Using Timers (T) And Holding Timers (#) - Omron ZEN Operation Manual

Using Timers (T) and Holding Timers (#)

3-6

Using Timers (T) and Holding Timers (#)

The ZEN has 16 built-in timers and 8 built-in holding timers.
Timers The present value being timed will be reset when the timer switches from RUN
mode to STOP mode or the power is turned OFF.
There are four uses of the timer available, depending on the additional function
selection.
Holding timers The present value being timed is held even when the timer switches from RUN
mode to STOP mode or the power is turned OFF. The time will continue when
the trigger input turns ON again. The ON status of the timer bit is also held
when the timer times out.
Only ON-delay holding timers are supported.
Timer Operation (T0 to Tf)
Timer type
X ON delay
timer
OFF delay
timer
O One-shot
pulse timer
F Flashing pulse
timer
Note
Turns ON
Trigger input
after a set
Reset input
interval after
Setting
the trigger
Present
value
input has
turned ON.
Timer bit
Stays ON
Trigger input
while the trig-
Reset input
ger input is
Setting
ON and turns
Present
value
OFF after a
set interval
Timer bit
after the trig-
ger input has
turned OFF.
Remains ON
Trigger input
for a set inter-
Reset input
val when the
Setting
Present
trigger input
value
turns ON.
Timer bit
Turns ON and
Trigger input
OFF repeat-
Reset input
edly at set
Setting
Present
intervals while
value
the trigger
input is ON.
Timer bit
Only T0 to T7 (8 points) are supported by pre-V1 CPU Units.
Operation
0
0
0
0
Section 3-6
Main
applications
Time lag oper-
ations
Useful for tim-
ing for lighting
and ventilat-
ing fans
Useful for
quantitative
operation
where opera-
tion is always
required for
the same
period.
Useful as an
alarm circuit
for flashing
emergency
lighting or
buzzers.
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