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CHAPTER3 CPU MODULE OPERATION
This section describes operation of the CPU module.
3.1 Initial Processing
The CPU module performs preprocessing required for sequence program operations.
The preprocessing is executed only once when any of the operations described in
the CPU module.
When initial processing is completed, the CPU module will be placed in the operation status set by the
RUN/STOP/RESET switch. (
Initial processing item
The I/O module initialization
Boot from a memory card
PLC parameter check
Multiple CPU system parameter consistency check
Initialization of devices outside the latch range
(bit device: off, word device: 0)
Automatic I/O number assignment of mounted modules
CC-Link IE controller network and MELSECNET/H
information setting
Intelligent function module switch setting
CC-Link information setting
Ethernet information setting
Initial device value setting
Serial communication function setting
*1: The operation indicates that the status is changed back to RUN without resetting the module after any parameter or program was changed
in the STOP status.
(The RUN/STOP/RESET switch is set from STOP to RUN (the RUN LED will flash), then back to STOP and to RUN again.)
Note that the PLS
P instruction (instruction for pulse conversion) may not be executed properly with the above operation. This is
because the previous information may not be inherited depending on the program changes.
If any parameter or program is changed in the STOP status, reset the CPU module using the RUN/STOP/RESET switch.
3 - 1
Section 3.5)
Table3.1 Initial processing list
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RUN/STOP/RESET switch
RESET
RUN
STOP
Table3.1
CPU module status
Reset
Changed from STOP to RUN
: Performed,
is performed to
*1
: Not performed
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