Timer and Counter Instructions
Timers and counters control operations based on time or the number of events.
Available Instructions
Ladder Diagram
Function Block and Structured Text
If you want to | Use this instruction |
time how long a timer is enabled | TON |
time how long a timer is disabled | TOF |
accumulate time | RTO |
time how long a timer is enabled with built-in reset in function block | TONR |
time how long a timer is disabled with built-in reset in function block | TOFR |
accumulate time with built-in reset in function block | RTOR |
count up | CTU |
count down | CTD |
count up and count down in function block | CTUD |
reset a timer or counter | RES |
The time base is 1 msec for all timers. For example, a 2 second timer’s .PRE value should be 2000.
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