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2 PROCESSING OF OPERATIONS ACCORDING TO CPU MODULE OPERATION STATUS
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2 PROCESSING OF OPERATIONS ACCORDING
TO CPU MODULE OPERATION STATUS
The CPU module has three operation statuses as follows:
• RUN status
• STOP status
• Paused
Processing of operations on the CPU module in each status is explained below.
Processing of operations in RUN status
In the RUN mode, operations in the sequence program are executed repeatedly in order step 0END (FEND)
instructionstep 0.
■Output when CPU module enters RUN mode
Operation results are output after the sequence program is executed for the duration of one scan.
The device memory other than the output (Y) holds the state immediately before the RUN state. However, if device initial
value is set up, this initial value is set.
■Processing time until start of operation
The processing time from the CPU module switching from STOPRUN up to start of execution of operations in the sequence
program fluctuates according to the system configuration and parameter settings. (Normally, this time is within one second.)
Processing of operations in STOP status
In the STOP status, execution of operations in the sequence program is stopped by the RUN/STOP/RESET switch or a
remote stop. The CPU module also enters the STOP status when a stop error occurs.
■Output when CPU module enters STOP status
When the CPU module enters the STOP status, all output points (Y) turn OFF. For device memory other than outputs (Y),
non-latch devices are cleared and latch devices are held.
However, when SM8033 is on and CPU module switches RUNSTOP, it is possible to hold an output state and the current
value of a device.
Processing of operations in paused status
In a paused status, execution of operations in the sequence program is stopped after one scan execution but with outputs and
device memory states held, by a remote pause.