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CHAPTER3  CPU MODULE OPERATION

This chapter 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 

Table3.1 

is performed to 

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. (

 : Performed, 

 : Not performed

*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.

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  

RUN

RESET

STOP

RUN/STOP/RESET switch