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Operator: OR

If the IEC OR operator is used for programming in the Safety FBD Editor, the following must additionally be observed:

  • Basic Level: All OR inputs must be SAFEBOOL (in accordance with PLCopen).

  • The output is SAFEBOOL only if all inputs are SAFEBOOL.

  • In the Extended Level Level, the OR inputs can be mixed BOOL and SAFEBOOL. In this case the output is BOOL.

    (conforms to PLCopen, since in this case the SAFEBOOL inputs in the OR operator are switched to BOOL by the SAFE polymorphism).

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