PLC Timers Explained | On-Delay, Off-Delay and Retentive Timer On

This video explains common PLC timer instructions including timer on delay, timer off delay, and retentive timer on. It covers preset value, time base, accumulated value, enable/timing/done bits, reset behavior, and when retentive timing is used to preserve elapsed time through false rung conditions or faults. Useful for PLC and ladder-logic students.