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Detailed explanation of relay control circuit and PLC ladder diagram
2024年07月23日 10:53
1.Detailed explanation of relay control circuit and PLC ladder diagram
1. Jog circuit
Function introduction: As the name suggests, it moves when clicked and remains stationary when loosened, that is, pressing the button to start and releasing the button to stop
2. Automatic hold circuit with stop function
(1) Function Introduction
A basic form of maintaining circuit state, mainly used to maintain the state of external signals
(2) Working principle
Power on=Press the normally open button 0→ Relay coil J0 receives power→ J0 normally open main contact closed→ The motor is powered on and the J0 normally open auxiliary contact is self-locking; The motor continues to operate, as shown in Figure 2-8.
Shutdown=Press the normally closed button 1→ Relay coil J0 loses power and J0 auxiliary contact is disconnected at the same time; The motor shuts down due to power loss, as shown in Figure 2-7.
(3) Circuit applications
Below we compare the relay coil before and after being powered on:
