Rockwell Automation 1772-LS_LSP,D17726.8.6 PROG/OPER MANUAL-MINI PLC-2/05 User Manual
Page 72
Timers and Counters
Chapter 8
8Ć5
When the rung condition becomes:
True
RTR instruction resets the accumulated value of the RTO instruction.
Bits 15 and 17 are reset.
False
No action is taken.
Keystrokes: You enter a Retentive Timer On or a Retentive Timer Reset
instruction by performing the following steps.
1.
Press -(RTO)- or -(RTR)-.
2.
Enter <address>.
Perform the following step for a Retentive Timer instruction only.
3.
Enter <time base>.
4.
Enter <preset value>.
Editing in a Completed Rung
You edit a Retentive Timer On or a Retentive Timer Reset instruction by
performing the following steps.
1.
Position the cursor over the Retentive Timer or Retentive Timer Reset you
are going to change.
2.
Press -(RTO)-, -(RTR)-, or any other appropriate instruction type key.
3.
Enter <address>.
Important: Do not perform steps 4 and 5 for a Retentive Timer
Reset instruction.
4.
Enter <time base> if appropriate.
5.
Enter <preset value>.
A counter counts the number of events that occur and stores this count in its
accumulated value word. Counters can be located anywhere in the data table.
The last valid counter address is 5477 (in a fully expanded data table). An
event is defined as a false-to-true transition. Counter instructions have no
time base.
Counter Instructions