Troubleshooting By Symptom - Mitsubishi Electric MELSEC iQ-R Series Manual

4.2

Troubleshooting by Symptom

This section describes the troubleshooting by symptom.
For the replacement by means of control of special relays and special registers
The troubleshooting when a module is replaced controlling special relays and special registers is shown in the following table
for each step in online module change.
No. Procedure Symptom
1 Module After 'Module selection request
selection flag' (SM1600) is turned on,
'Online module changing status'
(SD1617) does not become
Module selection completion (2).
2 Module After 'Module selection request
selection flag' (SM1600) is turned on,
'Online module changing status'
(SD1617) becomes Module
selection completion (2), but the
value in 'Online module changing
module I/O No.' (SD1602) does
not match the start I/O number
assigned to the module to be
replaced.
3 Module change After 'Module remove request flag'
activation (SM1602) is turned on, 'Online
module changing status'
(SD1617) does not become
Module removal ready (4).
4 Module After the module is removed,
removal 'Online module changing status'
(SD1617) does not become
Module removal completion (5).
5 Module After a new module is mounted,
mounting 'Online module changing status'
(SD1617) does not become
Module mounting completion (6).
Check item
Is 'Online module change error
flag' (SM1618) on?

Is 'Online module change error
flag' (SM1618) on?
Is the removed module the one
specified in the step of module
selection?
Is 'Online module change error
flag' (SM1618) on?
Action
When 'Online module change error flag' (SM1618) is on, it
indicates that an incorrect module has been specified due
to any of the following causes:
 A module that does not support the online module
change function has been specified.
 An I/O number with which no module is mounted has
been specified using 'Module selection (base No.)'
(SD1600) and 'Module selection (slot No.)' (SD1601).
 A module under control of another CPU module has
been specified.
Take the following corrective actions against each cause:
 To replace a module that does not support the online
module change function, power off the programmable
controller before the replacement.
 Correct the specified base unit number and slot
number, set 'Online module change error code'
(SD1618) to 0, and turn off 'Online module change
error flag' (SM1618) and 'Module selection request
flag' (SM1600). After that, try again from the step of
module selection.
 Perform online module change from the CPU module
or remote head module that controls the module.
When 'Online module change error flag' (SM1618) is off,
the CPU module or remote head module may be in
failure. Replace the CPU module or remote head module.
If an incorrect module is selected as the replacement
target module, turn on 'Module selection cancel request
flag' (SM1615), and then try again from the step of
module selection to select a correct module. ( Page
33 Module selection)
When 'Online module change error flag' (SM1618) is on,
take the corrective actions corresponding to the error
code stored in 'Online module change error code'
(SD1618). ( MELSEC iQ-R CPU Module User's
Manual (Application))
When 'Online module change error flag' (SM1618) is off,
the CPU module or remote head module may be in
failure. Replace the CPU module or remote head module.
When the removed module is not the one specified,
power off and on the programmable controller to recover
the system.
When 'Online module change error flag' (SM1618) is on,
take the corrective actions corresponding to the error
code stored in 'Online module change error code'
(SD1618). ( MELSEC iQ-R CPU Module User's
Manual (Application))
When 'Online module change error flag' (SM1618) is off,
the CPU module or remote head module may be in
failure. Replace the CPU module or remote head module.
4 TROUBLESHOOTING
4.2 Troubleshooting by Symptom
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