6 PLC Timer Instructions

Timer instructions are often used in machine controls to provide this between two events in a machine's sequence

• Multiple outputs

• Multiple inputs

• Time Delay

• Count-based logic

Which type of timer has a reset input?

• Non-retentive

• TON

• TOF

• Retentive

What is the amount of time that a TON timer has been timing called?

• Elapsed Time (ET)

• Preset Time (PT)

• Reset (RST)

• Count Value (CV)

Which type of non-retentive timer only turns on its Q output after the elapsed time is equal to the preset time?

• TFO

• TON

• TOF

• TNO

Which non-retentive timer instruction turns on its output when its input turns true?

• TFO

• TON

• TOF

• TNO

Which input is used by a retentive RTO instruction that is not used by the non-retentive TON and TOF instructions?

• Enable

• Preset

• Reset

• Reset time