Mitsubishi Q00JCPU User Manual page 129

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3
SEQUENCE PROGRAM CONFIGURATION AND
EXECUTION CONDITIONS
Redundant
Universal
UD
Note3.20
Note3.20
(3) Precautions for initial execution type program creation
Note19
Since the Redundant CPU and Universal model QCPU cannot use low speed execution type
Redundant
Universal
programs, it is not necessary to take into account the low speed execution type program
UD
execution time when setting the initial execution monitoring time.
Note3.20
Note3.20
3) When interrupt program/fixed scan execution type program is executed
When an interrupt program/fixed scan execution type program is executed
before completion of the initial execution type program execution, the interrupt
program/fixed scan execution type program execution time is added to the
initial execution type program execution time.
(c) Initial execution monitoring time
The initial execution monitoring time is a timer for monitoring the initial scan time.
The setting range is 10 to 2000ms (setting unit: 10ms).
The initial execution monitoring time is not set by default. (There is no default
value.) Set the time on the PLC RAS setting tab of PLC parameter. (
this section)
1) Exceeding the initial execution monitoring time
A "WDT ERROR" occurs when the initial scan time exceeds the preset initial
execution monitoring time.
The CPU module stops the operation.
POINT
1. When an initial execution type program and low speed execution type
Note3.20
program
are to be executed, the low speed execution type
program(
Section 3.3.3)is executed after completion of the initial
execution type
program.Note19
As the initial execution monitoring time, set a value greater than the total
execution times of the initial execution type program and low speed execution
type program.
2. When the initial execution monitoring time is set, the error of the measure-
ment value is 10ms.
When the initial execution monitoring time (t) is set to 10ms, a "WDT ERROR"
occurs within a scan time range of 10ms<t<20ms.
In initial execution type programs, instructions that require several scans until
execution completion (instructions where completion devices exist) cannot be used.
Example: SEND, RECV and similar instructions
3.3 Settings for Creation and Execution of Multiple Sequence Programs
3.3.1 Initial execution type program
1
2
(4)(b) in
3
4
5
6
7
8
3
- 31

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