The number 16 represents the number of products in a certain batch. The Counter C5:0 has a “Preset” of 16.A CTU instruction is tied to Counter C5:0.A “Product PROC Sensor ON” is indicated by an internal bit B3:0/13.A Micrologix 1100 Allen Bradley PLC is used to control a process.
Here’s a real-world scenario of a CTU instruction: The CTU instruction must be paired with a way to reset the counter through a RES Instruction. It’s a widely used instruction which is extremely versatile and easy to work with. This critical element of ladder logic programming allows a programmer to keep track of how many products have passed a certain sensor, how many revolutions have been made by a certain motor, how many times a certain alarm was set and so on. Unline the Timer Instruction, the CTU will not keep incrementing until the rung is set to LOW and comes back to being HIGH. The CTU instruction will increment the “Accum” value each time the logic which leads into it is set to TRUE.
The CTU, also known as the Count Up, instruction is used in pair with a Counter construct to count the number of LOW to HIGH transitions of the preceding logic.
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