79
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
4 Devices in Detail
4.5 Timer [T]
1
In
troduct
io
n
2
Ov
e
rv
ie
w
3
In
st
ru
ct
ion
Li
st
4
D
evi
ce
s
in
De
ta
il
5
Speci
fied t
h
e
D
evi
ce &
C
onst
a
nt
6
Bef
o
re
Pr
ogr
a
m
m
ing
7
Bas
ic
In
st
ru
cti
o
n
8
FNC0
0
-FNC0
9
P
ro
g
ra
m F
lo
w
9
FNC1
0
-FNC1
9
M
ov
e
&
C
om
par
e
10
FNC
20-
FNC
2
9
Ar
ith.
&
Logi
c
O
per
at
io
n
4.5
Timer [T]
Timers add and count clock pulses of 1 ms, 10 ms, 100 ms, etc. inside the PLC. When the counted value
reaches a specified set value, the output contact of the timer turns on.
A set value can be directly specified by a constant (K) in the program memory, or indirectly specified by the
contents of a data register (D).
4.5.1
Numbers of timers
The table below shows timer (T) numbers. (The numbers are assigned in decimal.)
Timer numbers not used for timers can be used as data registers for storing numeric values.
*1.
Retentive timers are backed up by battery.
4.5.2
Functions and operation examples
General type
When the drive input X000 of the timer coil T200 turns ON, the
current value counter for T200 adds and counts clock pulses of
10 ms. When the counted value becomes equivalent to the set
value K123, the output contact of the timer turns on.
In other words, the output contact turns on 1.23 seconds after the
coil is driven.
When the drive input X000 turns OFF or when the power is
turned off the timer is reset and the output contact returns.
Retentive type
When the drive input X001 of the timer coil T250 turns ON, the
current value counter for T250 adds and counts clock pulses of
100 ms. When the counted value becomes equivalent to the set
value K345, the output contact of the timer turns on.
Even if the drive input X001 turns OFF or the power is turned off
during counting, the timer continues counting when the operation
restarts. The retentive operating time is 34.5 seconds.
When the reset input X002 turns ON, the timer is reset and the
output contact is returned.
For 100 ms pulses
0.1 to 3276.7 sec
For 10 ms pulses
0.01 to 327.67 sec
Retentive type for 1
ms pulses
*1
0.001 to 32.767 sec
Retentive type for
100 ms pulses
*1
0.1 to 3276.7 sec
For 1 ms pulses
0.001 to 32.767 sec
FX
3U
/
FX
3UC
PLC
T 0 to T199
200 points
-------------
Routine program
type
T192 to T199
T200 to T245
46 points
T246 to T249
4 points
Interrupt execution
latched (battery
backed) type
*1
T250 to T255
6 points
Latched (battery
backed) type
*1
T256 to T511
256 points
X000
T200
T200
Y000
K123
1.23 sec
Set value
X000
Current
value
Y000
Set value
(constant)
A data register
can be
specified also.
X001
T250
T250
Y001
K345
Set value
(constant)
A data register
can be
specified also.
X002
RST
T250
Current
value
Y001
X001
X002
Set value
t2
t1
Retentive time
t1 + t2 = 34.5 sec