30
Memory Areas Section 1-4
Timers and Counters
Timer Types
Normal output [ Turns ON or OFF according to the ON/OFF status of the execution
condition.
Set/Reset S (set) Holds ON status after the execution condition turns ON once.
R (reset) Holds OFF status after the execution condition turns ON once.
Alternate A Alternates between ON and OFF whenever the execution condition
turns ON (input latch operation).
Name Type Bit ad-
dresses
No. of
timers/
counters
Function Use in
ladder
programs
Page
Timer T 0 to f 16 Can be switched between ON
delay, OFF delay, one-shot, flashing
pulse, and twin timer
operation.(See note.)
N.O./N.C.
condition
74
Holding
timer
# 0 to 7 8 Hold the present value during
counting even if the trigger input or
power supply is turned OFF.
Continues the timing when the
trigger input or power supply is
turned ON again.
74
Counter C 0 to f 16 Four-digit reversible counters that
can be incremented and
decremented.
78
8-Digit
counter
F 0 1 An eight-digit reversible counter
that can be incremented and
decremented. CPU Units with DC
power supplies support a high-
speed counter up to 150 Hz.
78
Weekly
timer
@ 0 to f 16 Can be switched between normal
operation, operation between days,
and pulse output operation. Cannot
be used for LED-type CPU Units.
81
Calendar
timer
0 to f 16 Can turn ON or OFF during a
specified date period. Cannot be
used for LED-type CPU Units.
86
X ON delay Times down while the trigger input is ON and turns ON the timer bit when the set
time is reached.
■ OFF
delay
Turns ON the timer bit while the trigger input is ON, starts timing down when the
trigger input turns OFF, and turns OFF the timer bit when the set time is reached.
O One-shot Turns ON the timer bit for the set period when the trigger input changes from OFF
to ON only.
F Flashing
pulse
Timer bit repeatedly turns ON/OFF at set intervals while the trigger input is ON.
W Twin Timer bit repeatedly turns ON/OFF at set intervals while the trigger input is ON. The
ON time and OFF time can be set separately.
Z211-E1-03.book Page 30 Friday, November 21, 2008 10:38 AM
To Next Page
Loading...
