Rockwell Automation 1772-LP3 PLC - 2/30 Programmable Controller Programming and Operations Manual - Manual (Page 104)

Timer and Counter Instructions
Chapter 5
5Ć6
Figure 5.4
Timer OffĆDelay, Timing Diagram for a Preset Value of 9 Seconds
ON
OFF ЙЙЙ
ЙЙЙ
ЙЙЙ
ЙЙЙ ON
OFF
0 1 2 3 4 5 6 7 8 9 10 11 12
ЙЙ
ЙЙ
ЙЙЙЙЙЙЙЙЙЙЙ
ЙЙЙЙЙЙЙЙЙЙЙ
ЙЙЙЙЙЙЙЙЙЙЙ
ЙЙЙЙЙЙЙЙЙЙЙ
ЙЙЙЙЙЙЙЙЙЙЙ
1
2
0
1
2
ЙЙ
ЙЙ
0
4
5
6
3
7
8
9
O N
O F F
O N
O F F
Time in Seconds
Status Bits are
to 1 and Accumul
Value is Reset Wh
Input Switch is C
Input Switch 113/05
Enable Bit 047/17
Preset Value
Accumulated Value
Timed Bit 047/15
Output Lamp 011/04
Rung 1 - TOF Instruction
Preset for 9 Sec. Delay
Rung 2 - Timer Turns Off
Bit 011/04 When Timed Out
|ą|
05
( TOF )
1.0
113 047
|ą|
15
(ą)
04
047 011
PR 009
AC 009
Input Switch
Timed Bit
Timer OnĆDelay
Output Lamp
AC = PR
ЙЙЙЙЙЙЙЙЙЙЙЙЙЙЙ
ЙЙЙЙЙЙЙЙЙЙЙЙЙЙЙ
ЙЙЙ
ЙЙЙ
ЙЙ
ЙЙ
ЙЙЙЙЙЙЙЙЙЙЙЙЙЙЙ
ЙЙЙЙЙЙЙЙЙЙЙЙЙЙЙ
ЙЙЙ
ЙЙЙ
ЙЙЙ
ЙЙЙ
ЙЙЙ
ЙЙЙ
ЙЙ
ЙЙ
The Retentive Timer instruction (RTO), much like the TON instruction, is
typically used to turn a device on or off once a programmed preset value is
reached (Figure 5.5).
5.1.3
Retentive Timer Instruction