Allen-Bradley MicroLogix 1200 Reference Manual page 102

6-4 Using High-Speed Outputs
Stage
Rung State
Sub-Elements:
Normal Operation/NO
Accelerate Status/AS
Run Status/RS
Decelerate Status/DS
Enable/EN
Done/DN
Idle/ID
Jog Pulse/JP
Jog Continuous/JC
Publication 1762-RM001C-EN-P
Momentary Logic Enable Example
In this example, the rung state is a momentary or transitional type of
input. This means that the false-to-true rung transition enables the PTO
instruction and then returns to a false state prior to the PTO instruction
completing its operation.
If a transitional input to the PTO instruction is used, the Done (DN) bit
turns on when the instruction completes, but only remains on until the
next time the PTO instruction is scanned in the user program. The
structure of the control program determines when the DN bit goes off. So,
to detect when the PTO instruction completes its output, you can monitor
the Done (DN), Idle (ID), or Normal Operation (NO) status bits.
0 1 2 3 4
Relative Timing
Start of PTO
5 6 7 8 9 10 11
Start of PTO
12