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timer base value of timer instruction

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Electrical Engineering

timer base value of timer instruction

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TIMERS All PLCs have timer instructions Timers are outputinstructions that are internal to the programmable logiccontroller Timers provide timed control of the devices that theyactivate or deactivateBasic functionsof timer Timers are used to delay an actionTimers are used to run an operation for a predetermined periodof timeTimers are also used to record the total accumulated time ofcontinuous or intermediate eventsTimersinstructions Timers consists of following parts timer address preset valuetimer base and accumulated value as shown in figure belowfigaIn the above figure term instruction name is timer on delay TON timer base is 10 seconds timer address is T40accumulated value of zero0 and a preset value of 200Each timer instruction has three very useful status bits Thesebits are timer enable E N timer timing TT and timerdoneDNThere are 3 types oftimers On delay timerOffdelay timerretentive timerOn delaytimer Use this instruction to program a time delay after instructionsbecome trueOn delay timers are used when an action is to begin aspecified time after the input becomes true For example a certainstep in the manufacturing is to begin 45 seconds after a signal isreceived from a limit switch The 45 seconds delay is the ondelaytimers preset valueOff delaytimer Off delay timer instructions is used to program a time delayto begin after rung input goes falseAs an example when an externalcooling fan on a motor is provided the fan has to run all the timethe motor is running and also for certain time say 10min afterthe motor is turned off This is a ten minute off delay timer Thetenminute timing period begins as soon as the motor is turnedoffRetentive timer Retentive timer is a timer whichretains the accumulated value in case of power loss change ofprocessor mode or rung state going from true to false rung statetransitionRetentive timer can be used to track the running time of amotor for its maintenance purpose Each time the    See Answer
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