The bit above is tied to an XIC instruction which enables the TON instruction.A “Tank Cooling Sequence” is initiated by an internal bit B3:0/4.A Micrologix 1100 Allen Bradley PLC is used to control a process.Here’s a real-world scenario of a TON instruction: Example: Once the motor is started, wait 5 second start the next step. If such an input is missing, it's possible to issue a timer delay that would assume that the motor is running after a certain time. In other words, once an output is set to start a motor, the user may receive feedback that confirms that the motor is running at speed. If there's a way to get the status of these elements, it's possible to avoid using timers. As a process is initiated via a "start" push button, each element is started based on a sequence. An example of a required timer would be during a startup sequence. A timer is needed in many PLC applications and is used to delay a certain condition.
Depending on the application, you may not need to use all of them.Īn Allen Bradley timer instruction is common to be seen in RSLogix 5, 500, 5000 as well as Studio 5000. The TON instruction is a composite instruction which means that it will contain a timer, integers as well as booleans. Furthermore, experienced developers can leverage the instruction to know when a certain process is being executed. Once this value is reached, the program will set specific internal bits notifying the programmer as well as other instructions within the PLC that the timer has finished counting. The conditions preceding the TON instruction will allow the timer to start counting up to a specified value. The TON, also known as Timer ON, an instruction is used to keep track of time of occurrence of certain events.
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