Mitsubishi Electric MELSEC iQ-F FX5 User Manual page 274

Check item
Checking the program
The analog output value is not identical with the previous value/setting value
Check item
Check whether the operation status of the CPU module is STOP or Stop Error.
Check whether the analog output HOLD/CLEAR function is correct.
Check whether the CH HOLD setting value is correct.
'External power supply READY flag' (Un\G69, b7) does not turn on
Use the following procedure for checking.
Check item
Check whether the 24 V DC external power supply is supplied.
(1) Wiring is proper.
(2) External power supply 24 V DC is supplied within the specified range.
Other than the above
If the external power supply does not operate normally after the above actions are taken, the analog output
module may be in failure. Please consult your local Mitsubishi representative.
2 FX5-4DA
272
2.10 Troubleshooting
For the desired channel for wave output, check
whether the CH D/A conversion enable/
disable is set to D/A conversion disable.
Check whether 'Operating condition setting
request' (Un\G70, b9) has been executed.
Check whether the value is written in the wave
data registry area of the desired channel for
wave output.
Check whether the CH Wave output start/stop
request of the desired channel for wave output
is set to Wave output stop request (0).
For the desired channel for wave output, check
whether 'CH Output enable/disable flag'
(Un\G70, b1 to b4) is set to OFF.
Action
Check CH D/A conversion enable/disable setting to set to D/A conversion
enable.
By turning offonoff 'Operating condition setting request' (Un\G70, b9),
enable the wave output function parameter setting.
Check the value of the wave data registry area used for the desired channel
for wave output.
By pausing the wave output, each monitor of the wave output function can be
checked.
Set the analog output HOLD/CLEAR setting to the previous value, set the
CH Wave output start/stop request to the wave output pause request (2) to
pause the analog output state, and check each monitor.
Check the CH Wave output status monitor of the desired channel for wave
output.
When the CH Wave output status monitor is Wave output stopped (0), retry
to set CH Wave output start/stop request in Wave output start request (1).
Check the status of the ON/OFF setting of 'CH Output enable/disable flag'
(Un\G70, b1 to b4).
If 'CH Output enable/disable flag' (Un\G70, b1 to b4) is off, review the
program.
Corrective action
Check the CPU module operating status.
The analog output HOLD/CLEAR function is enabled when the CPU module
operating status is STOP or Stop Error.
Check the CH HOLD/CLEAR function setting monitor.
If the setting is incorrect, retry to set the analog output HOLD/CLEAR setting
to the previous value/setting value by setting GX Works3 module parameters.
If the setting value is selected with the analog output HOLD/CLEAR function
setting function, check the value the CH HOLD setting value.
Corrective action
(1) Make wiring by reference to the external wiring. (Page 239)
(2) Supply 24 V DC within the performance specifications. (Page 177)
The analog output module may be in failure. Please consult your local
Mitsubishi representative.