● Using relays with the SET and RST instructions does not result in duplicate output. Even if
Total Check is implemented, it is not treated as a syntax error.
● The RST instruction can be used to turn off the relay.
● The output destination of the SET instruction holds the state even while the MC instruction is
in operation.
● The output destination of the SET instruction will be reset when the operation mode is
switched from RUN to PROG. or the power is turned off. However, this is not the case when
an internal relay set to the hold type is specified as the output destination.
● A pulse relay (P) cannot be specified as an output destination of the SET and RST
instructions.
● The error alarm buffer can be all cleared by RST SD60.
● The first entry of the error alarm buffer can be cleared by RST SD61.
■
Processing mechanism of SET and RST instructions
● The output content is overwritten with each step during processing of the operation.
● Since I/O refresh is done when the ED instruction is executed, data actually output depends
on the final operation result.
● In order to output an operation result while processing is in progress, use the direct output
(OT) instruction.
When X100 to X102 are all ON in the above program
(1) Processing is done with Y110 to be ON.
3.15 SET, RST (Set, Reset)
3-32 WUME-FP7CPUPGR-12
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