value an alarm Input alarm with wait is issued However when power is turned ON width measured value ignored a MITSUBISHI 7 23 FX2N 2LC Temperature Control Block Buffer Memory BFM 7 Table 7 8 Alarm ae Set No Alarm type Description range When absolute deviation Measured value PV 41 Upper lower limit deviation Set value SV is more than alarm set value an Input value alarm with wait alarm is issued However when power is turned width ON measured value is ignored When deviation Measured value PV Set value SV is more than alarm set value an alarm 12 Dpper ni Geviallion value is issued However when power is turned ON and input alarm with re wait f width when set value is changed measured value is ignored When deviation Measured value PV Set ae Lag value SV is less than alarm set value an alarm Lower limit deviation value et Input 13 A E is issued However when power is turned ON and A alarm with re wait width when set value is changed measured value is ignored When absolute deviation Measured value PV nae NE Set value SV is more than alarm set value an Upper lower limit deviatio
46. and BFM 2 CH2 Eventi saaaaa eaaa aane a anaa nana na nana a nana aana ene 7 5 7 2 3 BFM 3 CH1 and BFM 4 CH2 Measured value PV nesses 7 7 7 2 4 BFM 5 CH1 and BFM 6 CH2 Control output value MV 7 7 7 2 5 BFM 7 CH1 and BFM 8 CH2 Heater current measured value 7 7 7 2 6 BFM 9 Initialization command 4 444444444Hn nen nnnnennnnnnnnnennnnnnnnnnnnnnnnnnnnnnnnnnnn 7 7 7 2 7 BFM 10 Error reset command saras akak AKA KAB KANG KAKA KEN AK AENG KG ANANA KA NGA A KAN KA AAN ANG 7 7 7 2 8 BFM 11 Control start stop changeover 0sessesen aane aane a nean a aane anana anna 7 7 7 2 9 BFM 12 CH1 and BFM 21 CH2 Set value SV 7 8 7 2 10 BFM 13 to BFM 16 CH1 and BFM 22 to BFM 25 CH2 Alarm 1 2 3 4 Svalbard 7 8 7 2 11 BFM 17 CH1 and BFM 26 CH2 Heater disconnection alarm set value 7 8 7 2 12 BFM 18 CH1 and BFM 27 CH2 Auto manual mode changeover 7 8 7 2 13 BFM 19 CH1 and BFM 28 CH2 Manual output set value 7 9 7 2 14 BFM 20 CH1 and BFM 29 CH2 Auto tuning execution command 7 9 7 2 15 BCM 30 Unit type COB ooooccccocccconcccconccnonncononocannnn cnn nan nana anana anaa amen nan ncnannnncnnns 7 9 7 2 16 BFM 32 CH1 and BFM 51 CH2 Operation mode cooocccinoccccnoccccnocaconancnnnnnnnnns 7 9 7 2 17 BFM 33 CH1 and BFM 52 CH2 Proportional band P 7
47. ative function is disabled a MITSUBISHI 7 10 FX2N 2LC Temperature Control Block Buffer Memory BFM 7 7 2 20 BFM 36 CH1 and BFM 55 CH2 Control response parameter In BFM 36 set the control response parameter of CH1 In BFM 55 set the control response parameter of CH2 The control response parameter selects the response to changes in the temperature set value SV in PID control among three steps slow medium and fast When BFM 36 55 is set to KO the response becomes slow speed When BFM 36 55 is set to K1 the response becomes medium speed When BFM 36 55 is set to K2 the response becomes fast speed The figure below shows the operation at each setting Measured value PV Medium Temperature set value SV 2 Changed Temperature set p value SV 1 Temperature set value SV change point In order to increase the response speed of the control target to changes in the temperature set value SV select fast In this case however a little overshoot cannot be avoided Overshoot is not desirable in some control targets In order to prevent overshoot select slow a MITSUBISHI 7 11 FX2N 2LC Temperature Control Block Buffer Memory BFM 7 7 2 21 BFM 37 CH1 and BFM 56 CH2 Output limiter upper limit BFM 38 CH1 and BFM 57 CH2 Output limiter lower limit In BFM 37 and BFM 56 set the output limiter upper limit of CH1 and CH2 respectively In BFM 3
48. ature set value is 200 C the range from 180 to 220 C is treated as the dead zone Temperature Adjustment sensitivity dead zone The adjustment sensitivity setting is given to both the upper portion set value SV and the lower portion of the temperature set value SV Control output value MV When the adjustment sensitivity dead zone is set to a large value vertical fluctuation becomes large When the adjustment sensitivity is too small small oscillations of the measured value cause chattering BFM 42 CH1 and BFM 61 CH2 Control output cycle setting In BFM 42 set the control output cycle of CH1 In BFM 61 set the control output cycle of CH2 Set the period of time in which the output turns ON and OFF The value set here multiplied by the control output value is treated as the ON time The value set here multiplied by 100 Control output value is treated as the OFF time The allowable set range is from 1 to 100 sec ON OFF Control output Control output cycle a MITSUBISHI 7 15 FX2N 2LC Temperature Control Block Buffer Memory BFM 7 7 2 26 BFM 43 CH1 and BFM 62 CH2 Primary delay digital filter setting In BFM 43 set the primary delay digital filter of CH1 In BFM 62 set the primary delay digital filter of CH2 The FX2n 2LC is equipped with the software input filter so that fluctuation of the measured value PV caused by noise can be redu
49. ced The time constant of this input filter can be set in accordance with the characteristics of the control target and the noise level If the time constant is too small the input filter cannot give required effect If the time constant is too large the input responsibility is deteriorated The allowable set range is from 0 to 100 sec When BFM 43 62 is set to 0 the filter function is disabled While the filter function is disabled data is acquired in the sampling cycle 500 ms Input of actual measured value PV Pulse input caused by noise Input of measured value PV processed by the primary delay digital filter Input amplitude az Amplitude lig processed by the filter I 1 A sa MITSUBISHI 7 16 FX2N 2LC Temperature Control Block Buffer Memory BFM 7 7 2 27 BFM 44 CH1 and BFM 63 CH2 Setting change ratio limiter In BFM 44 set the setting change ratio limiter of CH1 In BFM 63 set the setting change ratio limiter of CH2 The setting change ratio limiter function changes step by step the difference in the temperature set value when the temperature set value is changed Set the variation per minute The allowable set range is from 0 1 to 100 0 When BFM 44 63 is set to 0 the setting change ratio limiter function is disabled and the set value immediately changes Example When the temperature set value 1 SV1 is changed to the temperature set value 2 SV2 W
50. d 3 Ifthe set value backup command turns off while the set values are being backed up the set value backup error turns on In such a case normally back up the set values again If the power is turned off and on while a backup error is present each data is reset to the initial value 4 While a set value range error BFM 0 b1 is present the set values are not backed up a MITSUBISHI 7 28 FX2N 2LC Temperature Control Block Program Example 8 1 Introduction 2 Product Configuration 3 Specifications 4 Wiring 5 Introduction of Functions 6 Alarm 7 Buffer Memory BFM 8 Program Example 9 Diagnostic a MITSUBISHI FX2N 2LC Temperature Control Block Program Example 8 a MITSUBISHI FX2N 2LC Temperature Control Block Program Example 8 8 Program Example Cautions on Startup AN e Never touch any terminal while the power is supplied If you touch a terminal while the power is supplied you may get electrical shock or the unit may malfunction Turn OFF the power before cleaning the unit or tightening the terminals If you clean the unit or tighten the terminals while the power is supplied you may get electrical shock Thoroughly read the manual sufficiently assure safety then perform temperature control An operation mistake may cause damages in the machine or accidents Never disassemble or modify the unit Disassembly
51. e control output value MV is set to the output quantity set arbitrarily and manually Inthe manual mode b13 manual mode transition completion of the event CH1 BFM 1 CH2 BFM 2 becomes 1 to notify the manual mode 0 5 second is required to change over the mode During changeover the balance less bump less function is actuated Auto mode In the auto mode the measured value PV is compared with the temperature set value SV and the control output MV is given by PID arithmetic operation This mode is selected when the FX2n 2LC is shipped In the auto mode the manual output value is always set to the output value MV Manual mode In the manual mode the output MV value is fixed to a certain value By changing the manual output setting BFM 19 BFM 28 the output value can be fixed to an arbitrary value The manual output value can be changed while b13 of the event CH1 BFM 1 CH2 BFM 2 is 1 that is when the manual mode is selected Even in the manual mode the temperature alarm function is effective Balance less bump less function The balance less bump less function prevents overload caused by drastic change in the control output value MV when the mode is changed over from auto to manual or from manual to auto Operation performed when the mode is changed over from auto to manual The control output value in the auto mode continues to be effective Operation performed when the mode is chang
52. e for any consequential damage that may arise as a result of the installation or use of this equipment e All examples and diagrams shown in this manual are intended only as an aid to understanding the text not to guarantee operation Mitsubishi Electric will accept no responsibility for actual use of the product based on these illustrative examples e Please contact a Mitsubishi Electric distributor for more information concerning applications in life critical situations or high reliability a MITSUBISHI vi FX2N 2LC Temperature Control Block Contents Guideline S srta nadas v TAMPOCO a SAS 1 1 1 1 Outline OF Product anne ee 1 2 2 Product GOnligurali nsae euer 2 1 21 Oifside dimensions ee a tcs 2 1 2 2 Namet each Part aduk ag Bj ga E A A a rad 2 1 2 3 A nee ans KA E AE KG ENGGAK aa sak KAG TEN E a ond KR NERSE aina 2 2 2 4 Installation method 5 apa aaa ENE Ra paaa na SE aga pean eg a na 2 3 2 5 Connection to PLC Main Unit aaa eine 2 4 E A A ia pj ied GN IT 3 1 3 1 General specifications sasae eaaa ts ccivnncansacs 3 1 3 2 Power supply Specifications nnnsnnennnennnnnnnnnnnnn nn nn aana aaa 3 1 3 3 Performance Specifications 222224422nnssnneennennnennnennnnnnennnennnnnnnnnnnnn nn 3 2 3 4 Input specifications mini ide 3 3 3 5 INBULTANge een one deine 3 4 3 6 Output spacihcatlons ann 3 5 ATV VIF Cl Sasse center AN MR NK AN EA AN E AN TAN 4 1 4 1
53. e for the heater disconnection alarm should be set below the actual current value of the heater BFM 18 CH1 and BFM 27 CH2 Auto manual mode changeover In BFM 18 change over the mode of CH1 In BFM 27 change over the mode of CH2 When BFM 18 27 is set to KO initial value the auto mode is selected When BFM 18 27 is set to K1 the manual mode is selected Auto mode The measured value PV is compared with the temperature set value SV PID arithmetic operation is performed then the control output MV is given In the auto mode the manual output set value CH1 BFM 19 CH2 BFM 28 is always equivalent to the control output value Manual mode The control output MV value is fixed to the manual output set value CH1 BFM 19 CH2 BFM 28 The manual output set value can be changed while b13 of the event CH1 BFM 1 CH2 BFM 2 is ON even if operation is performed in the manual mode The temperature alarm function is effective even in the manual mode a MITSUBISHI 7 8 FX2N 2LC Temperature Control Block Buffer Memory BFM 7 7 2 13 7 2 14 7 2 15 7 2 16 7 2 17 BFM 19 CH1 and BFM 28 CH2 Manual output set value In BFM 19 CH1 and BFM 28 CH2 set the output ON ratio in the manual mode The display range is from 5 0 to 105 0 The output ON OFF cycle period of time can be set within the range from 1 to 100 sec using BFM 42 CH1 and BFM 61 CH2 Write the percen
54. e setting has been determined by initialization or backup to the EEPROM it is not required to write such setting again a MITSUBISHI 8 6 FX2N 2LC Temperature Control Block Program Example 8 e In this example the status of the flags BFM 0 and the events BFM 1 and BFM 2 can be monitored using auxiliary relays M In order to output such status to the outside use each auxiliary relay as a contact and drive outputs Y MO D Error present is output An error is present M28 OD CH1 loop disconnection alarm is output CH1 loop is disconnected M48 Ye CH2 loop disconnection alarm is output CH2 loop is disconnected a MITSUBISHI 8 7 FX2N 2LC Temperature Control Block Program Example 8 MEMO a MITSUBISHI 8 8 FX2N 2LC Temperature Control Block Troubleshooting 9 1 Introduction 2 Product Configuration 3 Specifications 4 Wiring 5 Introduction of Functions 6 Alarm 7 Buffer Memory BFM 8 Program Example 9 Diagnostic a MITSUBISHI FX2N 2LC Temperature Control Block Troubleshooting 9 a MITSUBISHI FX2N 2LC Temperature Control Block Diagnostic 9 9 Diagnostic By reading the flags BFM 0 and the events BFM 1 and BFM 2 using FROM instructions you can confirm errors such as lack of the driving power supply 24 V heater disconnection and loop breaking
55. ed over from manual to auto The control output value is changed over to a value automatically calculated based on the temperature set value SV Operation output quantity Auto Manual Time The mode is changed over from auto to manual However the operation output quantity follows the operation output quantity in the auto mode The operation output quantity is manually changed The mode is changed over from manual to auto The operation output quantity becomes a value automatically calculated based on the temperature set value SV a MITSUBISHI 5 7 FX2N 2LC Temperature Control Block Introduction of Functions 5 5 5 Heater disconnection alarm function The heater disconnection alarm function detects the current flowing in the load using a current detector CT it compares the detected value heater current measured value with the current value set for heater disconnection alarm and issues an alarm when the measured value is more than or less than the current set value for the heater disconnection alarm The heater current can be measured using buffer memories BFM 7 BFM 8 Connection example Power supply Temperature control block Control output Operating machine SSR FX2N 2LC Current detector d Current detector input Measured Sensor value PV N Control target Alarm operation The heater disconnection alarm function issues an alarm in the
56. etting described above BFM 33 CH1 and BFM 52 CH2 Proportional band P In BFM 33 set the proportional band of CH1 In BFM 52 set the proportional band of CH2 The proportional band is required to give the control output in proportion to the deviation which is the difference between the set value SV and the measured value PV As the proportional band value is larger changes in the control output value MV in response to changes in the input is smaller On the contrary as the proportional band value is smaller changes in the control output value MV in response to changes in the input is larger Generally the proportional band is the inverse number of the proportional gain However if the proportional band value is too large overshoot becomes large and it takes considerable time until the output is stabilized at the set value The allowable set range is from 0 0 to 1 000 0 When BFM 33 52 is set to 0 0 two position control is performed a MITSUBISHI 7 9 FX2N 2LC Temperature Control Block Buffer Memory BFM 7 7 2 18 7 2 19 BFM 34 CH1 and BFM 53 CH2 Integral time 1 In BFM 34 set the integral time of CH1 In BFM 53 set the integral time of CH2 The integral operation changes the operation quantity in proportion to the area enclosed by the deviation size and the period of time in which deviation is generated In the proportional operation even while the operation quantity is stable d
57. eviation which is the difference between the set value SV and the measured value PV may be caused by natural radiation etc The integral operation eliminates such a deviation At this time the period of time required to obtain only by the integral operation the operation quantity equivalent to that obtained by the proportional operation is called the integral time As the integral time is shorter the integral efficiency is better The allowable set range is from 0 to 3 600 sec BFM 35 CH1 and BFM 54 CH2 Derivative time D In BFM 35 set the derivative time of CH1 In BFM 54 set the derivative time of CH2 The derivative operation changes the operation quantity in proportion to the measured value change speed so that increase of deviation which is the difference between the set value SV and the measured value PV can be prevented from happening Because the derivative operation responds to the measured value change ratio the response to disturbances turbulence in the measured value caused by external factors is improved When the deviation increases or decreases at a constant ratio the period of time required to obtain only by the derivative operation the operation quantity equivalent to that obtained by the proportional operation is called the derivative time As the derivative time is longer the derivative effect is larger The allowable set range is from 0 to 3 600 sec When BFM 35 54 is set to 0 the deriv
58. f the unit is used in such a place electrical shock fire malfunction damages in the unit or deterioration of the unit may be caused e Never drop cutting chips or electric wire chips into the ventilation window of the FXan 2LC while drilling screw holes or wiring cables Such chips may cause fire failure or malfunction e After finishing installation remove a dust preventing sheet adhered on the ventilation window of the PLC and the FX2n 2LC If the sheet remains attached fire failure or malfunction may be caused e Securely connect cables such as extension cables and memory cassettes to specified connectors Imperfect contact may cause malfunction a MITSUBISHI 2 3 FX2N 2LC Temperature Control Block Product Configuration 2 2 5 Connection to PLC Main Unit Connect the FX2n 2LC to the PLC main unit with an extension cable FX2n 2LC units are treated as special blocks of the PLC and the special block No 0 to 7 is automatically assigned to each FX2n 2LC unit from the one nearest to the PLC main unit These unit Nos are used in FROM TO instructions One FX2n 2LC unit occupies eight I O points in the PLC main unit For the details of I O assignment in the PLC refer to the respective FX1n FX2N FX2NC FX3U FX3uc Series PLC manual FX2N 32MR FX2N 32ER X000 to X017 FX2N 4AD FX2N 2LC X020 to X037 FX2N 2LC esgeararae NA Z A WAE Vie eae ae IP
59. hen the set value is changed to a larger value A 0 0 to 100 0 of span Set by how many percentages of the span the set value is to increase in a minute The set value is changed When the power is turned ON the PV changes to the SV step by step if the change ratio limiter function is used When the setting change ratio limiter function is used When the alarm function is used the alarm wait function is not performed while the PV is changing to the SV step by step a MITSUBISHI 7 17 FX2N 2LC Temperature Control Block Buffer Memory BFM 7 7 2 28 7 2 29 BFM 45 CH1 and BFM 64 CH2 AT auto tuning bias In BFM 45 set the AT auto tuning bias of CH1 In BFM 64 set the AT auto tuning bias of CH2 The allowable set range is input range span C F Set the AT bias for control targets in which the measured value PV should not exceed the temperature set value SV while auto tuning is performed The auto tuning function performs two position control using the temperature set value SV hunts the measured value PV then calculates and sets each PID constant However for some control targets overshoot caused by hunting is not desirable Set the AT bias for such a case When the AT bias is set the set value SV AT point with which auto tuning is performed can be changed Measured value PV Example When the AT bias is set to Temperature set value SV AT bias AT
60. ing dimension 90 3 54 2 0 08 45 1 77 u 2 2 Name of each part 00 87 3 43 DIN rail width 35mm 1 38 mounting groove Status indicator LED Unit mm inches Mass 0 3kg 0 66lb Outer color Munsel s 0 08GY 7 64 0 81 Terminal block P X amp Eto amp Sl ee cal FXan 2LC rc Y O wm 4 a our2 gt TI E tar Ja O amp ay O H e o A 0 amp O PLC connection cable Io Q Screw mounting hole 7 9 24V DC Input Output terminal M3 terminal screws z4 2 S Status indicator LED ad 8 DIN rail mounting groove DIN rail width 35mm 1 38 DIN rail mounting hook Connector for next step extension cable s MITSUBISHI 21 FX2N 2LC Temperature Control Block Product Configuration 2 2 3 Status indication Table 2 1 LED name Indication Description Lit green 5 V power is supplied from PLC main unit POWER P E Extinguished 5 V power is not supplied from PLC main unit SAN Lit red 24 V power is supplied from outside Extinguished 24 V power is not supplied from outside Lit red OUT1 output is ON OUT1 Extinguished OUT1 output is OFF Lit red OUT2 output is ON OUT2 3 Extinguished OUT2 output is OFF
61. ion quantity At this time even ifthe deviation becomes smaller it takes some time until the output comes within the effective range because of the integral operation As a result execution of an actual correction operation is delayed and overshoot undershoot occurs In order to prevent overshoot the FX2n 2LC is equipped with the RFB reset feedback limiter function The RFB limiter function feeds back the excessive quantity to the integral value and makes the arithmetic operation result be held at the limit point when the PID arithmetic operation result exceeds the limit point upper lower limit of the output limiter so that the PID arithmetic operation result always remains inside the effective range Accordingly when a deviation becomes small the correction operation is immediately performed lt When the RFB limiter function is not provided gt lt When the RFB limiter function is provided gt The excessive quantity above the output limiter upper limit is fed back to the integral value and the arithmetic operation result is held at the upper limit value Operation Operation quantity quantity Output limiter upper limit Output limiter upper limit Output limiter lower limit Output limiter lower limit Temperature Temperature Target Target value value Large overshoot a MITSUBISHI 5 2 FX2N 2LC Temperature Control Block Introduction of Functions 5 5 2 Two position co
62. it operation region Wait operation region Non alarm status Alarm status Alarm status a MITSUBISHI 6 5 FX2N 2LC Temperature Control Block Alarm 6 MEMO a MITSUBISHI 6 6 FX2N 2LC Temperature Control Block Buffer Memory BFM 7 1 Introduction 2 Product Configuration 3 Specifications 4 Wiring 5 Introduction of Functions 6 Alarm 7 Buffer Memory BFM 8 Program Example 9 Diagnostic a MITSUBISHI FX2N 2LC Temperature Control Block Buffer Memory BFM 7 a MITSUBISHI FX2N 2LC Temperature Control Block Buffer Memory BFM 7 7 Buffer Memory BFM Each setting and alarm in the FX2n 2LC is written from or read to the PLC main unit through buffer memories hereafter referred to as BFM Each BFM consists of 16 bits Use FROM TO instructions in the 16 bit format 7 1 Buffer memory list Table 7 1 BFM No iti Name Description set range Initial Remarks CH1 CH2 value 0 Flag Error flag ready flag etc 0 1 2 Event Alarm status temperature rise 0 MH completed status etc 3 4 Measured value PV 5 of input range C F 0 0 R E 5 6 Control output value MV 5 0 to 105 0 5 0 A 7 8 Heater curren
63. lue an alarm Upper limit deviation value a l Input 12 f E is issued However when power is turned ON and alarm with re wait width when set value is changed measured value is ignored When deviation Measured value PV Set ci ae value SV is less than alarm set value an alarm Lower limit deviation value ae N Input 13 4 is issued However when power is turned ON and alarm with re wait 2 l width when set value is changed measured value is ignored When absolute deviation Measured value PV ae e Set value SV is more than alarm set value an Upper lower limit deviation ies Input 14 a alarm is issued However when power is turned E value alarm with re wait width ON and when set value is changed measured value is ignored Input range Numeric value from the lower limit to the upper limit of input value Input width Width from the lower limit to the upper limit of input value Input width Upper limit value Lower limit value Input width Both a positive and negative numeric values can be set Input width Only a positive numeric value can be set a MITSUBISHI 6 2 FX2N 2LC Temperature Control Block Alarm 6 Upper limit input value alarm When the measured value PV is more than the alarm set value an alarm is issued Measured value PV Measured value PV Alarm set value gt Non alarm status Alarm status
64. n GA Input 14 alarm is issued However when power is turned value alarm with re wait width ON and when set value is changed measured value is ignored Input range Numeric value from the lower limit to the upper limit of input value Input width Width from the lower limit to the upper limit of input value Input width Upper limit value Lower limit value Input width Both a positive and negative numeric values can be set Input width Only a positive numeric value can be set a MITSUBISHI 7 24 FX2N 2LC Temperature Control Block Buffer Memory BFM 7 7 2 35 BFM 76 Alarm 1 2 3 4 dead zone setting In BFM 76 set the dead zone of alarms 1 to 4 This setting is applied to all of alarms 1 to 4 When the measured value PV is near the alarm set value the alarm status and the non alarm status may be repeated by fluctuation in inputs In order to cope with such a case by setting the alarm dead zone repeating of the alarm status and the non alarm status can be prevented The allowable set range is the input range from 0 0 to 10 0 Upper limit input value alarm and upper limit deviation alarm Measured value PV Measured value PV Alarm set value gt Dead zone Non alarm status Alarm status Alarm status Lower limit input value alarm and lower limit deviation alarm Measured value PV Measured value PV Dead zone
65. nana nenen eee Thank you for taking the time to fill out this questionnaire We hope you found both the product and this manual easy to use a MITSUBISHI ii FX2N 2LC Tempereture Control Block a MITSUBISHI FX2N 2LC Tempereture Control Block Guidelines for the Safety of the User and Protection of the Temperature control block FX2n 2LC This manual provides information for the use of the Temperature control block FX2n 2LC The manual has been written to be used by trained and competent personnel The definition of such a person or persons is as follows a Any engineer who is responsible for the planning design and construction of automatic equipment using the product associated with this manual should be of a competent nature trained and qualified to the local and national standards required to fulfill that role These engineers should be fully aware of all aspects of safety with regards to automated equipment b Any commissioning or service engineer must be of a competent nature trained and qualified to the local and national standards required to fulfill that job These engineers should also be trained in the use and maintenance of the completed product This includes being completely familiar with all associated documentation for the said product All maintenance should be carried out in accordance with established safety practices c All operators of the completed equipment see Note should be trained to use this
66. nection alarm Turns ON when a heater disconnection alarm has occurred b10 Heater meltdown alarm Turns ON when a heater meltdown alarm has occurred Output ON OFF monitor b11 Applicable to Ver 1 22 or later Turns ON OFF according to the output status Decimal point position b12 0 Unit 1 C F 1 Unit 0 Turns ON when input range is set to 0 1 C F 1 C F Turns ON when transition to manual mode is completed Manual mode transition b13 Only while b13 is ON manual output set value can be completed written b14 AT aito unig Dang Remains ON while auto tuning is being performed performed b15 Temperature rise completed Turns ON after soak time BFM 80 is finished within status temperature rise completion range BFM 79 a MITSUBISHI 7 5 FX2N 2LC Temperature Control Block Buffer Memory BFM 7 Operation of b15 temperature rise completed status Example 1 When the soak time is set to 0 Set value SV gt Temperature rise completion range Temperature Te rise completed Example 2 When the soak time is set to any positive value Set value SV gt Temperature rise completion range Temperature rise completed This bit notifies that the measured value BFM 3 BFM 4 reaches near the set value BFM 12 BFM 21 When the measured value reaches the temperature rise completion range BFM 79 and the so
67. ns a value of K0 automatically The initial value of the setting limiter s upper lower limits are the input range s upper lower limits Initialization takes 500 ms maximum Do not activate FROM TO instructions on the BFM being initialized BFM 10 Error reset command In BFM 410 reset errors When BFM 10 is set to K1 all errors occurred in BFM 0 are reset If the causes of an error are not eliminated the corresponding error bit turns ON again The error reset command is not automatically set when another error has occurred Thus set BFM 10 to KO once again In order to execute the error reset command set BFM 10 to K1 for 0 5 seconds or longer BFM 11 Control start stop changeover When BFM 11 is set to KO initial value control stops When BFM 11 is set to K1 control starts When the PLC main unit is changed over from RUN to STOP outputs of the FX2n 2LC are held In order to stop outputs of the FX2n 2LC make sure to use BFM 11 a MITSUBISHI 7 7 FX2N 2LC Temperature Control Block Buffer Memory BFM 7 7 2 9 7 2 10 7 2 11 7 2 12 BFM 12 CH1 and BFM 21 CH2 Set value SV BFM 12 stores the set value of CH1 BFM 21 stores the set value of CH2 The unit is C 0 1 C F or 0 1 F in accordance with the setting of the input type selection BFM 70 BFM 71 The allowable set range is the selected input range When the setting limiter CH1 BFM 47 and BFM 4
68. ntrol When the proportional band P value is set to 0 0 the FX2n 2LC performs two position control In two position control the control output MV is set to ON when the measured value PV is larger than the temperature set value SV or OFF when the measured value PV is smaller than the temperature set value SV When the adjustment sensitivity dead zone is set repetitious turning ON OFF of the output around the temperature set value SV can be prevented However if the adjustment sensitivity dead zone is set to a large value upward downward fluctuation becomes large accordingly If the adjustment sensitivity dead zone is set to a small value chattering drastic repetitious turning ON OFF may be caused by small oscillations of measured values sal Sy Adjustment sensitivity dead zone The adjustment sensitivity is equally given to the upper portion and the lower portion of the temperature set value SV Operation output value MV a MITSUBISHI 5 3 FX2N 2LC Temperature Control Block Introduction of Functions 5 5 3 Auto tuning function 5 3 1 AT auto tuning The AT auto tuning function automatically measures calculates and sets optimal PID constants in accordance with the set temperature When the AT execution command CH1 BFM 20 CH2 BFM 29 is set to 1 auto tuning is performed Auto tuning can start from an arbitrary status at any time immediately after the powe
69. onse to setting becomes good the response to disturbance becomes deteriorated in PID control On the contrary if each PID constant is so set that the response to disturbance becomes good the response to setting becomes deteriorated The FX2n 2LC performs easy PID control with two degrees of freedom in which PID constants realizing good response to disturbance are adopted and the shape of the response to setting can be selected as either fast medium or slow Setting of PID constants and selection of the response to setting can be performed using buffer memories Conventional PID control When PID constants are set so that the response to changes in set value becomes good Response to changes in set value Response to disturbance Set value Set value SV yo SV TS When PID constants are so set that the response to disturbance becomes good Response to changes in set value Response to disturbance Set value Set value SV SV Easy PID control with two degrees of freedom Response to changes in set value Response to disturbance se Fast Medium Set value Set value SV SV S slow a MITSUBISHI 5 1 FX2N 2LC Temperature Control Block Introduction of Functions 5 5 1 2 Overshoot prevention function Generally in PID control when a deviation continues for a long time the PID arithmetic operation result exceeds the effective range from 0 to 100 of the operat
70. or output limiter lower limit When measured value PV does not decrease at least by loop breaking change criteria 2 C within loop breaking set time an alarm is issued When output is more than 100 or output limiter upper limit When measured value PV does not increase at least by loop breaking change criteria 2 C within loop breaking set time an alarm is issued Table 7 6 Cooling control normal operation When output is less than 0 or output limiter lower limit When measured value PV does not decrease at least by loop breaking change criteria 2 C within loop breaking set time an alarm is issued When output is more than 100 or output limiter upper limit When measured value PV does not increase at least by loop breaking change criteria 2 C within loop breaking set time an alarm is issued Abnormality targets 1 Abnormality in control target Heater disconnection lack of power supply wiring mistake etc 2 3 4 5 Abnormality in sensor Sensor disconnection short circuit etc Abnormality in operating machine Molten relay wiring mistake etc Abnormality in output circuit Molten relay inside instrument etc gt o Abnormality in input circuit No change in the measured value PV even after input has changed The loop breaking alarm function judges abnormalities in the control loop but cannot detect positions in which
71. peration 1 Once the power has been turned ON the FX2n 2LC is ready Temperature control ready flag turns ON 2 While the temperature control ready flag is ON the FX2n 2LC accepts TO instructions 3 The measured data is sampled for nine seconds after the temperature control ready flag turns ON and then stored in BFM 12 and 21 During this period of time the ON OFF operation is not executed a MITSUBISHI 7 4 FX2N 2LC Temperature Control Block Buffer Memory BFM 7 7 2 2 BFM 1 CH1 and BFM 2 CH2 Event BFM 1 corresponds to CH1 BFM 2 corresponds to CH2 Assignment is equivalent between BFM 1 and BFM 2 Table 7 3 Bit No Assignment Description bO Input error upper limit Turns ON when input value is over scale b1 Input error lower limit Turns ON when input value is under scale b2 Cold contact temperature Turns ON when an error has been caused by noise or when compensation data error a failure has occurred in FX2N 2LC If contents of error are not eliminated even after power is b3 A D converted value error turned OFF once then ON again contact Mitsubishi Electric System Service b4 Alarm 1 Turns ON when an alarm has occurred b5 Alarm 2 Turns ON when an alarm has occurred b6 Alarm 3 Turns ON when an alarm has occurred b7 Alarm 4 Turns ON when an alarm has occurred b8 Loop breaking alarm Turns ON when a loop breaking alarm has occurred b9 Heater discon
72. point gt AT starts AT finishes BFM 46 CH1 and BFM 65 CH2 Normal reverse operation selection In BFM 46 select the normal or reverse operation of CH1 In BFM 65 select the normal or reverse operation of CH2 When BFM 46 65 is set to KO normal operation is selected When BFM 46 65 is set to K1 initial value reverse operation is selected Table 7 4 Normal operation 0 When actual temperature is higher than set value To control cooling Reverse operation 1 When actual temperature is lower than set value To control heating The initial value is reverse operation to control heating a MITSUBISHI 7 18 FX2N 2LC Temperature Control Block Buffer Memory BFM 7 7 2 30 BFM 47 CH1 and BFM 66 CH2 Setting the upper limit BFM 48 CH1 and BFM 67 CH2 Setting the lower limit In BFM 47 and BFM 66 enter the upper range limit of CH1 and CH2 respectively In BFM 48 and BFM 67 enter the lower range limit of CH1 and CH2 respectively Use these BFMs to set the upper and lower limits for the temperature set value SV BFM 12 BFM 21 The default range is 100 to 1300 C If the Set Value SV temperature is entered that is outside the input range the set range error flag BFM 0 b1 turns ON If an input range value upper lower is entered that is not allowable the set range error flag BFM 0 b1 turns ON The same flag is used for bo
73. product in a safe manner in compliance to established safety practices The operators should also be familiar with documentation which is associated with the operation of the completed equipment Note Note the term completed equipment refers to a third party constructed device which contains or uses the product associated with this manual Notes on the Symbols Used in this Manual At various times throughout this manual certain symbols will be used to highlight points of information which are intended to ensure the users personal safety and protect the integrity of equipment Whenever any of the following symbols are encountered its associated note must be read and understood Each of the symbols used will now be listed with a brief description of its meaning Hardware Warnings 1 Indicates that the identified danger WILL cause physical and property damage 2 Indicates that the identified danger could POSSIBLY cause physical and property damage 3 Indicates a point of further interest or further explanation OPE 0 O o 5 gt Q 0 4 Indicates special care must be taken when using this element of software 5 Indicates a special point which the user of the associate software element should be aware of 6 Indicates a point of interest or further explanation 90O a MITSUBISHI v FX2N 2LC Tempereture Control Block Under no circumstances will Mitsubishi Electric be liable responsibl
74. r is turned ON while the temperature is rising or while control is stable When auto tuning starts two position control is performed using the set value SV By two position control the output is forcedly hunted and its amplitude and oscillation cycle are measured PID constants are calculated based on the measured values and stored in each parameter The value is set to each parameter within the range shown below Table 5 1 Applicable parameter Calculated value Value to be set Proportional band Less than 0 1 0 1 0 in version earlier than 1 22 BFM 33 52 1000 0 or more 1000 0 Integral time Less than 1 sec 1 sec BFM 34 53 3600 sec or more 3600 sec en 3600 sec or more 3600 sec When auto tuning normally finishes control continues with new calculated PID constants While auto tuning is performed b14 of the event CH1 BFM 1 CH2 BFM 2 is set to 1 For auto tuning the AT bias can be set In order to calculate proper PID constants by auto tuning set the upper limit of the output limiter to 100 the lower limit of the output limiter to 0 and the output change ratio limiter function to OFF Measured value PV Example When AT is performed while the temperature is rising Temperature set value SV AT starts AT finishes a MITSUBISHI 5 4 FX2N 2LC Temperature Control Block Introduction of Functions 5 5 3 2 Conditions for perfo
75. rature is rising Non alarm status region While the temperature is decreasing Alarm status region 3 LBD operation gap 0 01 FS a MITSUBISHI 721 FX2N 2LC Temperature Control Block Buffer Memory BFM 7 7 2 33 BFM 70 CH1 and BFM 71 CH2 Input type selection In BFM 70 select the input type of CH1 In BFM 71 select the input type of CH2 The initial value is 2 Table 7 7 En ve Input range Unit en gek Input range Unit 0 200 0 to 200 0 10 1 C 24 B 0 to 1800 C 100 0 to 400 0 10 1 C 25 0 to 3000 F 2 K 100 to 1300 C 26 0 to 1300 C 3 100 to 800 SE 27 0 to 2300 F 4 100 to 2400 F 28 Si 0 to 1200 C 5 200 0 to 200 0 10 1 C 29 0 to 2300 F 6 100 0 to 400 0 10 1 C 30 0 to 2300 C 7 100 0 to 800 0 10 1 C 31 ae 0 to 3000 F 8 i 100 to 1200 C 32 U 200 0 to 600 0 10 1 C 9 100 to 1600 F 33 300 0 to 700 0 10 1 F 10 100 to 2100 F 34 i 0 0 to 900 0 10 1 C 11 a O to 1700 C 35 O to 1600 F 12 0 to 3200 F 36 50 0 to 150 0 10 1 C 13 0 to 1700 C 37 200 0 to 500 0 10 1 C S JPt100 14 O to 3200 F 38 300 0 to 300 0 10 1 F 15 200 0 to 200 0 10 1 C 39 300 to 900 F 16 E 0 to 1000 C 40 50 0 to 150 0 10 1 C 17 0 to 1800 F 41 piod 200 0 to 600 0 10 1 C
76. rming and aborting AT 1 AT can be performed when all the following conditions are satisfied The control start stop changeover BFM 11 set to 1 Starts control The operation mode BFM 32 51 set to 2 Monitor Temperature alarm Control The auto manual mode changeover BFM 18 27 set to 0 AUTO The measured value PV BFM 3 4 is normal The upper limit BFM 37 56 and lower limit BFM 38 57 of the output limiter should not be set to the same value The proportional band BFM 33 52 setting is not 0 0 two position control 2 AT is aborted and the AT abnormal termination flag BFM 0 b6 CH1 b7 CH2 turns ON during either of the following occurrences The measured value PV BFM 3 4 becomes abnormal from an incident such as wire disconnection The set value SV BFM 12 21 is changed The control start stop changeover BFM 11 is set to 0 Stops control The input type selection BFM 70 71 is changed The auto manual mode BFM 18 27 is set to 1 MAN The operation mode BFM 32 51 is set to 0 Monitor or 1 Monitor Temperature alarm The AT bias BFM 45 64 is changed The PV bias BFM 40 59 is changed The primary delay digital filter setting BFM 43 62 is changed The upper BFM 37 56 and lower limits BFM 38 57 of the output limiter are changed The proportional band BFM 33 52 is set to 0 0 two position control The calculated value of the PI
77. s The set value should be the actual value multiplied by ten multiplied by 100 for BFM 40 and 59 Example 100 0 actual value gt 1000 set value Handling integers or numbers containing decimal places according to the input sensor type setting of BFM 70 and 71 When handling numbers containing decimal places multiply the set value by ten As to a numeric value containing a decimal point and numbers after that set it as a value multiplied by 10 Example 100 0 actual value gt 1000 set value If a value is written by mistake to a buffer memory used only for read the written value is ignored And 500 ms later the buffer memory is overwritten with a correct value If a value outside the allowable set range is written to a buffer memory used both for read and write the set value range error b1 ofthe flag BFM 0 turns ON And the buffer memory in which the set value range error has occurred is controlled with the upper limit or the lower limit of the allowable set range a MITSUBISHI 73 FX2N 2LC Temperature Control Block Buffer Memory BFM 7 7 2 Details of buffer memories 72 1 BFM 0 Flag Table 7 2 Bit No Description Operation Turns ON when an error among b1 to b10 below has bo Error present occurred b1 Set value range error Turns ON when data outside set range is written Turns ON when driving power supply 24 VDC is not b2 24 VDC power supply error supplied Turns ON
78. sured value has reached the temperature rise completion range but is not stable yet by setting the soak time the wait time can be set for judgement on temperature rise completion Example 1 When the soak time is set to 0 Set value SV gt Temperature rise completion range Temperature AA rise completion Example 2 When the soak time is set to any positive value Set value SV gt Temperature rise completion range _ Temperature rise completion 7 2 40 BFM 81 CT monitor method changeover 7 2 41 In BFM 81 change over the CT monitor method This setting is applied to both CH1 and CH2 The current is detected by sampling performed every second While the temperature is controlled the control output repeatedly turns ON and OFF Accordingly the current in the ON time ON current and the current in the OFF time OFF current are alternately displayed If the output cycle is short the displayed value is not stable and is difficult to read To cope with this the display monitor method can be selected When BFM 81 is set to KO initial value the ON current and the OFF current are alternately displayed When BFM 81 is set to K1 only the ON current is displayed Even in the OFF time the ON current remains displayed When control is stopped the OFF current is displayed without regard to the setting of B
79. t measured value 0 0 to 105 0 A 0 0 A 0 Performs nothing 9 Initialization command 1 Initializes all data 0 2 Initializes BFM 10 to BFM 69 10 Error reset command EOTIORIDS noning 0 1 Resets errors 0 Stops control 11 Control start stop changeover 1 Starts control 0 12 21 Set value SV Within set range limiter 0 0 a 13 22 Alarm 1 set value Unit C or F 0 0 E 14 23 Alarm 2 set value Allowable set range varies 0 0 R W 5 15 24 Alarm 3 set value depending on alarm mode 0 0 C 16 25 Alarm 4 set value sung 0 0 a Heater disconnection alarm set prado A x 17 26 When 0 0 is set alarm function 0 0 A value Ne is disabled 18 27 Auto manual mode changeover 0 AUTO 1 MAN 0 19 28 Manual output set value 5 0 to 105 0 1 0 0 A 20 29 Auto tuning execution command o POPR AUO tony 0 s 1 Performs auto tuning 30 Unit type code 2060 R 31 Prohibited 0 Monitor 32 51 Operation mode f Monitor Temperature alarm 2 en 2 Monitor Temperature alarm Control 0 0 to 1 000 0 of input span RW x 33 52 Proportional band When 0 0 is set two position 3 0 A control is performed 34 53 Integral time 1 to 3 600 sec 240 35 54 Derivative time O to 3 600 sec 60 a MITSUBISHI 7 1 FX2N 2LC Temperature Control Block Buffer Memory BFM 7
80. t set The initial values are used Device assignment Inputs X000 Performs initialization when the power is turned ON from OFF X001 Resets errors when the power is turned ON from OFF X002 Control start ON stop OFF X003 Performs auto tuning when the power is turned ON from OFF CH1 X004 Performs auto tuning when the power is turned ON from OFF CH2 X005 Writes the EEPROM when the power is turned ON from OFF Auxiliary relays MO to M15 Flags M20 to M35 Events CH1 M40 to M55 Events CH2 a MITSUBISHI 8 2 FX2N 2LC Temperature Control Block Program Example 8 Data registers DO D1 Set values D2 Not used D3 Temperature measured value PV of CH1 D4 Temperature measured value PV of CH2 D5 Control output value MV of CH1 D6 Control output value MV of CH2 D7 Heater current measured value of CH1 D8 Heater current measured value of CH2 D82 Set value range error address a MITSUBISHI 8 3 FX2N 2LC Temperature Control Block Program Example 8 PLC program M8002 MOV K1000 DO MOV K1000 D1 M8000 TO KO K 12 DO Ki TO KO K 21 D1 K 1 M15 TOH KO K13 K 300 Ki Temperat ure control TOH KO K22 K300 K1 ready flag TO B KO K 14 K 300 K 1 TOH KO K23 K 300 Ki TOH KO K 32 K2 K 1
81. tage of the ON period of time BFM 20 CH1 and BFM 29 CH2 Auto tuning execution command In BFM 20 perform auto tuning of CH1 In BFM 29 perform auto tuning of CH2 When BFM 20 29 is set to KO auto tuning is stopped When BFM 20 29 is set to K1 auto tuning is performed In order to execute AT again set BFM 20 and 29 to KO after the initial AT is completed b14 of both BFM 1 and 2 turns OFF and then set once more to K1 BCM 30 Unit type code BFM 30 stores the unit type code 2060 fixed value of the FX2n 2LC BFM 32 CH1 and BFM 51 CH2 Operation mode In BFM 82 select the operation mode of CH1 In BFM 51 select the operation mode of CH2 When BFM 32 51 is set to KO only monitor is performed At this time the control output remains OFF When BFM 32 51 is set to K1 monitor and temperature alarm are performed At this time the control output remains OFF When BFM 32 51 is set to K2 initial value all of monitor temperature alarm and control are performed Monitor Monitors the measured value BFM 3 4 Temperature alarm Monitors the event input error bO and b1 of BFM 1 and BFM 2 and alarms 1 to 4 b4 to b7 of BFM 1 and BFM 2 Control Performs temperature control PID control and gives the control output The setting of KO to K2 above is effective only when control starts BFM 11 While control is stopped only monitor is performed without regard to the s
82. th types of errors When changing the input range values make sure that the upper and lower limit values are inside the allowable input range The allowable set range for the lower limit is the higher of two values the default value 100 C or the lower limit for the sensor used values shown on page 7 22 The allowable set range for the upper limit is the lower of two values the default setting of 1300 C or the upper limit for the sensor used values shown on page 7 22 The initial value is the default input range 100 to 1 300 a MITSUBISHI 7 19 FX2N 2LC Temperature Control Block Buffer Memory BFM 7 7 2 31 BFM 49 CH1 and BFM 68 CH2 Loop breaking alarm judgement time In BFM 49 set the loop breaking alarm judgement time of CH1 In BFM 68 set the loop breaking alarm judgement time of CH2 The loop breaking alarm function starts to detect the variation of the measured value PV at every loop breaking alarm judgment time when the output becomes more than 100 or the output limiter upper limit or less than 0 or the output limiter lower limit then sets to ON the loop breaking alarm CH1 BFM 1 b8 CH2 BFM 2 b8 when judging that there is an abnormality in the control loop The allowable set range is from 0 to 7 200 sec When BFM 49 68 is set to 0 the loop breaking alarm function is disabled Abnormality judgment criteria Table 7 5 Heating control reverse operation When output is less than 0
83. tion is 480 time disabled 50 69 Loop breaking alarm dead zone 0 0 or 0 to input span C F 0 0 a 70 71 Input type selection 0 to 43 2 72 Alarm 1 mode setting 0 73 Alarm 2 mode setting 0 0 to 14 74 Alarm 3 mode setting 0 75 Alarm 4 mode setting 0 76 Alarm 1 2 3 4 dead zone setting 0 0 to 10 0 of input span 1 0 A 77 Number of times of alarm 1 2 3 O to 255 times 0 SE 4 delay 478 Number of times of heater 3 to 255 times 3 disconnection alarm delay 79 Temperature rise completion Integer 1 to 10 C F 10 e range setting 480 Temperature rise completion 0 to 3600 sec 0 is soak time a MITSUBISHI 72 FX2N 2LC Temperature Control Block Buffer Memory BFM 7 Table 7 1 BFM No iti Name Description set range tial Remarks CH1 CH2 value 0 Monitors both ON current and 81 CT monitor method changeover OFF current 0 R W 1 Monitors only ON current 0 Normal ee 82 Set value range error address 1 or another numeric value 0 R Setting error address 0 Normal 83 Set value backup command 1 Starts to write EEPROM 0 R W 1 Only read is enabled R W Setting data can be backed up by EEPROM in accordance with the setting of BFM 83 Write is enabled when the manual mode transition completion flag is ON Both read and write are enabled Handling numbers containing decimal place
84. tion until the measured value PV goes out of the alarm status once When control starts the wait operation is performed also lt When the wait operation is performed gt lt When the wait operation is not performed gt Measured value PV PY Measured value Measured value PV Measured value PV yee EY Temperature Temperature set value SV gt a set value SV Devia tion Alarm set tion value Alarm set value gt gt Alarm status Wait operation region Non alarm Alarm status status Alarm status Alarm re wait operation The alarm re wait operation ignores the alarm status of the measured value PV occurred when the power is turned ON and disables the alarm function until the measured value PV goes out of the alarm status once When the temperature set value SV is changed the measured value PV for deviation alarm changes accordingly At this time even if the measured value PV becomes the alarm status the alarm re wait function ignores it again and disables the alarm function until the measured value PV goes out of the alarm status again Re wait operation Measured value PV Measured value PV Temperature set gt value SV t Deviation Alarm set value gt Set value is changed Temperature set value SV1 t Deviation Alarm set value gt Time gt gt Wa
85. types can be used in accordance with the application The alarm types to be used can be selected using buffer memories The result of each alarm is written to BFM 1 and BFM 2 and can be read in the PLC main unit When the measured value PV is near the alarm set value of an used alarm type the alarm status and the non alarm status may be repeated by fluctuation in inputs In order to cope with such a case the alarm dead zone can be set to prevent repeating of the alarm status and the non alarm status The dead zone of alarms 1 to 4 can be set using BFM 76 Table 6 1 Alarm TF Set No Alarm type Description range 0 Alarm function OFF Alarm function is disabled DER When measured value PV is more than alarm set Input 1 Upper limit input value alarm SA value an alarm is issued range E When measured value PV is less than alarm set Input 2 Lower limit input value alarm E value an alarm is issued range When deviation Measured value PV Set din 3 Upper limit deviation alarm value SV is more than alarm set value an alarm dl is issued When deviation Measured value PV Set laden 4 Lower limit deviation alarm value SV is less than alarm set value an alarm ae is issued When absolute deviation Measured value PV Input 5 Upper lower limit deviation Set value SV is more than alarm set value an UR alarm is issued When absolute deviation Measured value P

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