10
DEVICE EXPLANATION
10.2 Internal User Devices
10.2.10 Timer (T)
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(b) Measurement units
The default time measurement units setting for low speed timers is 100 ms.
The time measurement units setting can be designated in 1 ms units within a 1 ms
to 1000 ms range.
This setting is designated at the "PLC system" tab screen in the "(PLC)
Parameter" dialog box.
(5) High-speed timers
(a) Definition
High-speed timers provide higher measurement accuracy than low-speed timers.
The measurement units for each CPU are shown in Table 9.
The timer is valid only while its coil is ON, and has a symbol "H".
The time measurement begins when the timer's coil switches ON, and the contact
switches ON when the time elapses. When the timer's coil switches OFF, the
current value becomes "0", and the contact switches OFF.
(b) Measurement units
Measurement units are set in the PLC system tab of the PLC parameter dialog
box.
Figure 10.22 Ladder example and timing chart of high-speed timer
Table10.7 Measurement units in each CPU
CPU module
Basic model QCPU,
High Performance model QCPU,
Process CPU and Redundant CPU
Universal model QCPU
Measurement units
0.1 to 100ms(0.1ms units)
0.01 to 100ms(0.01ms units)
X0
H
K50
T200
High-speed timer display
OFF
OFF
OFF
ON
ON
ON
X0
[Ladder example]
When X0 switches ON, the T200 coil switches ON, and
the contact switches ON 0.5 second later. (The high-
speed timer measures time in 10 ms units.)
[Time chart]
0.5s
T200 coil
T200 contact
