10 TROUBLESHOOTING
10.4 Troubleshooting by Symptom
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10.4 Troubleshooting by Symptom
This section describes troubleshooting for each phenomenon. Perform the troubleshooting by symptom when the safety
remote I/O module does not operate properly with no error.
When an error has occurred in the safety remote I/O module, check the engineering tool or the status of the master station,
and identify the cause of the error.
When the ON/OFF status of an external input cannot be read
When the ON/OFF status of an external output cannot be changed
When External output ON signal intermittently turns off
Check item Action
Is the SAFETY LED on? When the SAFETY LED is not on, the safety module validation has not been performed or the CPU module is in
the safety station interlock status. Take the following actions.
• Perform the safety module validation. ( Page 72 Parameter Settings)
• Fully check wiring and connection, and cancel the safety station interlock of the CPU module. ( MELSEC
iQ-R CPU Module User's Manual (Application))
Is the corresponding X LED of the input
module on when an external input device is
on?
If the LED does not turn on, there is a problem on the input wiring. Check the wiring confirming that the input
wiring is not disconnected or short-circuited, or the voltage of the input signal is correct. ( Page 20
Performance Specifications, Page 129 Input circuit troubles and corrective actions)
Is the setting of the refresh device (SA\X/
SA\Y) correct?
Check and correct the device setting of the safety communication setting so that the setting of the refresh device
(SA\X/SA\Y) matches the setting in the program. ( MELSEC iQ-R CC-Link IE Field Network User's Manual
(Application))
Is there any incorrect setting in the wiring
selection of input?
Review the settings in the wiring selection of input. ( Page 85 Safety input wiring selection function)
Check item Action
Is the SAFETY LED on? When the SAFETY LED is not on, the safety module validation has not been performed or the CPU module is in
the safety station interlock status. Take the following actions.
• Perform the safety module validation. ( Page 72 Parameter Settings)
• Fully check wiring and connection, and cancel the safety station interlock of the CPU module. ( MELSEC
iQ-R CPU Module User's Manual (Application))
Is the corresponding LED (Y0 LED to Y7
LED) of the output module on?
If the LED turns on, there is a problem on the output wiring. Check the wiring confirming that the output wiring is
not disconnected or short-circuited. Refer to the following as well.
Page 131 Output circuit troubles and corrective actions
Is the setting of the refresh device correct? Check and correct the refresh parameter so that the setting of the refresh device matches the setting in the
program. For the settings of the refresh parameter areas, refer to the following.
MELSEC iQ-R CC-Link IE Field Network User's Manual (Application)
Is there any incorrect setting in the wiring
selection of output?
Review the settings in the wiring selection of output.
Page 89 Safety output wiring selection function
Are the outputs interlocked? When "Operation setting of external power supply voltage error detection" of the module parameter is set to "2:
Continue safety communication (With output interlock)", check that the outputs are not interlocked. If the outputs
are interlocked, follow the procedure to cancel the interlock.
Page 110 Operation Setting Function at Detection of External Power Supply Voltage Error
Check item Action
Is an output dark test being executed? Check the specifications of the safety devices used, and review the setting of the output dark test pulse OFF
time.
Page 105 Output dark test function
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