Industrial Automation, PLC, VFD, and Troubleshooting
In the previous post, we covered standard PLC counters such as:
CTU = Count Up
CTD = Count Down
CTUD = Count Up / Count Down
Those counters work well for many basic counting …
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In industrial automation, not every feedback signal is a simple ON/OFF input.
Sometimes the PLC or controller needs to know:
How fast is the shaft moving?How far did the conveyor travel?What position …
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