Omron NJ-series User Manual page 202

Execution Conditions for Function Blocks
Function blocks do not have an EN input like functions. They are executed each period.
Processes That Require Constant Data Monitoring
Case
Normal opera-
tion
Inside a mas-
ter control
region
Refer to 6-5-2 Ladder Diagram Language for details on power flow output and parameter output.
You can specify the edge for an input variable to make the variable TRUE only when the input
parameter changes to TRUE.
A
Instance X
You can specify falling edges too.
A
Instance X
NJ-series CPU Unit Software User's Manual (W501)
Algorithm in FB
Executed. Normal end
Error end
Executed when the state of
the power flow input is
FALSE.
ENO Operations other than ENO
TRUE Output parameters: Values are updated
according to the internal algorithm.
In-out parameters: Values are updated
according to the internal algorithm.
FALSE Output parameters: Retained
In-out parameters: Values are updated
according to the internal algorithm.
User-specified One of the above, depending on the value
of ENO.
Variable A
Specifies detecting a change to TRUE.
Variable A
Specifies detecting a change to FALSE.
6 Programming
Instance
FB
X
6
Instance
FB
X
6-15