This can also be used to engage an automatic lubrication system after a certain amount of run time. When you perform the PM, press a reset button to start the timer again. For example: After a system accumulates a total of 6 hours of run time, a light might come on indicating that PM is needed. This might be used to keep total track of machine run time for maintenance. The exception is that it keeps the accumulated value when the rung goes false.

This timer works almost exactly like the TON. If no valves on a system have moved in the last 15 minutes, it might be OK to shut off the hydraulic pump. Another good example is for energy savings. When the motor shuts off, the blower might still run for a few minutes to cool down the motor. When the motor starts, the blower will start. A good example of this is a blower on a motor to keep the motor cool. The TOF instructions delays an event from shutting off.

Also, if a system on your equipment goes into an alarm condition, you might delay informing the operator for a few seconds to prevent nuisance alarms. When the operator presses a start button, you might want to blow a warning horn for a few seconds before the conveyor actually starts. The TON instruction will delay an event from taking place such as a conveyor starting. Assembly Registers and Compatibility Modes.FactoryTalk View SE Trends and Data Log.Beginning a FactoryTalk View SE Project.Derivative Settings for ControlLogix PID Enhanced.Integral Settings for ControlLogix PID Enhanced.Proportional Settings for ControlLogix PID Enhanced (PIDE).Proportional, Integral, Derivative (PID).Consequently, when the main motor shuts off, the blower (on the DN bit) shuts off later.Īs an illustration, let’s take a look at how you would see this timer in logic. When the motor energizes, the blower energizes. For example, you might use this timer on a motor that has a blower to keep it cool. When the TOF goes false, the DN bit remains on until the accumulated value reaches the preset. When the timer goes true, both the EN (Enable) and DN (Done) bit come on. TOF - Timer Off DelayĪll things considered, the TOF is the most difficult timer to understand because of it’s operation. After 5 seconds, T4:0/DN becomes true, and O:000/0 will energize. When I:000/0 goes true, the EN bit goes true, and the timer begins to time. This will give you the preset in seconds.Īt this point, let’s take a look at 2 rungs of logic: Obviously, this would limit the number of nuisance alarms.Īs far as the preset goes, multiply the value in the preset by the time base (1 or. You might want to sound an alarm only if the condition goes true for 2 seconds. You might use this timer to delay a conveyor from starting while a horn blows. For the TON, however, the DN bit only goes true after the timer has timed out, and the rung is still true. Any time the accumulated value is incrementing, the TT (Timer Timing) bit is true. Keep in mind that for timers, any time the rung is true, the EN (Enable) Bit is true.

On the whole, the TON is the most widely used timer. For the most part, it’s a good idea to have a few spare timers available in case you need to use them while your system is running. With this in mind, you cannot expand the data file if the processor is in Run or Rem Run mode. As you can see, I’ve expanded the number of timers by clicking “Properties” at the bottom of this window. At anytime, you can monitor the memory usage under “Controller properties”.įor example, let’s open the T4 Data file. Keep in mind, though, that you do have a limitation on the processor memory. Go to properties, and you can create up to 1000 timers (0 to 999). It’s important to realize that you can expand this data file. By default there is one timer, which is T4:0. In this case, let’s open the T4 data file. Our data files appear in the Project Tree at the left of your environment.

Rslogix using tag as timer preset