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7.3 Precautions for Using Annunciator (F) in Redundant System
7
PROGRAMMING CAUTIONS
(b) When turning on the annunciators by the "SET" instruction
By creating the following program and tracking the "SET" instruction execution
condition, the annunciators can also be turned on in the new control system CPU
module at system switching.
* 1: SM1518 is a contact that turns on in the new control at occurrence of system switching and
remains ON for one scan.
Diagram 7.15 Program That Turns on the Annunciators by the SET Instruction after System Switching
F10 is turned on at the second scan
(SM1518: ON OFF) after system switching.
*1
F11 is turned on at the second scan
(SM1518: ON OFF) after system switching.
*1
SM1518
Tracking is executed
M0
0
4
F10SET
M1
SM1518
F10SET
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