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This is the web edition of the original ⮫ AC500-S safety user manual, version 1.3.2. This web edition is provided for quick reference only. The original safety user manual must be used to meet functional safety application requirements. |
The following ST language control elements are suitable for creating safety applications:
|
Keyword |
Suitable (yes / to a limited extent / no) (comment) |
|---|---|
|
IF |
Yes |
|
CASE |
Yes |
|
FOR |
Yes |
|
WHILE |
To a limited extent. (Proof of avoidance of an infinite loop is required.) |
|
REPEAT |
To a limited extent. (Proof of avoidance of an infinite loop is required.) |
|
EXIT |
To a limited extent. (Exits a loop immediately. A loop should only be exited through its end condition leave.) |
|
RETURN |
To a limited extent. (Exits a subroutine immediately. A subroutine should only be exited once all instructions have been processed.) |