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MELSEC-Q
7 ONLINE MODULE CHANGE
7.2 Online Module Change Operations
The following gives the operations performed for an online module change.
PLC CPU operation : Executed : Not executed
GX Configurator
X/Y refresh
FROM/TO
instruction
1
Device test
Initial setting
parameter
Monitor/
test
(User operation)
3
(Intelligent function module
operation)
X/Y refresh resumes and
the module starts.
RUN LED turns on.
Default operation
(Xn3 remains OFF)
Module is operating as usual.
Module stops operating.
RUN LED turns off.
Module operates according
to test operation
Turn OFF all Y signals that
were turned ON by a
sequence program.
Operate GX Developer to start
an online module change.
(2) Dismounting of module
Click the [Execution] button
of GX Developer to make the
module dismountable.
Dismount the corresponding
module.
After mounting the module,
click the [Execution] button
of GX Developer.
Operation check before control start
Click the [Cancel] button of
GX Developer to leave the
online mode.
Conduct an operation test on
the new module using
"Device test" of GX Developer
or "Monitor/test" of
GX Configurator.
Operate GX Developer to
resume the online module
change mode, and click the
[Execution] button to resume
control.
(5) Resumption of control
Operation check completed
Mount a new module.
(3) Mounting of new module
(1) Operation stop
(4) Operation check
2
When there are initial setting
parameters, operation is
performed according to the initial
setting parameters at this point.
Xn3 (Module ready flag)
turns ON.
Start is made when Xn3 turns
from OFF to ON.
Operation is performed
according to the initial setting
sequence.
2
Terminates the online
module change operation
1: Access to the intelligent function module device (U \G ) is included.
2: In the absence of the operation marked 2, the operation of the intelligent function module is the operation performed prior to that.
3: The item numbers (1) to (5) correspond to the operation step numbers of "Section 7.3 Online module change procedure".
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