Omron C200HE User Manual

The following figure illustrates the relationship between the execution conditions
for a totalizing timer with a set value of 2 s, its PV, and the Completion Flag.

00000

LD

00000

00001

TTIM(87)

TIM

000

#

0020

LR

2100

00000

TTIM(87) 

TIM 000

#0020

LR 2100

Timer input
(I: IR 00000)

Reset bit
(RB: LR 2100)

Completion Flag
(TIM 000)

Present value: 0020

0000

N: TC number

# (000 through 511)

SV: Set value (word, BCD)

IR, AR, DM, HR, LR, #

CP

R

CNT N

SV

 

Each TC number can be used as the definer in only one TIMER or COUNTER
instruction.

CNT is used to count down from SV when the execution condition on the count
pulse, CP, goes from OFF to ON, i.e., the present value (PV) will be decrem-
ented by one whenever CNT is executed with an ON execution condition for CP
and the execution condition was OFF for the last execution. If the execution
condition has not changed or has changed from ON to OFF, the PV of CNT will
not be changed. The Completion Flag for a counter is turned ON when the PV
reaches zero and will remain ON until the counter is reset.

CNT is reset with a reset input, R. When R goes from OFF to ON, the PV is reset
to SV. The PV will not be decremented while R is ON. Counting down from SV will
begin again when R goes OFF. The PV for CNT will not be reset in interlocked
program sections or by power interruptions.