3 retentive timer instruction – Rockwell Automation 1772-LP3 PLC - 2/30 Programmable Controller Programming and Operations Manual User 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
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ON
OFF
0
1
2
3
4
5
6
7
8
9
10 11 12
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1
2
0
1
2
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0
4
5
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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
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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