Allen-Bradley Micro800 General Instructions Manual page 37

EN input/EN output
If a first Boolean input or output is not present, an EN and/or an ENO parameter
will be added to the block.
•
If the first block input is not Boolean, an EN input parameter is added to
the block. The instruction block is executed only when the EN input is
TRUE.
•
If the first block output is not Boolean, an ENO output parameter is added
to the block. The ENO output always has the same state as the first input of
the instruction block.
Rockwell Automation Publication 2080-RM001D-EN-E - February 2015
Ladder Diagram (LD) elements
Chapter 3
37