1

Open or create a new POU in Instruction List language.

NOTE: The procedure to create a POU is not detailed here. For more information, refer to Adding and Calling POUs.

2

Create the variables that the function requires.

3

If the function has 1 or more inputs, start loading the first input using LD instruction.

4

Insert a new line below and:

otype the name of the function in the operator column (left field), or

ouse the Input Assistant to select the function (select Insert Box in the context menu).

5

If the function has more than 1 input and when Input Assistant is used, the necessary number of lines is automatically created with ??? in the fields on the right. Replace the ??? with the appropriate value or variable that corresponds to the order of inputs.

6

Insert a new line to store the result of the function into the appropriate variable: type ST instruction in the operator column (left field) and the variable name in the field on the right.

without input parameter:

IsFirstMastCycle

with input parameters:

SetRTCDrift

IL example of a function without input parameter:

IsFirstMastCycle

IL example of a function with input parameters:

SetRTCDrift

1

Open or create a new POU in Instruction List language.

NOTE: The procedure to create a POU is not detailed here. For more information, refer to Adding and Calling POUs.

2

Create the variables that the function block requires, including the instance name.

3

Function Blocks are called using a CAL instruction:

oUse the Input Assistant to select the FB (right-click and select Insert Box in the context menu).

oAutomatically, the CAL instruction and the necessary I/O are created.

Each parameter (I/O) is an instruction:

oValues to inputs are set by ":=".

oValues to outputs are set by "=>".

4

In the CAL right-side field, replace ??? with the instance name.

5

Replace other ??? with an appropriate variable or immediate value.

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