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5.2.10 Timer (T, ST)
Time counting starts when a coil is turned on, and it times out and the contact turns on when the current value reaches
the set value.
(1) Timer types
Timers are mainly classified into the following two types.
• Timer of which value is set to 0 and contact is turned off when a coil is turned off
• Retentive timer that holds both the current value and contact status even if the coil is turned off
Also, each timer has low-speed and high-speed timers.
(2) Specification of the timer
• The same device is used for the low- and high-speed timers, and the type is determined according to the
instruction used.
For the OUT T0 instruction, the low-speed timer is specified, and for the OUTH T0 instruction, the high-
speed timer is specified.
• The same device is used for the low- and high-speed retentive timers, and the type is determined according
to the instruction used.
For the OUT ST0 instruction, the low-speed retentive timer is specified, and for the OUTH ST0
instruction, the high-speed retentive timer is specified.
Timer Timer
Retentive
timer
Low-speed timer
High-speed timer
Low-speed retentive timer
High-speed retentive timer
Ex.
Ex.
Ex.
Ex.
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