What is the beginning of the relay often often closed end? How to connect
Often open is always open, power closed after!
Normally closed is always closed, after power to open! You have this connection because the working end of the relay is a passive interface, so your control loop must be active (that is, there is a power supply, if you are the general PLC only take the passive port that is not required). Control the action coil of the relay to achieve control of other systems. Wiring must be clear that the relay is their own action coil, which is the relay output control interface
Relays in the case of no power, the contacts are often open, normally closed, marked in the shell, according to your request to properly connect.
Often refers to the normal circumstances. Normally, that is, no electricity just out of the box that time.
Is closed is normally closed, is open is often open.
There is an electromagnetic device in the relay.
A normally closed, and normally closed immediately closed.
How do we know how you want to connect? Please follow the drawings.
Often open is always open, power closed after!
Normally closed is always closed, after power to open!
