Rockwell Automation 1772-LV Mini-PLC - 2/15 Programmable Controller (Series B) Programming and Operations - Manual (Page 46)

Fundamental Instruction Set
Chapter 5
5Ć9
Two bits in the accumulated value word are status bits:
Bit 15 is the timed bit. It is set either on or off wen the timer has timed out.
The settings on or off depend on the type of timer instruction used.
Bit 17 is the enable bit. It is set when rung conditions are true and is reset
when rung conditions are false.
There are four types of timer instructions available with the controller:
Timer on-delay
Timer off-delay
Retentive timer on-delay
Retentive timer reset
We will look at these timers in detail. Chapter 9 illustrates programming
applications for timers and counters. Figure 5.3 shows the timer instructions
and Figure 5.4 shows the counter instructions.
Figure 5.3
Timer Instructions with Their Default Values
046
1.0
Input
TON
PR 000
AC 000
046
1.0
Input
TOF
PR 000
AC 000
046
1.0
Input
RTO
PR000
AC000
046
1.0
Input
RTR
PR 000
AC 000
Timer on delay
Timer off delay
Retentive Timer
Retentive Timer reset
Note: 1.0 is a timebase.