Precautions After Module Change - Mitsubishi Q Series User Manual

7 ONLINE MODULE CHANGE

7.4.2 Precautions after module change

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(1) Data recovery
Leaving from online module change mode once when changed module is
normally recognized allows you to recover the data before resuming control.
As direct device access (MOV Un\G*), FROM/TO instruction and auto refresh
setting by sequence program are invalid at this moment, perform data recovery
with test operation of GX Developer or GX Configurator-TC manually. In addition,
confirmation of control and writing to FeRAM are possible at this moment as
necessary.
Also, if initial setting parameter is set on GX Configurator-TC, the initial setting
contents are stored in the buffer memory when changed module is normally
recognized.
(2) Check before resuming control
Before resuming control, check the following items. If any fault is found, refer to
Troubleshooting in Chapter 8 and take corrective action.
(a) The RUN LED is on.
(b) The ERR. LED is off.
(c) The watchdog timer error flag (Xn0) is off.
(d) The error flag (Xn2) is off.
REMARK
Note that module ready flag (Xn3) does not turns on just after mounted a module by
online module change unlike in the case of usually starting up. Module ready flag
(Xn3) turns on after resuming control. In consequence, sequence program, which
sets the initial states by startup of module ready flag (Xn3), operates at resuming
control.
MELSEC-Q
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