196
13 TROUBLESHOOTING
13.3 Troubleshooting by Symptom
When the ON/OFF state of an external output cannot be changed
Check the following items in order of No.
When an external output ON signal intermittently turns off
If operation is not performed normally even after the actions described above are taken, the possible cause is
a module failure. Please consult your local Mitsubishi representative.
No.
Check item
Action
1
Check whether the S MODE LED is on.
If the S MODE LED is not on, take action by referring to the following.
Page 194 When the S MODE LED is flashing or off
2
When the safety output is turned on, check whether the
corresponding output LED is on.
If the LED is on, there is a problem in the wiring between the external output
terminal and the external output device. Check the wiring again for any wire
break or short-circuit.
3
Check whether the safety device to which output data is set is
correct.
If data is set to a safety device different from the safety device assigned by the
refresh device setting, a safety output cannot be made correctly.
Check the refresh device setting, and make necessary corrections to make
the program content consistent. (
MELSEC iQ-R CPU Module User's
Manual (Application))
4
Check whether "Wiring output selection" is set to "Not used".
When "Not used" is set for "Wiring output selection", the relevant safety output
is always OFF. Change the "Wiring output selection" setting according to the
actual wiring.
5
Check whether the PROGRAM RUN LED of the SIL2 Process CPU
is on.
If the PROGRAM RUN LED of the SIL2 Process CPU is not on, the SIL2
Process CPU may be in STOP state and the program may not be operating.
Check the RUN/STOP/RESET switch for the SIL2 Process CPU and if it is set
to STOP, change it to RUN.
Check item
Action
Check whether an output dark test has been conducted.
Check the specifications of the safety device to be used, and review the
settings for "Output dark test pulse OFF time" and "Number of pulses output
for output dark test".
Содержание MELSEC iQ-RX40NC6B
Страница 1: ...MELSEC iQ R I O Module With Diagnostic Functions User s Manual Application RX40NC6B RY40PT5B ...
Страница 2: ......
Страница 125: ...4 OVERVIEW 123 4 MEMO ...
Страница 191: ...12 MAINTENANCE AND INSPECTION 189 12 MEMO ...
Страница 227: ......