What is the relay used for?
June 14,2022
Modbus RS485 relay,12Ch relay.
What is the relay used for?
A relay is an electrical device that connects or disconnects a circuit according to changes in electrical quantities (such as voltage, current, etc.) or non-electrical quantities (such as heat, time, pressure, rotational speed, etc.) to achieve automatic control and protection of electric drive devices.
The relay is generally composed of three basic parts: the sensing mechanism, the intermediate mechanism and the actuator.
The role of Modbus RS485 relay
1. Expand the scope of control. For example, when the control signal of the multi-contact Modbus RS485 relay reaches a certain value, it can switch, break, and connect multiple circuits at the same time according to the different forms of the contact group.
2. Zoom in. For example, sensitive relays, intermediate relays, etc., can control high-power circuits with a very small amount of control.
3. Integrated signal. For example, when multiple control signals are input to the multi-winding relay in a prescribed form, a predetermined control effect is achieved through comparison and synthesis.
4, automatic, remote control, monitoring. For example, the Modbus RS485 relay on the automatic device, together with other electrical appliances, can form a program control line to realize automatic operation.
What is the difference between an electromagnetic relay and a solid state relay (SSR)?
Solid-state 12Ch relays are widely used in digital program control devices, micro-motor control, temperature adjustment devices, data processing systems and computer terminal interface circuits, especially for special occasions such as frequent movements, explosion-proof moisture resistance, and corrosion resistance.
The solid-state 12Ch relay has high lifespan, high reliability, high sensitivity, low control power, good electromagnetic compatibility, fast switching speed, and low electromagnetic interference;
Disadvantages of solid-state 12Ch relay: The voltage drop of the tube after conduction is large, and the on-resistance of the general power FET is also larger than the contact resistance of the mechanical contact.