Mitsubishi Electric Q66DA-G, User Manual

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8
- 4 8.2 Troubleshooting
8.2.4 When an analog output value is not output
8
TROUBLESHOOTING
8.2.4 When an analog output value is not output
If the analog output value is not output after the proper corrective action is taken in
accordance with the above check item, the possible cause is a module failure.
Please consult your local Mitsubishi representative.
Check item Action to be taken
Is 24VDC being supplied from the external power supply? (If not,
“External power supply (X7)” is off.)
Verify that 24VDC voltage is being supplied to the external power
supply terminals (between terminals No. A19 and A20 or B19 and
B20).
Is there any fault with the analog signal lines such as broken or dis-
connected line? Check for any abnormality on the signal lines by a visual check and a
continuity check.
Is the CPU module in the STOP status? Set the CPU module to the RUN status.
Are the offset/gain settings correct?
Verify that the offset/gain settings are correct (Refer to sections 4.6
and 5.6.2).
If the user range setting is being used, switch to a different default
output range and check if D/A conversion is correctly performed. If it
is correctly performed, redo the offset/gain settings.
Is the output setting range correct?
Verify Setting range (Un\G20, Un\G21) in GX Developer monitor. If
the output range setting is incorrect, redo GX Developer intelligent
function module switch settings (Refer to Section 4.5).
Is the resolution mode setting correct?
Check the on/off status of High resolution mode status flag (X8) in GX
Developer system monitor.
If the resolution mode setting is incorrect, redo the GX Developer
intelligent function module switch setting. (Refer to Section 4.5).
Is the D/A conversion enable/disable setting for the channel to be
output set to Disable?
Check D/A conversion enable/disable setting (Un\G0) in GX Devel-
oper monitor and set it to Enable using the sequence program or util-
ity package (Refer to Section 3.4).
Is the D/A output enable/disable setting for the channel to be output
set to Disable?
Verify on/off for CH Output enable/disable flag (Y1 to Y6) in GX
Developer monitor.
If Output enable/disable flag are off, review the initial setting for the
sequence program or utility package (Refer to Section 3.3).
Is the digital value being written to the channel to be output?
Verify CH Digital value (Un\G1 to Un\G6) in GX Developer monitor
(Refer to Section 3.4).
Has Operating condition setting request (Y9) been executed?
Set Operating condition setting request (Y9) from on to off from GX
Developer and check to Refer to if the analog output is normal.
If normal analog output is obtained, review the initial setting for the
sequence program or utility package (Refer to Section 3.3).