Rockwell Automation AutoMax Enhanced Ladder Language Reference Manual - Manual (Page 43)

3Ć3
3.1 Retentive Timer On (RTO)
Use this instruction to set an event at a preset interval. This instruction retains the
Elapsed value after EN goes false and resumes keeping time when EN is true again.
The timer can stop and start without the Elapsed value being reset.
When EN is true, the instruction begins incrementing the value in Elapsed. When the
value in Elapsed equals the value in TPreset, output Q becomes true. Reset this
instruction by setting input TR.
The value in Elapsed is in increments of 0.01 seconds.