Block1 Block4
Block3Block2
However, if there is a Return instruction in the middle of a program and the execution condition is met,
the POU is ended and a return is made to the source of the call. No processes after Return instruction
are executed.
Execution Control
Safety programs that are written in the FBD language are generally executed from top to bottom, but
you can use the Jump instruction to change the execution order.
For example, when the value of variable a
changes to TRUE in the following example, execution will
move to the network labeled "Exception".
You cannot jump to a network that is above the current network.
a Exception
Exception:
FB1
FB2
Execution jumps
here
6 Programming
6 - 23
NX-series Safety Control Unit User's Manual (Z930)
6-4 Programming Languages
6
6-4-2 FBD Language
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