Mitsubishi Q00JCPU User Manual page 93

3
SEQUENCE PROGRAM CONFIGURATION AND
EXECUTION CONDITIONS
Redundant
Note3.18
(3) Precautions for initial execution type program creation
Note18
Since the Redundant CPU cannot use low speed execution type programs, it is not necessary to
Redundant
take into account the low speed execution type program execution time when setting the initial
execution watch time.
Note3.18
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 watch time
The initial execution watch time is measured by the timer that watches the initial
scan time.
The setting range is 10 to 2000ms (setting unit: 10ms).
No default value is preset to the initial execution watch time (There is no default
value.).
1) When initial execution watch time is exceeded
A "WDT ERROR" occurs when the initial scan time exceeds the preset initial
execution watch time.
The CPU module stops the operation.
POINT
1. When an initial execution type program and low speed execution type
Note3.18
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.Note18
As the initial execution watch 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 watch time is set, the error of the measurement
value is 10ms.
When the initial execution watch 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
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