FX2N-4AD SPECIAL FUNCTION BLOCK USER'S GUIDE
Contents
1. BFM 21 L TORE ko kai i J BFM 21 gain offset prohibition must be set to permission with b1 bO 0 1 i KO gt BFM 22 offset gain adjustment L TODA KO Ko K K J Reset adjustment bits TO 1 TOR Ko K23 Ko K1 KO gt BFM 23 offset TOBY Ko 24 K2500 K1 l K2500 gt BFM 24 gain H0003 gt BFM 22 offset gain adjustment TOR KO kaa OOO F o oie Ol Olei Channel 1 is adjusted ae K4 End of adjustment RST Mo 7 K2 gt BFM 21 TOR KO Keti Ka KI BEM 21 gain ofiset prohibition 9 DIAGNOSTICS 9 1 Preliminary checks Check whether the input wiring and or extension cables are properly connected on the FX2N 4AD analog special function block Il Check that the PLC system configuration limits have not been exceeded i e the number of special function blocks and the total system I O are within the specified range Ill Ensure that the correct operating range has been selected for the application IV Check that there is no power overload on either the 5V or 24V power sources remember the loading on a main unit or a powered extension unit varies according to the number of extension blocks or special function blocks connected V Make sure that the main unit has been switched to RUN 9 2 Error checking If the FX2N 4AD special function block does not seem to operate normally check the following items e Check the status of2. Gain determines the angle or slope of the calibration line identified at a digital value of 1000 Offset is the Position of the calibrated line identified at a digital value of O a Small gain value Large steps in digital d Negative offset readings e Zero offset default OV or 4mA b Zero gain value default 5V or 20mA f Positive offset c Large gain value Small steps in digital readings Offset and gain can be set independently or together Reasonable offset ranges are 5V to 5V or 20mMA to 20mA and gain value offset value 1V to 15V or 4mA to 32mA Gain and offset can be adjusted by software in the main unit see program example 2 e Bit device s b1 b2 of the gain offset BFM 21 should be set to 0 1 to allow adjustment e Once adjustment is completed these bit devices should be set to 1 O to prohibit any further changes 8 EXAMPLE PROGRAM 8 1 Basic Program In the following example channels CH1 and CH2 are used as voltage inputs The FX2N 4AD block is connected at the position of special function block No 0 The number of averaged samples is set at 4 and data registers DO and D1 of the main unit receive the averaged digital data S H The ID code for the special function block at position 0 is initial FROM Ko kK30 D4 KI read from BFM 30 of that block and stored at D4 in the main unit paas This is compared with K2010 to check that the block is a FX2n 4AD if OK M1 is turned ON These two p
3. Make sure that the main unit has been switched to RUN 2 Error checking If the FX2N 4AD special function block does not seem to operate normally check the following items Check the status of the POWER LED Lit The extension cable is properly connected Otherwise Check the connection of the extension cable Check the external wiring Check the status of the 24V LED top right corner of the FX2n 4AD Lit FX2n 4AD is OK 24V DC power source is OK Otherwise Possible 24VDC power failure if OK possible FX2n 4AD failure Check the status of the A D LED top right corner of the FX2n 4AD Lit A D conversion is proceeding normally Otherwise Check buffer memory 29 error status If any bits b2 and b3 are ON then this is why the A D LED is OFF This manual confers no industrial property rights or any rights of any other kind nor does it confer any patent licenses Mitsubishi Electric Corporation cannot be held responsible for any problems involving industrial property rights which may occur as a result of using the contents noted in this manual Manual number JY992D65201 Manual revision D Date March 2007 a MITSUBISHI ELECTRIC CORPORATION HEAD OFFICE TOKYO BUILDING 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN HIMEJI WORKS 840 CHIYODA CHO HIMEuI JAPAN a MITSUBISHI PROGRAMMABLE CONTROLLERS MELSEGF Changes for the Better FX2N 4AD SPECIAL FUNCTION BLOCK USER S GUID
4. Digital circuits Isolation Number of occupied I O points 5V DC 30mA internal power supply from main unit Photo coupler isolation between analog and digital circuits DC DC converter isolation of power from the main unit No isolation between analog channels The analog block occupies 8 points can be either inputs or outputs 5 3 Performance specification Analog Inputs Voltage input Current input Either voltage or current input can be selected with your choice of input terminal Up to four input points can be used at one time DC 10V to 10V DC 20mA to 20mA Analog input input resistance 200kQ input resistance 250Q range Warning this unit may be damaged by an Warning this unit may be damaged by an input voltage in excess of 15V input currents in excess of 32mA Diaital outbut 12 bit conversion stored in 16 bit 2 s complement form g p Maximum value 2047 Minimum value 2048 5mV 10V default range 1 2000 20uA 20mA default range 1 1000 1 for the range of 10V to 10V 1 for the range of 20mA to 20mA accuracy 15ms channel Normal speed 6ms channel High speed Analog Inputs continued Preset 0 10V to 10V Preset 1 4mA to 20mA Preset 2 20mA to 20mA 2 000 Digital output i 10 235V TIGY Digital gt output Voltage input Ba 2 20mMA 2 000 Current input Current input P NOTE P
5. a oN read from BFM 30 of that block and stored at D4 in the main unit aii This is compared with K2010 to check that the block is a T CMP K2010 D4 M FX2n 4AD if OK M1 is turned ON These two program steps L m are not strictly needed to perform an analog read They are however a useful check and are recommended as good practice A TORI ko KO H3300 K1 The analog input channels CH1 CH2 are setup by writing g H3300 to the BFM 0 of the FX2n 4AD The number of averaged samples for CH1 and CH2 is set to 4 L 19 i i mr e A by writing 4 to the BFM 1 and 2 respectively Do not execute the pulse form of the instruction FROM KO K29 K4M10 Ki The operational status of the FX2n 4AD is read from BFM 29 L 4 and output as bit devices of the main unit M10 M20 If there are no errors in the operation of the FX2n 4AD then a ee PROM KO Ko DO ne the averaged data BFM s are read NO Digital output In the case of this example BFM 5 and 6 are read into the error value is normal main unit and stored in DO and D1 These devices contain the averaged data for CH1 and CH2 respectively 8 2 Using gain and offset in a program The following is an example of changing the offset value on input channel CH1 to OV and the gain value to 2 5V The FX2N 4AD block is in the position of block No 0 i e closest to the main unit Example Adjusting gain offs
6. electrical noise If a voltage ripple occurs during input or there is electrically induced noise on the external wiring connect a smoothing capacitor of 0 1 to 0 47 uF 25V If you are using current input connect the V and l terminals to each other If there is excessive electrical noise connect the FG frame ground terminal with the grounded terminal on the FX2N 4AD In CH1 there is no FG terminal Use FG terminal of other channels Connect the ground terminal on the FX2N 4AD unit with the grounded terminal on the main unit Use grounding on the main unit if available The FX2N 4AD unit can be connected to the PLCs as follows Resrictions apply to the maximum number of connectable units depending on the DC24V DC5V Power Supply capacities and the Main Unit Special Function Unit types For details refer to the respective PLC manual FX2N FX3U The maximum connectable units is 8 FX2NC The maximum connectable units is 4 To connect the FX2N 4AD with the FX2Nc main unit FX2Nc CNV IF is required FX1N FXON 5 SPECIFICATIONS The maximum connectable units is 8 The maximum connectable units is 4 5 1 General specification General specifications Same as those for the main unit Dielectric withstand voltage 500V AC 1min between all terminals and ground 5 2 Performance specification and others 24V DC 10 55mA external power supply from the main unit Analog circuits
7. failure arr Digital output value is less than oy b10 Digital range error 2048 or more than 2047 Digital output value is normal Number of averaging samples is b11 Averaging error 4097 or more or 0 or less default of 8 will be used ae Prohibit b1 bO of BFM 21 is Permit b1 bO of BFM 21 is b12 Offset gain adjust prohibit set to 1 0 set to 0 1 NOTE b4 to b7 b9 and b13 to b15 are undefined Averaging is normal between 1 and 4096 5 Identification Code BFM 30 The identification or ID code number for a Special Function Block is read using the FROM instruction This number for the FX2N 4AD Special Function Block unit is K2010 The user s program in the PLC can use this facility in the program to identify the special function block before commencing data transfer from and to the special function block CAUTION e Values of BFM 0 23 and 24 are copied to the EEPROM memory of the FX2n 4AD BFM 21 and BFM 22 are only copied when data is written to the gain offset command buffer BFM 22 Also BFM 20 causes the resetting of the EEPROM memory The EEPROM has a life of about 10 000 cycles changes so do not use programs which frequently change these BFMs e Due to the time needed to write to the EEPROM memory a delay of 300 ms is required between instructions that cause a write to the EEPROM Therefore a delay timer should be used before writing to the EEPROM for a second time 7 DEFINING GAI
8. power from the main unit No isolation between analog channels Number of occupied I O points we analog ook OpeuUpIES 8 pomis can be either inputs or outputs 5 3 Performance specification Analog Inputs Voltage input Current input Either voltage or current input can be selected with your choice of input terminal Up to four input points can be used at one time DC 20mA to 20mA input resistance 250Q DC 10V to 10V Analog input input resistance 200kQ range Warning this unit may be damaged by an Warning this unit may be damaged by an input voltage in excess of 15V input currents in excess of 32mA Diaital outbut 12 bit conversion stored in 16 bit 2 s complement form g p Maximum value 2047 Minimum value 2048 5mV 10V default range 1 2000 20uA 20mA default range 1 1000 1 for the range of 10V to 10V 1 for the range of 20mA to 20mA accuracy 15ms channel Normal speed 6ms channel High speed Analog Inputs continued Preset 0 10V to 10V Preset 1 4mA to 20mA Preset 2 20mA to 20mA 2 000 Digital output l 10 235V EION Digital gt output Voltage input Er 20mA 2 000 Current input Current input NOTE Preset ranges are selected by an appropriate setting in the buffer memory of the analog block Current Voltage input selection must match the correct input terminal connectio
9. sent to the analog special function block Otherwise the previous values held in the analog block will be used The buffer memory also gives a facility to adjust the offset and gain via software Offset intercept The analog input value when the digital output becomes 0 Gain slope The analog input value when the digital output becomes 1000 1 Channel Selection Channel selection is made by a 4 character HEX number HOOOO in buffer memory BFM 0 The least significant character controls channel 1 and the 4th character controls channel 4 Setting of each character is as follows O 0 Preset range 10V to 10V O 2 Preset range 20mA to 20mA O 1 Preset range 4mA to 20mA O 3 Channel OFF Example H3310 CH1 Preset range 10V to 10V CH2 Preset range 4mA to 20mA CH3 CH4 Channel OFF 2 Analog to Digital Conversion Speed Change By writing O or 1 to BFM 15 of the FX2N 4AD the speed at which A D conversion is performed can be changed However the following points should be noted To maintain a high speed conversion rate use the FROM TO instructions as seldom as possible NOTE When a conversion speed change is made BFM 1 4 are set to their default values immediately after the change This is regardless of the values they held originally Bear this in mind if a speed change will be made as part of the normal program execution 3 Adjusting Gain and Offset values a When buffer memory BFM 20 is activ
10. the POWER LED Lit The extension cable is properly connected Otherwise Check the connection of the extension cable e Check the external wiring e Check the status of the 24V LED top right corner of the FX2n 4AD Lit FX2 n 4AD is OK 24V DC power source is OK Otherwise Possible 24VDC power failure if OK possible FX2n 4AD failure e Check the status of the A D LED top right corner of the FX2n 4AD Lit A D conversion is proceeding normally Otherwise Check buffer memory 29 error status If any bits 02 and b3 are ON then this is why the A D LED is OFF This manual confers no industrial property rights or any rights of any other kind nor does it confer any patent licenses Mitsubishi Electric Corporation cannot be held responsible for any problems involving industrial property rights which may occur as a result of using the contents noted in this manual Manual number JY992D65201 Manual revision D Date March 2007 a MITSUBISHI ELECTRIC CORPORATION HEAD OFFICE TOKYO BUILDING 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN HIMEJI WORKS 840 CHIYODA CHO HIMEJI JAPAN
11. Changes for the Better a MITSUBISHI PROGRAMMABLE CONTROLLERS MELSEGF FX2N 4AD SPECIAL FUNCTION BLOCK USER S GUIDE JY992D65201D This manual contains text diagrams and explanations which will guide the reader in the correct installation and operation of the FX2N 4AD and should be read and understood before attempting to install or use the unit Further information can be found in the FX SERIES PROGRAMMING MANUAL II FXoN FX1N FX2N FX2Nc FX3u SERIES HARDWARE MANUAL Guidelines for the Safety of the User and Protection of the FX2N 4AD special function block This manual should be used by trained and competent personnel The definition of such a person or persons is as follows a Any engineer using the product associated with this manual should be of a competent nature trained and qualified to the local and national standards 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 c All operators of the completed equipment should be trained to use this product in a safe and coordinated manner in compliance to established safety practices 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
12. E JY992D65201D This manual contains text diagrams and explanations which will guide the reader in the correct installation and operation of the FX2N 4AD and should be read and understood before attempting to install or use the unit Further information can be found in the FX SERIES PROGRAMMING MANUAL II FXoNn FX1N F X2N FX2nNc FX3U SERIES HARDWARE MANUAL Guidelines for the Safety of the User and Protection of the FX2N 4AD special function block This manual should be used by trained and competent personnel The definition of such a person or persons is as follows a Any engineer using the product associated with this manual should be of a competent nature trained and qualified to the local and national standards 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 c All operators of the completed equipment should be trained to use this product in a safe and coordinated manner in compliance to established safety practices 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 p
13. N AND OFFSET Gain a b Offset d ce f Digital 1 000 t A i Pai a Digital Se oa g g Offset value 7 Gain value pais Analog gt Gain determines the angle or slope of the Offset is the Position of the calibrated line calibration line identified at a digital value of 1000 identified at a digital value of O a Small gain value Large steps in digital d Negative offset readings e Zero offset default OV or 4mA b Zero gain value default 5V or 20mA f Positive offset c Large gain value Small steps in digital readings Offset and gain can be set independently or together Reasonable offset ranges are 5V to 5V or 20mA to 20mA and gain value offset value 1V to 15V or 4mA to 32mA Gain and offset can be adjusted by software in the main unit see program example 2 e Bit device s b1 b2 of the gain offset BFM 21 should be set to 0 1 to allow adjustment e Once adjustment is completed these bit devices should be set to 1 O to prohibit any further changes 8 EXAMPLE PROGRAM 8 1 Basic Program In the following example channels CH1 and CH2 are used as voltage inputs The FX2N 4AD block is connected at the position of special function block No 0 The number of averaged samples is set at 4 and data registers DO and D1 of the main unit receive the averaged digital data rr p The ID code for the special function block at position 0 is initial ee fe
14. Programmable Controllers PLC e Data transfer between the FX2n 4AD and the main unit is by buffer memory exchange There are 32 buffer memories each of 16 bits in the FX2n 4AD e The FX2n 4AD occupies 8 I O points on the FX2n expansion bus The 8 I O points can be allocated from either inputs or outputs The FX2n 4AD draws 30mA from the 5V rail of the main unit or powered extension unit 2 EXTERNAL DIMENSIONS Weight Approx 0 3 kg 0 66 lbs Dimensions mm inches 87 3 43 Mounting holes A DIN rail a es Mounting slot Deg 35mm 1 38 ss f o ol L co E FXan 4AD Extension cable and connector 3 WIRING Voltage input 10V to 10V vn z 100KQ gt Q 14 A200 CH4 VI AD Fel hoko Shielded AG Current input 20mA to 20mA CH1 aAA 100KQ l l amp Ce O CH1 VI P AD ooko Shielded FG 15V DC24V 55mA oA gt pe 3 ii DC DC ms AG F DA converter 15V Grounding FXe2n 4AD eae sige ee AE Extension cable Analog Input Block 4 CONNECTION WITH PLC The analog input is received through a twisted pair shielded cable This cable should be wired separately from power lines or any other lines which may induce
15. adjustments b If b1 bO of BFM 21 is set to 1 0 gain and offset adjustments are prohibited to prevent inadvertent changes by the operator In order to adjust the gain and offset values bits b1 bO must be set to 0 1 The default is 0 1 c Offset and gain values of BFM 23 and 24 are sent respectively to the offset and gain resisters in non volatile memory of the specified input channels Input channels to be adjusted are specified by the appropriate G O gain offset bits of BFM 22 Example lf bits G1 and O1 are set to 1 input channel 1 will be adjusted when BFM 22 is written to by a TO instruction d Channels can be adjusted individually or together with the same gain and offset values e Offset and gain values in BFM 23 and 24 are in units of mV or m A Due to the resolution of the unit the actual response will be in steps of 5mV or 20 m A 4 Status Information BFM 29 When any of b1 to b4 is ON If any of b2 to b4 is ON A D conversion of all the channels is stopped b1 Offset gain error Oseyan gata r INE EEPRON Offset Gain data normal is corrupted or adjustment error b2 Power source abnormality 24V DC power supply failure Power supply normal No error b3 Hardware error A D converter or other hardware Hardware Normal failure aie Digital output value is less than b10 Digital range error 2048 or more than 2047 Digital output value is normal Number of averaging samples is 4097 or more o
16. ated by setting it to K1 all settings within the analog special function block are reset to their default settings This is a very quick method to erase any undesired gain and offset adjustments b If b1 bO of BFM 21 is set to 1 0 gain and offset adjustments are prohibited to prevent inadvertent changes by the operator In order to adjust the gain and offset values bits b1 bO must be set to 0 1 The default is 0 1 c Offset and gain values of BFM 23 and 24 are sent respectively to the offset and gain resisters in non volatile memory of the specified input channels Input channels to be adjusted are specified by the appropriate G O gain offset bits of BFM 22 Example lf bits G1 and O1 are set to 1 input channel 1 will be adjusted when BFM 22 is written to by a TO instruction d Channels can be adjusted individually or together with the same gain and offset values e Offset and gain values in BFM 23 and 24 are in units of mV or m A Due to the resolution of the unit the actual response will be in steps of 5mV or 20 m A 4 Status Information BFM 29 When any of b1 to b4 is ON If any of b2 to b4 is ON A D conversion of all the channels is stopped b1 Offset gain error Omenaa oala ne F EPROM Offset Gain data normal is corrupted or adjustment error b2 Power source abnormality 24V DC power supply failure Power supply normal No error b3 Hardware error A D converter or other hardware Hardware Normal
17. ersonal safety and protect the integrity of equipment A 1 Indicates that the identified danger WILL cause physical and property damage Indicates that the identified danger could POSSIBLY cause physical and property damage Under no circumstances will Mitsubishi Electric be liable or responsible for any consequential damage that may arise as a result of the installation or use of this equipment 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 the actual use of the product based on these illustrative examples Owing to the very great variety in possible application for this equipment you must satisfy yourself as to its suitability for your specific application INTRODUCTION The FX2n 4AD analog special function block has four input channels The input channels receive analog signals and convert them into a digital value This is called an A D conversion The FX2n 4AD has maximum resolution of 12 bits The selection of voltage or current based input output is by user wiring Analog ranges of 10 to 10V DC resolution 5mV and or 4 to 20mA 20 to 20mA resolution 20 uA may be selected The FX2n 4AD can be connected to the FXon FX1n F X2n FXa2nc FX3u series Programmable Controllers PLC Data transfer between the FX2n 4AD and the main unit is by buffer memory exchange There are 32 buffer me
18. et by PLC programing 2 9 SET Mol Adjustment start Mo TO ko KO H0000 Ki H0000 BFM 0 input channels selection 7 K1 BFM 21 L TORE ko k21 ii ii J BFM 21 gain offset prohibition must be set to permission with b1 bO 0 1 KO gt BFM 22 offset gain adjustment L TORI KO oS Mo ai aI Reset adjustment bits TO i Z TOR Ko K23 Ko K1 H KO gt BFM 23 offset TOBY Ko 24 2500 K1 l K2500 gt BFM 24 gain H0003 gt BFM 22 orse gain adjustment TOBY ko K22 H0003 KS oodi e Ol 1 Qi Channel 1 is adjusted Da K4 T1 s RST MO End of adjustment ji J K2 BFM 21 TOB Ko Kar iK Kij BEM 21 gaio iserpriohibition 9 DIAGNOSTICS 9 1 Preliminary checks Check whether the input wiring and or extension cables are properly connected on the FX2N 4AD analog special function block Check that the PLC system configuration limits have not been exceeded i e the number of special function blocks and the total system I O are within the specified range Ensure that the correct operating range has been selected for the application IV Check that there is no power overload on either the 5V or 24V power sources remember the loading 9 on a main unit or a powered extension unit varies according to the number of extension blocks or special function blocks connected
19. mories each of 16 bits in the FX2n 4AD The FX2n 4AD occupies 8 I O points on the FX2n expansion bus The 8 I O points can be allocated from either inputs or outputs The FX2n 4AD draws 30mA from the 5V rail of the main unit or powered extension unit EXTERNAL DIMENSIONS Weight Approx 0 3 kg 0 66 Ibs 55 2 17 Dimensions mm inches 87 3 43 55 2 17 Mounting holes DIN rail Mounting slot 35mm 1 38 5 O O FXax 4AD dVv N2x4 Extension cable and connector 3 WIRING Voltage input OER GELAR cH HD y 100Ka Shielded AG Current input 20mA to 20mA CH1 100KQ V mi NV o Vi 4 0 Toko a Shielded FG i 15V DC24V_55mA Eom L T beme 7 7 7 Severed SOO 24 gt 15V Grounding i FX2n 4AD 100Q or less PLC Analog Input Block ae Extension cable 4 CONNECTION WITH PLC The analog input is received through a twisted pair shielded cable This cable should be wired separately from power lines or any other lines which may induce electrical noise If a voltage ripple occurs during input or there is electrically induced noise on the external wiring connect a smoothing capacitor of 0 1 to 0 47
20. ns 6 ALLOCATION OF BUFFER MEMORIES BFM 6 1 Buffer memories Contents Channel selection Default H0000 Channel 1 sem Contains the number of samples 1 to 4096 to be used for an Channel 2 averaged result Channel 3 The default setting is 8 normal speed High speed operation can be selected with a value of 1 Channel 4 Channel 1 Channel 2 These buffer memories contain the averaged input values for the number of samples entered for the channel in buffer Channel 3 memories 1 to 4 respectively Channel 4 Channel 1 Channel 2 These buffer memories contain the present value currently Channel 3 being read by each input channel When set to 0 a normal speed is selected of 15ms ch default Selection of A D 15 conversion speed see note 2 When set to 1 a high speed is selected of 6ms ch Offset Gain Adjust r 4 04 ea 08 2 02 G1 o Offset Value Default 0 Gain Value Default 5 000 Reserved In buffer memory locations BFMs marked with an data can be written from the PLC using the TO instruction For buffer memories BFMs without mark data can be read by the PLC using the FROM instruction Before reading from the analog special function block ensure that the appropriate settings have been sent to the analog special function block Otherwise the previous values held in the analog block will be used The buffer memory also gives a facility to adjust the offset and gain via s
21. oftware Offset intercept The analog input value when the digital output becomes 0 Gain slope The analog input value when the digital output becomes 1000 1 Channel Selection Channel selection is made by a 4 character HEX number HOOOO in buffer memory BFM 0 The least significant character controls channel 1 and the 4th character controls channel 4 Setting of each character is as follows O 0 Preset range 10V to 10V O 1 Preset range 4mA to 20mA Example H3310 CH1 Preset range 10V to 10V CH2 Preset range 4mA to 20mA CH3 CH4 Channel OFF 2 Analog to Digital Conversion Speed Change 2 Preset range 20mA to 20mA O O 3 Channel OFF By writing O or 1 to BFM 15 of the FX2N 4AD the speed at which A D conversion is performed can be changed However the following points should be noted To maintain a high speed conversion rate use the FROM TO instructions as seldom as possible NOTE When a conversion speed change is made BFM 1 4 are set to their default values immediately after the change This is regardless of the values they held originally Bear this in mind if a speed change will be made as part of the normal program execution 3 Adjusting Gain and Offset values a When buffer memory BFM 20 is activated by setting it to K1 all settings within the analog special function block are reset to their default settings This is a very quick method to erase any undesired gain and offset
22. r 0 or less default of 8 will be used Prohibit b1 bO of BFM 21 is set to 1 0 Averaging is normal b11 Averaging error between 1 and 4096 Permit b1 bO of BFM 21 is b12 Offset gain adjust prohibit set to 0 1 NOTE b4 to b7 b9 and b13 to b15 are undefined 5 Identification Code BFM 30 The identification or ID code number for a Special Function Block is read using the FROM instruction This number for the FX2N 4AD Special Function Block unit is K2010 The user s program in the PLC can use this facility in the program to identify the special function block before commencing data transfer from and to the special function block CAUTION e Values of BFM 0 23 and 24 are copied to the EEPROM memory of the FX2n 4AD BFM 21 and BFM 22 are only copied when data is written to the gain offset command buffer BFM 22 Also BFM 20 causes the resetting of the EEPROM memory The EEPROM has a life of about 10 000 cycles changes so do not use programs which frequently change these BFMs e Due to the time needed to write to the EEPROM memory a delay of 300 ms is required between instructions that cause a write to the EEPROM Therefore a delay timer should be used before writing to the EEPROM for a second time 7 DEFINING GAIN AND OFFSET Gain a b Offset d ce f 1 000 f Da i Pi oa a Digital we oa gl 9 Offset value 7 Gain value ene Analog gt
23. reset ranges are selected by an appropriate setting in the buffer memory of the analog block Current Voltage input selection must match the correct input terminal connections 6 ALLOCATION OF BUFFER MEMORIES BFM 6 1 Buffer memories Contents 0 Channel selection Default H0000 1 Channel Contains the number of samples 1 to 4096 to be used for an 2 Channel 2 averaged result 43 Channel 3 The default setting is 8 normal speed High speed operation can be selected with a value of 1 4 Channel 4 Channel 2 These buffer memories contain the averaged input values for the number of samples entered for the channel in buffer Channel 3 memories 1 to 4 respectively Channel 4 Channel 1 Channel 2 These buffer memories contain the present value currently Channel 3 being read by each input channel Channel 4 Selection of A D When set to 0 a normal speed is selected of 15ms ch default 15 conversion speed see note 2 When set to 1 a high speed is selected of 6ms ch Reset to Defaults and Preset Default Offset Gain Adjust Prohibit Default 0 1 P 22 Offset Gain Adjust b7 b6 bs a In buffer memory locations BFMs marked with an data can be written from the PLC using the TO instruction For buffer memories BFMs without mark data can be read by the PLC using the FROM instruction Before reading from the analog special function block ensure that the appropriate settings have been
24. rogram steps are not strictly needed to perform an analog read They are however a useful check and are recommended as good practice The analog input channels CH1 CH2 are setup by writing 7 H3300 to the BFM 0 of the FX2n 4AD CMP K2010 D4 M l TOBY ko Ko H3300 K1 Ko The number of averaged samples for CH1 and CH2 is set to 4 by writing 4 to the BFM 1 and 2 respectively Do not execute the pulse form of the instruction TO KO K1 K4 FROM KO K29 K4M10 Ki The operational status of the FX2n 4AD is read from BFM 29 L 4 and output as bit devices of the main unit es ues FROM KO K5 DO Ko If there are no errors in the operation of the FX2N 4AD then ok the averaged data BFM s are read NO Digital output error value is normal In the case of this example BFM 5 and 6 are read into the main unit and stored in DO and D1 These devices contain the averaged data for CH1 and CH2 respectively 8 2 Using gain and offset in a program The following is an example of changing the offset value on input channel CH1 to OV and the gain value to 2 5V The FX2N 4AD block is in the position of block No 0 i e closest to the main unit Example Adjusting gain offset by PLC programing em SET Mol Adjustment start MO TOM Ko KO H0000 K1 H0000 BFM 0 input channels selection E 7 K1
25. 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 1 Indicates that the identified danger WILL cause physical and property damage f 2 Indicates that the identified danger could POSSIBLY cause physical and property damage e Under no circumstances will Mitsubishi Electric be liable or responsible for any consequential damage that may arise as a result of the installation or use of this equipment 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 the actual use of the product based on these illustrative examples e Owing to the very great variety in possible application for this equipment you must satisfy yourself as to its suitability for your specific application 1 INTRODUCTION e The FX2n 4AD analog special function block has four input channels The input channels receive analog signals and convert them into a digital value This is called an A D conversion The FX2n 4AD has maximum resolution of 12 bits e The selection of voltage or current based input output is by user wiring Analog ranges of 10 to 10V DC resolution 5mV and or 4 to 20mA 20 to 20mA resolution 20 uA may be selected e The FXe2n 4AD can be connected to the FXon FX1N FXe2n FXa2nc FX3u series
26. uF 25V If you are using current input connect the V and I terminals to each other If there is excessive electrical noise connect the FG frame ground terminal with the grounded terminal on the FX2N 4AD In CH1 there is no FG terminal Use FG terminal of other channels Connect the ground terminal on the FX2N 4AD unit with the grounded terminal on the main unit Use grounding on the main unit if available The FX2N 4AD unit can be connected to the PLCs as follows Resrictions apply to the maximum number of connectable units depending on the DC24V DC5V Power Supply capacities and the Main Unit Special Function Unit types For details refer to the respective PLC manual FX2N FX3U The maximum connectable units is 8 To connect the FX2N 4AD with the FX2Nc main unit FX2NCc CNV IF is required FX2NC The maximum connectable units is 4 FX1N The maximum connectable units is 8 FXON The maximum connectable units is 4 5 SPECIFICATIONS 5 1 General specification General specifications Same as those for the main unit Dielectric withstand voltage 500V AC 1min between all terminals and ground 5 2 Performance specification and others Analog circuits 24V DC 10 55mA external power supply from the main unit Eo ee a 5V DC 30mA Digital circuits i internal power supply from main unit Photo coupler isolation between analog and digital circuits Isolation DC DC converter isolation of
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