What does t 1 stand for in plc?

The delay device T 1 in plc stands for delay, which is a special timer. Its function is to delay the arrival of the input signal for a period of time, and then trigger the corresponding output signal. Delay device is an electronic component that can provide delay function. It can delay the input electrical signal before output. Used for control switch, serial communication, time measurement, signal identification, etc. It is widely used in automation equipment, industrial production, aerospace, communication, medical instruments and other fields.