Bradley Smoker PLC-5 user manual Counter Instructions, Rto, Res, Ctu

D-4Instruction Set Quick Reference

Instruction Description

RTO

RETENTIVE TIMER ON

Timer	T4:10
Time Base	1.0
Preset	10
Accum	0

Retentive Timer On

RTO

Status Bits:

EN - Enable

TT- Timer Timing DN - Done

If the input conditions go true, timer T4:10 starts incrementing i 1-second intervals as long as the rung remains true. When the rung goes false, the timer stops. If the rung goes true again, th timer continues. When the accumulated value is greater than o equal to the preset (10), the timer stops and sets the timer don bit.

	Rung	EN	TT	DN	ACC	RTO
	Condition	15	14	13	Value	Status
False		0	0	0	0	Disabled
	True	1	1	0	increase	Timing
	False	0	0	0	maintains	Disabled
	True	1	0	1	>= preset	Done

T4:1		Timer Reset	If the input conditions go true, timer T4:1 is reset. This
( RES	)	RES	instruction resets timers and counters, as well as control
			blocks. This is necessary to reset the RTO accumulated value.

Counter Instructions

Instruction Description

CTU

COUNT UP

Counter C5:1

Preset10

Accum0

Count Up

CTU

Status Bits:

CU-Count Up CD-Count Down DN-Count Up done OV-Overflow UN-Underflow

If the input conditions go true, counter C5:1 starts counting, incrementing by 1 every time the rung goes from false-to-true. When the accumulated value is greater than or equal to the preset value (10), the counter sets the counter

Rung	CU	DN	OV	ACC	CTU
Condition	15	13	12	Value	Status
False	0	0	0	0	Disabled
Toggle True	1	0	0	incr by 1	Counting
True	1	1	0	>= preset	Done
True	1	1	1	>32767	Overflow

See page F-8 for a description of prescan operation for this instruction.

Publication 1785-UM012D-EN-P - July 2005