Details On Functions - Omron NX-SL3300 User Manual

6 Programming
Accessing Variables in a Function Block from Outside the Function
Block
You can access the input and output variables of a function block from outside the function block. Vari-
ables are written as follows:
InstanceName.VariableName
Example: To Access Output Variable B of Function Block Instance FB1_Instance
FB1_Instance.B
FB1_Instance.B
You can access the input and output variables for a function block only within the program that con-
tains the function block.
However, you cannot access these variables from within other function block instances even if they
are in the same program. You cannot access them from other programs.
6-1-6

Details on Functions

You cannot create user-defined functions for Safety Control Units. Only system-defined functions (in-
structions) are allowed.
Structure of Functions
With the FBD language, functions are represented as rectangular boxes as shown below.
A function consists of the following parts.
This function is expressed in the FBD language:
Para1
Para2
Input parameters
l Instruction Name
This is the instruction name.
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FB1_Instance
FB1
Instruction name
AND
Output1
Output parameters
B
NX-series Safety Control Unit User's Manual (Z930)