Question

State the method used to reset the accumulated time of each of the following: a. TON timer b. TOF timer c. RTO timer

Answer 1

In PLC programming, the TON, TOF, and RTO timers are reset by either addressing their reset inputs or using a separate reset instruction in the PLC program. Methods may vary by PLC brand and model.

Step-by-step explanation:

To reset the accumulated time for different types of timers in PLC (Programmable Logic Controller) programming:

• TON Timer (Timer On-Delay): The TON timer can be reset by addressing its reset (RST) input or by using a separate reset instruction in the PLC program that targets the TON timer's accumulated value.
• TOF Timer (Timer Off-Delay): Similar to the TON timer, the reset of a TOF timer is achieved by activating its reset input or by a reset instruction in the PLC program.
• RTO Timer (Retentive Timer On-Delay): The RTO timer maintains its accumulated value even when the control power is lost. To reset it, the RTO timer requires a specific reset command in the program, which clears its accumulated time.

Each timer type within a PLC has a unique way of being reset, and the exact method can vary depending on the specific PLC brand and model. For accurate implementation, refer to the PLC's programming manual.