Retentive
Retentive means the component which will not forget it's value when the system restart. For example, we have a contact placed in the output of a push button and this counter is counting our input. When our system mistakenly restart, this will not forget it's value if this is a retentive contact. In short, retentive do not forget it's value.Non-Retentive
Non-retentive means the component which will forget it's value when the system will restart. For instance, we are using a contact in the output and it is counting something in the output. Now suddenly the system restart. This contact will start from zero position again because it cannot remember the value. This will forget previous value.Retentive Timers & Counters in PLC Programming
As we have discussed about the retentive and non-retentive, let's learn what does retentive timers and non-retentive timers mean in PLC programming. Retentive timer means if timer is continuously counting the time and suddenly the system will be switched OFF. After this restarting of system, this timer will start counting time from where it left because this is a retentive timer. It will not forget its previous time. Same for counters, counter will start counting from where it left, this means will not start again from zero.
Non-Retentive Timers & Counters in PLC Programming
As we know non-retentive means contact will not remember previous value and will start from zero. If we talk about non-retentive timers, after restarting the system, non-retentive timers will start again from zero because non-retentive timers will forget the previous value. Same for non-retentive counters. Non-retentive counters will start again from zero after restarting of system
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