3
SEQUENCE PROGRAM CONFIGURATION AND
EXECUTION CONDITIONS
3.4 Operation Processing
3.4.1 Initial processing
3 - 63
1
Overview
2
Performance
Specification
3
Sequence Program
Configuration and
Execution Conditions
4
I/O Nunber Assignment
5
Memories and Files
Handled by CPU Module
6
Functions
7
Communication using
built-in Ethernet ports of
CPU module
8
Communication with
Intelligent Function
Module
3.4 Operation Processing
This section explains the operation processing of the CPU module.
3.4.1 Initial processing
Initial processing is a pre-processing to execute sequence operations.
Initial processing is executed once when the actions described in Table3.4 are taken to the
CPU module.
When the initial processing is completed, the CPU module is placed in the operation status
set by the RUN/STOP switch (RUN/STOP/RESET switch in the case of the Basic model
QCPU and Universal model QCPU).( Section 3.5)
: Executed : Not executed
* 1: Indicates that the parameter or program was changed in a STOP status and the CPU was placed
in a RUN status without being reset.
(Move the RUN/STOP switch (RUN/STOP/RESET switch in the case of the Basic model QCPU
and Universal model QCPU) from STOP to RUN (RUN LED flickers) and then STOP to RUN.)
Note that the pulsing instruction (PLS, P) may not act normally with the above operation since
the previous information may not be inherited depending on the program changes.
* 2: Boot from a memory card is inexecutable since the memory card cannot be used in the Basic
model QCPU.
* 3: Multiple CPU system parameter consistency check is not performed for the Redundant CPU,
since it cannot configure the multiple CPU system.
* 4: When the start mode is the hot-start mode in the Redundant CPU, devices outside the latch range
are not initialized. (Except some devices such as a step relay and an index register.)
* 5: The serial communication function is not available for the High Performance model QCPU,
Process CPU, Redundant CPU, and Universal model QCPU.
* 6: Boot from a standard ROM is inexecutable for the Universal model QCPU. ( Section 5.2.3)
Table3.4 Initial processing list
Initial processing item
CPU module status
When the power is
turned ON
When the reset
operation is
performed
When the status is
switched from
STOP to RUN
*1
The I/O module initialization
Boot from the standard ROM/memory card
*2 *6
PLC parameter check
Multiple CPU system parameter consistency check
*3
Device initialization of the range not latched
*4
(bit device: OFF, word device: 0)
Automatic I/O number assignment of mounted modules
CC-Link IE controller network information setting
MELSECNET/H network information setting
Switch setting of intelligent function module
CC-Link information setting
Ethernet information setting
Setting of device initialization values
Serial communication function setting
*5
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