Allen-Bradley offers two types of counters: up counters (CTU) and down counters (CTD).

Name: Allen-Bradley offers two types of counters: up counters (CTU) and down counters (CTD).
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Allen-Bradley programmable logic controllers (PLCs) indeed offer two types of counters: up counters (CTU), which increment the count value when the input condition transitions from false to true, and down counters (CTD), which decrement the count value under the same conditions.

Allen-Bradley Offers Two Types of Counters: Up Counters (CTU) and Down