This CTU command is an UP counter. When an input is received the counter is incremented by one. When the counter reaches a specified value, the specified register will turn ON There is also a reset input so the counter can be reset as needed.

This CTD command is a DOWN counter. When an input is received the counter is decremented by one. When the counter reaches 0, the specified register will turn ON. There is a also a reset input so the counter can be reset as needed.

CTU command can count up to 65535. If a higher value is needed, use this ladder logic.

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