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Function Block Interface

Function block interface

Rules for the definition of Motion Control function blocks according to PLCopen

The input/output variables of the function blocks mandatory according to the PLCopen Standard are marked with the letter 'B' in the defined tables in the definition of the function blocks.

Input/output variables marked with the letter 'E' are optional, i.e. they can be implemented but are not mandatory.

Vendor specific input / output variables, i.e. added by the vendor, are marked with the letter 'V'.

According to the IEC 61131-3 specification, the input variables may be unconnected or not parameterized by the user. In this case, the function block will use the value from the previous invocation of the function block instance, or in case of the first invocation, the initial value will be used.