Whenplcprogramming often need several hours, or even longer delay, the best way is series timer, or PLCinternal counter.Using the timer series Can be a long delay, in essence, it is to allow multiple timers turn ON, delay time is Accumulatingmultipletimer settings.Serial time delay
Set time of the timer T1 is a counter C100 input pulse signal, so that the delay time is several times of T1 setpoint.
Timers and counters associated with long time delay
The internal special relay R901E (1 min clock) as the counter C100 input signal, so that the time delay is a few minutes. If a counter does not meet the requirements, the counter can be used in series, that is, the contact of the front counter is used as the input pulse signal of the back of a counter to achieve a longer time delay.
PLC ONE 