4.3. Timer & Counter Relay

4.3. Timer & Counter Relay

 

(1)   Both timer and counter relay only support down–counting.

 

n Timer base can be set with 10msec unit by a user.

n Because the value of Timer is internally processed as 32bit value, so it can be count up to 2,147,483,647 [msec] (approximately 597hours).

 

(2)   The values of Timer / Counter have meanings as below.

 

Value of Timer & Counter	Description
0	Contact Point On (=counting completed)
-1	Contact Point Off
Others	Contact Point Off ; timing & counting (processing)

 

(3)   If Rung, which is connected to Timer / Counter relay, is deactivated.

 

n The value of TON: TL(Timer) becomes -1.

n The value of CTD: CL(Counter) is maintained.

 

(4)   While Rung, which is connected to Timer / Counter relay, is activated.

 

n TON

If a value of TL is less than 0, initial value of TL is saved as “Timer base x preset x 10”. If the value is greater than 0, it will be decreased by 5 for every 5msec.

 

n CTD

If a value of CL is less than 0, initial value of CL will be preset value.

If the value of CL is greater than 0, it will be decreased by 1 for each time when deactivation turns to activation.