FX2N-4AD USER'S GUIDE
Contents
1. The FX2n 4AD occupies 8 points of I O on the FX2n expansion bus The 8 points can be allocated from either inputs or outputs The FX2n 4AD draws 30mA from the 5V rail of the FX2n main unit or powered extension unit 1 1 EXTERNAL DIMENSIONS Weight Approx 0 3 kg 0 66 lbs Dimensions mm inches 87 3 43 55 2 17 55 2 17 Mounting holes 4 5mm 0 18 dia DIN rail Mounting slot 35mm 1 38 90 3 54 80 3 15 FXan 4AD GVv N2x4 Extension cable and connector 4 A DLED 24VLED Terminal screws M3 0 12 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 Voltage input 10V to 10V Ifa voltage ripple occurs during input or there is electrically induced noise on the external wiring connect a smoothing capacitor of 0 1 to 0 47uF 25V Shielded Current input 20mA to 20mA If you are using current input connect the V and l terminals to each other Shielded DC24V 55mA lf there is excessive electrical noise connect the FG frame ground terminal with the grounded terminal on the FX2n 4AD Connect the ground terminal on the FX2n 4AD unit with the grounded terminal on the main un2. Digital output S PROUN senesan i iS ae lt D 10V u i i I a 10V Digital i gt I gt output O fi I I I 7 Voltage input gt f 1 000 oO i i Tii 0 4mA 20mA Z gt a P 1 600 Current input 2 048 urrent input NOTE Preset ranges are selected by an appropriate setting in buffer memory of the analog block Current Voltage input selection must match the correct input terminal connections Miscellaneous Item Specification Photo coupler isolation between analog and digital circuits Isolation DC DC converter isolation of power from FX2n MPU No isolation between analog channels 8 points taken from the FX2n expansion bus Number ofocc pied NO points can be either inputs or outputs 3 4 Allocation of buffer memories BFM BEM Contents In buffer memory locations BFMs z EE marked with an data can be written 0 Channel initialization Default H0000 from the PC using the TO command 1 Channel 1 Contains the number of samples 1 to HO Channel 2 4096 to be used for an averaged result H3 Ch 13 The default setting is 8 normal speed High For buff ies BFM ithout ang speed operation can be selected with a or buffer memories BFMs without HA Channel 4 value of 1 mark data can be read to the PC using 45 Channel the FROM command These buffer memories contain the 6 Channe
3. 0 initialize input channels Enter the instructions on the left and RUN the PC K1 BFM 21 BFM 21 gain offset adjust prohibit must be set to permit with b1 bO 0 1 KO gt BFM 22 offset gain adjust Reset adjust bits KO gt BFM 23 offset K2500 BFM 24 gain H0003 gt BFM 22 offset gain adjust 3 0011i e O1 1 Gl 1 Therefore channel 1 is adjusted Adjustment end K2 BFM 21 BFM 21 gain offset adjust prohibit DIAGNOSTICS 6 1 Preliminary checks Check whether the input wiring and or extension cables are properly connected on FX2n 4AD analog special function block Il Check that the FX2n system configuration rules have not been broken i e the number of special function blocks does not exceed 8 and the total system I O is equal or less than 256 I O 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 FX2n main unit or a powered extension unit varies according to the number of extension blocks or special function blocks connected V Put the FX2n main unit into RUN 6 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
4. 2 s complement form BFM Contents 0 Channel initialization Default H0000 1 Channel 1 Contains the number of samples 1 to HO Channel 2 4096 to be used for an averaged result 49 Ch 13 The default setting is 8 normal speed High aus speed operation can be selected with a 4 Channel 4 value of 1 9 Channel 1 These buffer memories contain the 6 Channel 2 averaged input values for the number of 7 Channel 3 samples entered for the channel in buffer 8 Channel 4 memories 1 to 4 respectively 9 Channel 1 10 Channel 2 These buffer memories contain the present value currently being read by each input 11 Channel 3 channel 12 Channel 4 13 14 Reserved When set to 0 a normal speed is selected Selection of A D of 15ms ch default 15 conversion speed see note 2 When setto 1 a high speed is selected of 6ms ch BFM b7 b6 b5 b4 b3 b2 b1 b0 16 19 Reserved 20 Reset to Defaults and Preset Default 0 21 Offset Gain Adjust Prohibit Default 0 1 Permit 22 Offset Gain Adjust G4 04 G3 03 G2 O02 G1 01 23 Offset Value Default 0 24 Gain Value Default 5 000 25 28 Reserved 29 Error status 30 Identification code K2010 31 Cannot be used Resolution 5mV 10V default range 1 2000 20uA 20mA default range 1 1000 Over all accuracy 1 for the range of 10V to 10V 1 for the range of 20mA to 20mA Conversion speed 15ms channel Normal speed 6m
5. BFM 0 The least significant character controls channel 1 and the 4 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 0 or 1 into 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 commands as seldom as possible NOTES 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 adjustments b If b1 b0 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 b0 must be set to 0 1 The default is 0 1 c Gai
6. and stored at D4 in the main unit This is compared to check the block is a FX2n 4AD if OK M1 is turned ON These two program 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 H3300 to BFM 0 of the FX2n 4AD The number of averaged samples for CH1 and CH2 is set to 4 by writing 4 to BFM 1 and 2 respectively The operational status of the FX2n 4AD is read from BFM 29 and output as bit devices at the FX2n main unit If there are no errors in the operation of the FX2n 4AD then the averaged data BFM s are read In the case of this example BFM 5 and 6 are read into the FX2n main unit and stored at DO and D1 These devices contain the averaged data for CH1 and CH2 respectively Only the gain and offset values in the memory of the FX2n 4AD need be adjusted A voltmeter or an ammeter for the analog input is not needed A program for the PC will be needed however 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 FX2n main unit Example Adjusting gain offset via software settings X010 MO TOR KO TOR KO TOR KO TORI Ko KO K21 K22 K21 SET Mo H0000 K1 Ki KI KO KI RST Mo K2 KI H Adjustment start H0000 gt BFM
7. blocks or special function blocks connected V Put the FX2n main unit into RUN 6 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 fo 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 fo 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 62 and b3 are ON then this is why the A D LED is OFF Guidelines for the safety of the user and protection of the FX2n 4AD special function block e This manual has been written to be used by trained and competent personnel This is defined by the European directives for machinery low voltage and EMC e lf in doubt at any stage during the installation of the FX2N 24AD always consult a professional electrical engineer who is qualified and trained to the local and national standards If in doubt about the operation or use of the FX2N 4AD please consult the nearest Mitsubishi Electric distributor e Under no circumstances will Mitsubishi Electric be liable or responsible for any con
8. c Large gain Small steps in digital readings f Positive offset Offset and gain can be set independently or together Reasonable offset ranges are 5 to 5V or 20mA to 20mA and gain values 1V to 15V or 4mA to 32mA Gain and offset can be adjusted by software in the FX2n main unit See program example 2 Bit device s b1 b2 of the gain offset BFM 21 should be set to 0 1 to allow adjustment Once adjustment is complete these bit devices should be set to 1 0 to prohibit any further changes Channel initialization BFM 0 should be set to the nearest range i e voltage current etc EXAMPLE PROGRAM 5 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 Averaging is set at 4 and data registers DO and D1 of the PC receive the averaged digital data M8002 TO KO initial pulse CMP M TOR ko TOR ko FROM KO 10 M20 1 M ae FROM KO NO Digital output error value is normal K30 K2010 KO K1 K29 K5 D4 KI D4 MO H3300 K1 K4 K2 K4M10 Ki DO K2 5 2 Using gain and offset in a program The gain and offset of the FX2n 4AD can be adjusted using push button switches on the input terminal of the PC It can also be adjusted using software settings sent from the PC The ID code for the special function block at position O is read from BFM 30 of that block
9. of the extension cable Check the external wiring Check the status fo 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 fo 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 Guidelines for the safety of the user and protection of the FX2n 4AD special function block e This manual has been written to be used by trained and competent personnel This is defined by the European directives for machinery low voltage and EMC e fin doubt at any stage during the installation of the FX2n 24AD always consult a professional electrical engineer who is qualified and trained to the local and national standards If in doubt about the operation or use of the FX2n 4AD please consult the nearest Mitsubishi Electric distributor 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 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 illustrativ
10. 11 Averaging error 5 Identification Code BFM 30 The identification or ID code number for a Special Function Block is read using the FROM command This number for the FX2n 4AD unit is K2010 The user s program in the PC 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 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 writing to 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 Because of 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 a second time DEFINING GAIN AND OFFSET Gain Offset d e f Digital I Offset value Analog gt Gain value Analog gt Gain determines the angle or slope of the calibration line Offset is the Position of the calibrated line identified at a identified at a digital value of 1000 digital value of 0 a Small gain Large steps in digital readings d Negative offset b Zero gain default 5V or 20mA e Zero offset default OV or4mA
11. HH FROM KO K5 DO NO Digital output error value is normal 5 2 Using gain and offset in a program The ID code for the special function block at position O is read from BFM 30 of that block and stored at D4 in the main unit This is compared to check the block is a FX2N 4AD if OK M1 is turned ON These two program 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 H3300 to BFM 0 of the FX2n 4AD The number of averaged samples for CH1 and CH2 is set to 4 by writing 4 to BFM 1 and 2 respectively The operational status of the FX2n 4AD is read from BFM 29 and output as bit devices at the FX2n main unit If there are no errors in the operation of the FX2N 4AD then the averaged data BFM s are read In the case of this example BFM 5 and 6 are read into the FX2n main unit and stored at DO and D1 These devices contain the averaged data for CH1 and CH2 respectively The gain and offset of the FX2nN 4AD can be adjusted using push button switches on the input terminal of the PC It can also be adjusted using software settings sent from the PC Only the gain and offset values in the memory of the FX2N 4AD need be adjusted A voltmeter or an ammeter for the analog input is not needed A program for the PC will be needed however The following is an example of changing the offset value on input c
12. a MITSUBISHI PROGRAMMABLE CONTROLLERS MdleLSlelb lF ADVANCED AND EVER ADVANCING MITSUBISHI ELECTRIC FX2n 4AD SPECIAL FUNCTION BLOCK USER S GUIDE JY992D65201A 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 FX2n SERIES HARDWARE MANUAL 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 5mV and or 4 to 20mA 20 to 20mA resolution 20uA Data transfer between the FX2n 4AD and the FX2n main memories each of 16 bits in the FX2n 4AD by user wiring Analog ranges of 10 to 10V DC resolution may be selected unit is by buffer memory exchange There are 32 buffer The FX2n 4AD occupies 8 points of I O on the FX2n expansion bus The 8 points can be allocated from either inputs or outputs The FX2n 4AD draws 30mA from the 5V rail of the FX2n main unit or powered extension unit 1 1 EXTERNAL DIMENSIONS Weight Approx 0 3 kg 0 66 Ibs 87 3 43 Mounting holes 4 5mm 0 18 dia Dim
13. ain Offset e A Digital I Offset value Analog gt Gain value Analog gt Gain determines the angle or slope of the calibration line Offset is the Position of the calibrated line identified at a identified at a digital value of 1000 digital value of 0 a Small gain Large steps in digital readings d Negative offset b Zero gain default 5V or 20mA e Zero offset default OV or4mA c Large gain Small steps in digital readings f Positive offset Offset and gain can be set independently or together Reasonable offset ranges are 5 to 5V or 20mA to 20mA and gain values 1V to 15V or 4mA to 32mA Gain and offset can be adjusted by software in the FX2n main unit See program example 2 Bit device s b1 b2 of the gain offset BFM 21 should be set to 0 1 to allow adjustment Once adjustment is complete these bit devices should be set to 1 0 to prohibit any further changes Channel initialization BFM 0 should be set to the nearest range i e voltage current etc 5 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 Averaging is set at 4 and data registers DO and D1 of the PC receive the averaged digital data M8002 TO KO K30 D4 initial pulse CMP K2010 D4 M TORI Ko KO H3300 TORY ko K1 K4 FROM KO K29 K4M10 10 M20 1 M
14. e analog special function block are reset to their default settings This is a very quick method to erase any undesired gain and offset b adjustments 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 b0 must be set to 0 1 The default is 0 1 Gain and offset values of BFM 23 and 24 are sent to non volatile memory gain and offset registers of the specified input channels Input channels to be adjusted are specified by the appropriate G O gain offset bits of BFM 22 Example If bits G1 and O1 are set to 1 input channel 1 will be adjusted when BFM 22 is written to by a TO instruction Channels can be adjusted individually or together with the same gain and offset values Gain and offset values in BFM 23 24 are in units of mV or uA Due to the resolution of the unit the actual response will be in steps of 5mV or 20A 4 Status Information BFM 29 Bit devices of BFM 29 ON OFF When any of b1 to b4 is ON bO Error If any of b2 to b4 is ON A D conversion of No error all the channels is stopped Offset Gain data in EEPROM is corrupted or adjustment error Offset Gain data normal b1 Offset gain error b2 Power source abnormality 24V DC power supply failure Power supply normal b3 Hardware error A D converter or other hardware failure Hardware Norma
15. e examples Manual number JY992D65201 Manual revision A Date JUNE 1997 Aa MITSUBISHI ELECTRIC CORPORATION HEAD OFFICE MITSUBISHI DENKI BLDG MARUNOUCHI TOKYO 100 TELEX J24532 CABLE MELCO TOKYO HIMEJI WORKS 840 CHIYODA CHO HIMEuI JAPAN Effective JUN 1997 Specifications are subject to JY992D65201A change without notice ADVANCED AND EVER ADVANCING MITSUBISHI ELECTRIC a MITSUBISHI PROGRAMMABLE CONTROLLERS MdleLSlelb lF FX2n 4AD SPECIAL FUNCTION BLOCK USER S GUIDE JY992D65201A 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 FX2n SERIES HARDWARE MANUAL 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 20uA may be selected Data transfer between the FX2n 4AD and the FXe2n main unit is by buffer memory exchange There are 32 buffer memories each of 16 bits in the FX2n 4AD
16. ensions mm inches 55 2 17 55 2 17 FXan 4AD GVv N2x4 DIN rail J Mounting slot ge 35mm 1 38 ols oOo V Extension cable 9 0 35 and connector 4 A DLED 24VLED Terminal screws M3 0 12 TERMINAL LAYOUTS Voltage input 10V to 10V Shielded Current input 20mA to 20mA Shielded DC24V 55mA Class 3 Grounding i PC _ 100Wor less Extension cable FXen 4AD Analog Input Block 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 47uF 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 Connect the ground terminal on the FX2n 4AD unit with the grounded terminal on the main unit Use class 3 grounding on the main unit if available INSTALLATION NOTES AND USAGE 3 1 Environment specification Item Specification Environmen
17. hannel 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 FX2n main unit Example Adjusting gain offset via software settings SET MO TOR KO KO H0000 K1 TOBY Ko K22 KO KI RST MO TORI ko k21 K2 K1 Adjustment start H0000 gt BFM 0 initialize input channels Enter the instructions on the left and RUN the PC K1 BFM 21 BFM 21 gain offset adjust prohibit must be set to permit with b1 bO 0 1 KO gt BFM 22 offset gain adjust Reset adjust bits KO BFM 23 offset K2500 gt BFM 24 gain H0003 gt BFM 22 offset gain adjust 3 0011i e O1 1 Gi 1 Therefore channel 1 is adjusted Adjustment end K2 BFM 21 BFM 21 gain offset adjust prohibit DIAGNOSTICS 6 1 _Preliminary checks Check whether the input wiring and or extension cables are properly connected on FX2n 4AD analog special function block Il Check that the FX2n system configuration rules have not been broken i e the number of special function blocks does not exceed 8 and the total system I O is equal or less than 256 I O 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 FX2n main unit or a powered extension unit varies according to the number of extension
18. it Use class 3 grounding on the main unit if available Class 3 Grounding i PC _ 100Wor less Extension cable FXen 4AD Analog Input Block 3 4 Allocation of buffer memories BFM 3 1 Environment specification INSTALLATION NOTES AND USAGE Item Specification Environmental specifications excluding following Same as those for the FX2n main unit Dielectric withstand voltage 500VAC 1min between all terminals and ground 3 2 Power supply specification Item Specification Analog circuits 24V DC 10 55mA external power supply from main unit Digital circuits 5V DC 30mA internal power supply from main unit 3 3 Performance specification Analog Inputs Item 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 Analog input range DC 10V to 10V input resistance 200kQ Warning this unit may be damaged by input voltage in excess of 15V DC 20mA to 20mA input resistance 250Q Warning this unit may be damaged by input currents in excess of 32mA Digital output Maximum value 2047 Minimum value 2048 12 bit conversion stored in 16 bit
19. l Digital output value is less than 2048 or b10 Digital range error sore than 2047 Digital output value is normal Number of averaging samples is 4097 or Averaging is normal b11 Averaging error more or 0 or less default of 8 will be used between 1 and 4096 b12 Offset gain adjust prohibit Prohibit b1 b0 of BFM 21 is set to 1 0 Permit 61 bO of BFM 21 is 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 command This number for the FX2n 4AD unit is K2010 The user s program in the PC 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 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 writing to 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 Because of 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 a second time DEFINING GAIN AND OFFSET G
20. l 2 averaged input values for the number of 7 Channel 3 samples ae d the A in buffer Before reading from the analog special 8 Channel 4 memories 1 to 4 respectively function block ensure these settings 9 Channel 1 have been sent to the analog special 10 Channel 2 These buffer memories contain the present function block Otherwise the previous value currently being read by each input values held in the analog block will be 11 Channel 3 channel used 12 Channel 4 13 14 Reserved When set to 0 a normal speed is selected Selection of A D of 15ms ch default 15 conversion speed see note 2 When set to 1 a high speed is selected of 6ms ch BFM b7 b6 b5 b4 b3 b2 b1 bO The buffer memory also gives a facility 16 19 Reserved to adjust offset and gain by software 20 Reset to Defaults and Preset Default 0 21 Offset Gain Adjust Prohibit Default 0 1 Permit Offset intercept The analog input value when the digital output becomes 0 22 Offset Gain Adjust G4 04 G3 O3 G2 02 G1 O1 23 Offset Value Default 0 24 Gain Value Default 5 000 25 28 Reserved Gain slope The analog input value when the digital output becomes 1000 29 Error status 30 Identification code K2010 31 Cannot be used 1 Channel Selection Channel initialization is made by a 4 character HEX number HOOOO in buffer memory
21. n and offset values of BFM 23 and 24 are sent to non volatile memory gain and offset registers of the specified input channels Input channels to be adjusted are specified by the appropriate G O gain offset bits of BFM 22 Example If bits G1 and O1 are setto 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 Gain and offset values in BFM 23 24 are in units of mV or uA Due to the resolution of the unit the actual response will be in steps of 5mV or 20A 4 Status Information BFM 29 Bit devices of BFM 29 ON OFF When any of b1 to b4 is ON bO Error If any of b2 to b4 is ON A D conversion of No error all the channels is stopped Offset Gain data in EEPROM is corrupted or adjustment error b1 Offset gain error Offset Gain data normal b2 Power source abnormality 24V DC power supply failure Power supply normal b3 Hardware error A D converter or other hardware failure Hardware Normal b10 Digital range error are aa is less than 2048 or Digital output value is normal Number of averaging samples is 4097 or Averaging is normal more or 0 or less default of 8 will be used between 1 and 4096 b12 Offset gain adjust prohibit Prohibit b1 b0 of BFM 21 is set to 1 0 Permit 61 b0 of BFM 21 is set to 0 1 NOTE b4 to b7 b9 and b13 to b15 are undefined b
22. ock Otherwise the previous values held in the analog block will be used The buffer memory also gives a facility to adjust offset and gain by 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 Channel initialization is made by a 4 character HEX number HOOOO in buffer memory BFM 0 The least significant character controls channel 1 and the 4 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 O O 3 Channel OFF 2 Preset range 20mA to 20mA By writing 0 or 1 into 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 commands as seldom as possible NOTES 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 th
23. s channel High speed Analog Inputs continued Preset 0 10V to 10V Preset 1 4mA to 20mA Preset 2 20mA to 20mA Digital output I I I gt oO st N l Oo T ry 2 000 Voltage input _ 2 047 2 ei Ree es qa 1 ILO 1 10 1 1 000 11O I oe 10V Digital gt output i 0 4mA 20mA Ee Current input 7 Digital Lees 1 600 _ output en i a Me i 1 000 g 1 I IN l 109 E 20mA po 2 rt 20mA l l N l 9 J 1 000 Current input NOTE Preset ranges are selected by an appropriate setting in buffer memory of the analog block Current Voltage input selection must match the correct input terminal connections Miscellaneous Item Specification Photo coupler isolation between analog and digital circuits Isolation DC DC converter isolation of power from FX2n MPU No isolation between analog channels Number of occupied I O points 8 points taken from the FX2n expansion bus can be either inputs or outputs 1 Channel Selection In buffer memory locations BFMs marked with an data can be written from the PC using the TO command tk For buffer memories BFMs without mark data can be read to the PC using the FROM command Before reading from the analog special function block ensure these settings have been sent to the analog special function bl
24. sequential 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 Manual number JY992D65201 Manual revision A Date JUNE 1997 a a MITSUBISHI ELECTRIC CORPORATION HEAD OFFICE MITSUBISHI DENKI BLDG MARUNOUCHI TOKYO 100 TELEX J24532 CABLE MELCO TOKYO HIMEJI WORKS 840 CHIYODA CHO HIMEJI JAPAN Effective JUN 1997 Specifications are subject to JY992D65201A change without notice
25. tal specifications excluding following Same as those for the FX2n main unit Dielectric withstand voltage 500VAC 1min between all terminals and ground 3 2 Power supply specification Item Specification 24V DC 10 55mA Analog circuits external power supply from main unit Digital circuits 5V DC 30mA internal power supply from main unit 3 3 Performance specification Analog Inputs Voltage input Current input Item 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 input resistance 200kQ DC 20mA to 20mA input resistance Analog input range Warning this unit may be damaged by input 2509 Warning this unit may be damaged voltage in excess of 15V by input currents in excess of 32mA 12 bit conversion stored in 16 bit 2 s complement form Maximum value 2047 Minimum value 2048 Resolution 5mV 10V default range 1 2000 20uA 20mA default range 1 1000 Digital output Over all accuracy 1 for the range of 10V to 10V 1 for the range of 20mA to 20mA Conversion speed 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 2 047 1 750 oa 1 600 Sie ee higa cae Serre te Peg output 1 ILO l l 119 1 000 E
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