Mitsubishi Electric MELSEC iQ-R Series User Manual page 126

Description
■Step 3: Checking the output range setting
Check whether the output range
appropriate to the analog output is set.
*1 Monitor the buffer memory areas using "Device/Buffer Memory Batch Monitor" or "Intelligent Function Module Monitor".
*2 The status of external power supply 24VDC can be checked with 'External power supply READY flag' (X7) as well. ( Page 137
External power supply READY flag)
If the analog output value does not come out even after the above actions are taken, the D/A converter
module may have failed. Please consult your local Mitsubishi representative.
Check item 1
The write program is incorrect, or the CPU module is in STOP status. Check the following items.
Check item
Check whether the program to write a digital value is correct.
Check whether the auto refresh setting is correct.
Check whether the CPU module is in the STOP state.
Check item 2
The external power supply 24VDC is not supplied. Check the following items.
Check item
Check whether the external power supply 24VDC is supplied.
(1) Is the external power supply correctly wired?
(2) Is the external power supply 24VDC supplied within the
specified range?
The case other than the above
3 TROUBLESHOOTING
124
3.3 Troubleshooting by Symptom
Procedure
Ó
Check the value stored in 'CH1 Range
setting monitor' (Un\G430).
Is the set output range
matched with the analog
output?
NO
The analog output is not matched with the
output range setting.
Check item 6
Action
Check 'CH1 Digital value' (Un\G460) using the monitor functions of the engineering tool
("Device/Buffer Memory Batch Monitor" or "Intelligent Function Module Monitor"). If the
value is not stored as set, correct the write program.
If the stored value in the device of the CPU module is transferred to 'CH1 Digital value'
(Un\G460) using auto refresh, check that the auto refresh setting is correct.
Change the state of the CPU module to RUN.
Action
(1) Wire the external power supply by referring to the "External Wiring" described in the
manual. ( MELSEC iQ-R High Speed Digital-Analog Converter Module User's
Manual (Startup))
(2) Supply 24VDC within the range of the performance specifications. ( MELSEC iQ-
R High Speed Digital-Analog Converter Module User's Manual (Startup))
The possible cause is a failure of the D/A converter module. Please consult your local
Mitsubishi representative.
Monitor the buffer memory area with the
*1
monitor function of the engineering tool.
Check and correct the wiring and offset/gain
setting.
YES
Check item 5