32.8.3 CTUD and CTUDP (Up/Down Counter)

Symbols and Features

Ladder Instruction Name

Ladder Symbol

Feature

Number of Steps

CTUD
(Up/Down Counter -
Level Sensitive)

Counter

2

Ladder Instruction Name

Ladder Symbol

Feature

Number of Steps

CTUDP
(Up/Down Counter -
positive transition)

Counter

2

32.8.3.1 Explanation of the CTUD and CTUDP Instructions