Omron SYSMAC CP Series, User Manual

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11 High-speed Counters
11-26
CP2E CPU Unit Software User’s Manual(W614)
11-5 Application Example
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Functions Used: High-speed Counting for a Built-in Input
A high-speed counter input can be used by connecting a rotary encoder to a built-in input. A CP2E
CPU Unit is equipped with more than one high-speed counter input, making it possible to control
devices for multiple axes with a single PLC.
High-speed counters can be used for high-speed processing, using either target value comparison
or range comparison to create interrupts. Interrupt tasks are executed when the counter value
reaches a specific target value or range
.
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Operation Overview
A sheet feeder is controlled to feed constant lengths in a given direction, e.g., for vacuum packing of
food products.
While the pulse count is between 3 ,500 and 3 ,550, normal stop position output (CIO 100.02) will be
ON. If the pulse count exceeds 3 550, the error stop position output (CIO 100.0 3 ) will turn ON.
Using a Rotary Encoder to Measure Positions
Motor speed
Motor start inp u t:
CIO 0.02
Motor r u n o u tp u t:
CIO 100.00
Motor lo w speed
o u tp u t: CIO 100.01
N ormal stop position
o u tp u t: CIO 100.02
Error stop position
o
u tp u t: CIO 100.03
Nu m b er of p u lses
co u nted b y high-
speed co u nter
(A270)
(P u lses)
The High-speed Co u nter Reset Bit
(A531.00) is t u rned O N in the ladder
program as soon a operation starts
and the reset process is performed.
3550
3500
3000