The timer is used to perform the timing function. Each timer contains coils, contacts, and counting time value register. When the coil sounds (with sufficient power), the timer starts timing. If the timer’s registered value reaches the preset value, the contacts activate, and other contacts (NO contacts) are closed, while b contacts (NC contacts) disconnect. If the coil power shuts off (insufficient power), the contacts will restore to their initial states and the value will automatically be cleared. Some timers have the feature of accumulation and shut-down. After a restart, it will even keep the value before the shut–down.
2. Timer list
Timers have different timing steps. For instance, 1ms, 10ms, 100ms, and etc. See the following:
This is a simple demo for timer in LX3V PLC. In this demo, Y0 will be ON for 3min and OFF for 1min, when M0 set ON.