When The Alm Led Is Flashing; When An I/O Led Does Not Change; When A Module Parameter Error Is Displayed In The "Module Diagnostics" Window; When The On/Off State Of An External Input Cannot Be Read - Mitsubishi Electric MELSEC iQ-RX40NC6B Application User's Manual

When the ALM LED is flashing

Check item
Check whether the system was restarted after the activation of the safety
module.

When an I/O LED does not change

Check item
Check whether "Display I/O status and error switching (1 second interval)" or
"Always display I/O error" is set in "LED display settings during an error" of the
input module with diagnostic functions.
Check whether "Display I/O status and error switching (1 second interval)" or
"Always display I/O error" is set in "LED display settings during an error" of the
output module with diagnostic functions.
When a module parameter error is displayed in the "Module
Diagnostics" window
Check item
Check whether the module configuration is correct.
Check whether a module incompatible with the SIL2 mode is not used.

When the ON/OFF state of an external input cannot be read

Check the following items in order of No.
No. Check item
1 Check whether the S MODE LED is on.
2 When the external input signal is on, check whether the
corresponding input LED is on.
3 Check whether the read safety device is correct.
4 Check whether "Wiring input selection" is set to "Not used".
5 Check whether two signals of double input wiring match.
Action
When the safety module is enabled, restart the system.
Action
Check the current setting of "LED display settings during an error".
Action
Check that the module configuration is the same as the one set with the
engineering tool.
Check that modules whose firmware version are compatible with the SIL2
mode are used. Incompatible modules do not operate normally in SIL2 mode.
For details, refer to the following.
Page 141 Firmware Version for SIL2 Mode
Action
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
If the LED is not on, check again the wiring between the external input device
and the module's external input terminal. Also check that the voltage of the
module's external power supply is within the rated input voltage range.
If a safety device different from the safety device assigned by the refresh
device setting is referred to, the safety device cannot be read 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))
When "Not used" is set for "Wiring input selection", the relevant safety input is
always OFF. Change the "Wiring input selection" setting according to the
actual wiring.
When "Wiring input selection" is set to "Redundant (NC/NC)", as long as the
levels of two paired input signals do not match, a state of the safety input level
being different from the actual input signal level continues. Check whether the
external input device is faulty or whether the wiring between the device and
the external input terminal is correct.
13.3 Troubleshooting by Symptom
13 TROUBLESHOOTING
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