194
13 TROUBLESHOOTING
13.3 Troubleshooting by Symptom
When the S MODE LED is flashing or off
When the S MODE LED is flashing (1s cycle)
*1 For details on the 2nd module and later safety special register, refer to the following.
MELSEC iQ-R CPU Module User's Manual (Application)
Changing the module parameter of the I/O module with diagnostic functions and writing it to the remote head
module causes a change in the safety parameter, and thus the I/O module with diagnostic functions
automatically shifts to the safety module disabled state. To set the I/O module with diagnostic functions to the
safety module enabled state again, it is required to perform [Import Setting] to the changed project of the
remote head module by using "Safety Communication Setting" of the CPU module project, and then to enable
the safety module.
When the S MODE LED is flashing (400ms cycle)
When the S MODE LED is off
Check item
Action
Check whether the status is "Safety station interlock status".
Monitor the 'safety station interlock status on a per-safety connection basis
(1st module)' (SA\SD1232 to SA\SD1239)
, and check the interlock status of
the I/O module with diagnostic functions.
When the interlock state is "Interlocked", operate the 'safety station interlock
release request on a per-safety connection basis (1st module)' (SA\SD1240 to
SA\SD1247)
that corresponds to the I/O module with diagnostic functions to
release the interlock state of the I/O module with diagnostic functions.
For details on the safety special register, refer to the following.
MELSEC iQ-R CPU Module User's Manual (Application)
Check whether the I/O module with diagnostic functions is in safety module
disabled state.
Enable the safety module for the I/O module with diagnostic functions. If
enabling the safety module fails, follow the steps below again starting from
"Safety communication setting".
Page 132 Procedure on the SIL2 Process CPU side
Check whether the remote head module is in STOP state.
Check the RUN/STOP/RESET switch for the remote head module and if it is
set to STOP, change it to RUN.
Check whether the wiring between the master station and the remote head
module is correct.
Check the wiring between the master station and the remote head module.
Check whether a momentary power failure has occurred in the remote head
module.
(Check whether a power shutoff (error code: 1000H) has occurred in the
remote head module. (
MELSEC iQ-R CC-Link IE Field Network Remote
Head Module User's Manual (Application)))
When a momentary power failure has occurred in the remote head module, if
a value of the transmission interval monitoring time for the master station or
the I/O module with diagnostic functions is smaller than the value described in
the precaution about a momentary power failure of the remote head module,
safety communications may stop.
Take the following actions if necessary.
• Take measures against a momentary power failure. (
MELSEC iQ-R
Module Configuration Manual)
• Check "Transmission interval monitoring time" of the I/O module with
diagnostic functions. (
• Check "Sending Interval Monitoring Time" of the master station. (
MELSEC iQ-R CC-Link IE Field Network User's Manual (Application))
For the precaution about a momentary power failure of the remote head
module, refer to the following.
MELSEC iQ-R CC-Link IE Field Network Remote Head Module User's
Manual (Application)
Check item
Action
Check whether the module position check has been executed.
With "Safety Module Operation" in the engineering tool, select the relevant
module and click [S MODE LED Stop Flashing] button.
Check item
Action
Check whether the operation mode is set to SIL2 mode.
Check with the GX Works3 system parameter to see if the operation mode of
the I/O module with diagnostic functions is SIL2 mode. If not, switch to the I/O
module with diagnostic functions in SIL2 mode in the module configuration
window.
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