What are the function of retentive on off timer?
What are the function of retentive on off timer?
Program Description: Retentive ON delay timer is to delaying the ON time, if input goes off in between, it will resumes the accumulator value and input turns ON, it will start running for the resumed value.
How do I reset my retentive timer?
When its rung condition goes from false to true again, the retentive timer’s Accumulate value counts up from where it stopped the last time. To reset a retentive timer’s Accumulate value to zero, a reset instruction with the same timer address must be used.
Which one is non-retentive off delay timer?
Typically, off-delay timers are non-retentive only (Note 2 ).
What is retentive type timer?
Some timers are referred to as retentive. Retentive refers to the device’s ability to remember its exact status such that when the circuit is again activated, the timer continues from the previous point. Non-retentive timers reset to zero and start from zero each time the timer function block is energized.
Where are retentive timers used?
The RTO, also know as Retentive Timer, an instruction is used to keep track of time just like the TON Instruction.
What is difference between on delay and off delay timer?
As for Timer ON Delay, Timer starts by turning ON the timer trigger bit, and the timer output bit turns ON when the setup time has passed. As for Timer OFF Delay, the timer output bit turns OFF when the setup time has passed after the timer input bit had turned OFF.
What is an off delay timer?
Off-delay timers can be used in air-conditioning systems to hold the blower motor in operation for a specific time period after the thermostat has turned the cooling compressor off. They may also be used to operate electrical devices and motors for a specified time, such as coin-operated dryers in commercial laundries.
What is non-retentive timer?
Non-retentive timer 1. A retentive timer is one that accumulates time whenever the device is receiving power and retains the accumulated value even in case of loss of power. A non-retentive timer (ON delay timer) just accumulates time only when power continuity is maintained.
What is an off timer?
Basically On timer means it’s on in starting ( for a set time ) then it’s close… and off timer means it’s off in starting for a set time then it’s on after that time. After the input is turned on there is a delay before the output is turned on.
What is off delay timer in PLC?
Program Description. Off- delay timer instructions is used to program a time delay to begin after rung input goes false. As an example, when an external cooling fan on a motor is provided, the fan has to run all the time the motor is running and also for certain time (say 10 min) after the motor is turned off.
What is on timer and off timer?
Timer ON is used to switch on the AC after a set time period. Timer OFF is used to switch off the AC after a set timer period.