Rockwell Automation 1772-LV Mini-PLC - 2/15 Programmable Controller (Series B) Programming and Operations - Manual (Page 47)

Fundamental Instruction Set
Chapter 5
5Ć10
CAUTION: Allowances should be made for conditions which
could be created by the use of the jump instruction. Jumped
program rungs are not scanned by the processor so that input
conditions are not examined and outputs that are controlled by
these rungs remain in their last state. Timers and counters cease
to function. Critical rungs should be reprogrammed outside the
jumped section in the program zone.
Timer OnĆDelay Instruction
Symbol: -(TON)-
Purpose: Can be used to turn a device on or off once an interval is timed out.
Syntax: Programmed as an output instruction.
Function: When the rung condition becomes:
True
Timer cycle begins
Timer increments its AC value.
Bit 15 is set when AC=PR and the timer stops timing.
Bit 17 is set.
False
Accumulated value resets to 000.
Bits 15 and 17 are reset.
Timer Off Delay Instruction
Symbol: (TOF)-
Purpose: Can be used to turn a device on or off once an interval in timed out.
Syntax: Programmed as an output instruction.
Function: When the rung conditions becomes:
True
Bit 15 is set.
Bit 17 is set.
Accumulated value resets to 000.
False
Timer cycle begins.
Timer increments its AC value.
Bit 15 resets when the AC=PR and the timer stops timing.
Bit 17 is reset.