Precautions After Module Change - Mitsubishi Electric MELSEC-Q Series User Manual

7 ONLINE MODULE CHANGE

7.4.2 Precautions after module change

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(1) Restoring data
Once a module is changed successfully, the online module change mode is
terminated and restoration of data is enabled before restart of the control.
Since the direct device access (MOV Un\G*) using a sequence program,
FROM/TO instructions, and auto refresh setting are disabled at this point, restore
data manually with test operation of GX Developer or GX Configurator-TC.
Control operation can be checked and data can be written to FeRAM at this
moment if needed.
If initial setting parameters has been set using GX Configurator-TC, the initial
setting data are stored in the buffer memory when a module is changed
successfully.
(2) Checking the status before restarting control
Before restarting control, check the status of the following items. If any error is
detected, refer to Chapter 8 and take a corrective action.
(a) The RUN LED is on.
(b) The ERR. LED is off.
(c) Watchdog timer error flag (Xn0) is off.
(d) Error flag (Xn2) is off.
REMARKS
Note that, unlike normal startup, Module ready flag (Xn3) does not turn on
immediately after a new module is mounted during an online module change. This
flag (Xn3) turns on after control is restarted. If there is any sequence program that
configures the initial settings on the rising edge of this flag (Xn3), the program is
executed upon restart of the control.
MELSEC-Q
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