PLC counters are normally non-retentive

PLC counters are normally non-retentive.

A. True
B. False

Show Answer

Answer: B

Share your understanding of this question with the correct explanation.


The statement is false. PLC (Programmable Logic Controller) counters can be either non-retentive or retentive, depending on their type and configuration.

Non-retentive counters:

Non-retentive counters, also known as regular or normal counters, do not retain their count value after a power loss or when the PLC is turned off. When the PLC program starts or is reset, the non-retentive counters are initialized to their initial count value and start counting from there. If the power is interrupted, the counter will reset to its initial value when the power is restored.

Retentive counters:

Retentive counters, on the other hand, retain their count value even after a power loss or when the PLC is turned off. The count value is stored in a non-volatile memory, and when power is restored, the counter continues counting from where it left off before the power interruption.

The choice between non-retentive and retentive counters depends on the specific application requirements. Non-retentive counters are typically used for tasks where it is not necessary to retain the count value during power cycles, while retentive counters are used for applications where it is important to preserve the count value even after power outages or PLC restarts.