Mitsubishi Electric MELSEC FX-2DA User Manual page 7

(5) Status information BFM #29
Bit
b 0 : error
b 1 : Offset/Gain error
b 2 : Power abnormality
b 3 : Hardware error
b 8 : Not READY
b10: Range error
b12: Offset/Gain adjust
prohibit
Bits b4 to b7, b9, b11 and b13 are undefined.
(6) Model code number BFM #30
The identification code for a Special Block is read using the FROM command.
The identification code for the FX-2DA unit is K3010.
The PC can use this facility in the program to identify the special block before commencing any data trans-
fer from and to the special block.
CAUTION
Values of BFM #0, #5, #21, #23 and #24 are stored in EEPROM memory of the FX-2DA. BFM #23
and BFM #24 are only copied when the gain/offset setting command BFM #22 is used. Also, BFM
#20 causes 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.
Because of the time needed to write to the EEPROM memory, a delay of 300ms is required between
instructions that cause a change to the EEPROM.
Therefore, a delay timer should be used before writing to the EEPROM a second time.
ON
When any of b1 to b3 is ON D/A conversion
is stopped for the error channel
Offset/Gain data in EEPROM is corrupted or
adjustment error
DC 24V power supply failure
D/A converter or other hardware failure
FX-2DA MODE switch is not set to READY.
Digital input value or analog output is outside
the specified range.
Prohibit-(b1, b0) of BFM #21 is set at (1, 0).
OFF
No error
Offset/Gain data normal
Power supply normal
Hardware normal
READY mode
Analog output value is normal.
Permit-(b1, b0) of BFM #21 is
set at (1, 0).