16. PLC Counters: CTU, CTD, and One-Shots


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In industrial automation, PLC counters are used when a machine needs to count events.

A counter can count:

Parts
Boxes
Bottles
Cycles
Machine strokes
Rejects
Pallets
Sensor pulses
Production totals

A counter does not count time.A counter counts how many times …

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6. Sinking and Sourcing Inputs Explained Simply


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One of the most confusing topics for many automation technicians is sinking and sourcing.

You may hear people say:

PNP sensorNPN sensorSourcing inputSinking inputCurrent sourcingCurrent sinking

At first, it sounds complicated. But the …

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