A relay (https://www.easybom.com/c/relays) is an electronic control device, usually used in automatic control circuits. It is actually an "automatic switch" that uses a smaller current to control a larger current. Therefore, it plays the role of automatic adjustment, safety protection, and conversion circuit in the circuit. There are many types of relays, such as electromagnetic relays, reed relays, starting relays, time-limited relays, DC relays, and AC relays. However, electromagnetic relays are the most widely used in electronic circuits.
Generally, electromagnetic relays are generally composed of iron cores, coils, armatures, contact reeds, and so on. As long as a certain voltage is applied to both ends of the coil, a certain current will flow through the coil, which will produce electromagnetic effects. Under the action of electromagnetic force, the armature will overcome the pulling force of the return spring and attract to the core, thereby driving the armature. The moving contact and the static contact (normally open contact) are pulled together. When the coil is de-energized, the electromagnetic attraction will disappear, and the armature will return to its original position under the reaction force of the spring, making the moving contact and the original static contact (normally closed contact) attract. This pulls in and releases, so as to achieve the purpose of conducting and cutting off in the circuit. For the "normally open and normally closed" contacts of the relay, it can be distinguished as follows: the static contact that is in the off state when the relay coil is not energized is called "normally open contact"; the static contact that is in the on state is called It is a "normally closed contact".
In fact, electromagnetic relays can be divided into two types: DC and AC. The distinction is as follows: All AC electromagnetic relays have a copper short-circuit ring embedded in their iron core. There is no DC relay.
The built-in RS485 interface makes it have good scalability. Standard Modbus RTU I/O devices can be cascaded through the RS485 bus to realize the combination of various digital, analog, and thermal resistance IO modules, saving costs. At the same time, this device has the function of cluster machine register mapping. The data of the cluster machine is automatically collected into the mapping storage area of the machine. The host computer can respond quickly without waiting when inquiring, which meets the demanding and timely functional requirements of the industrial site.
The MxxxT industrial remote Ethernet I/O data acquisition module adopts industrial-grade circuit design, in which the digital input adopts optocoupler isolation, provides 12 pulse counting inputs, supports dry and wet contact input types, and the analog input adopts operational amplifier isolation, which supports 12-bit high-precision data acquisition, compatible with 0~5V, 0~10V, 0~20mA, 4~20mA input types, DO output is a triode sink output, providing a high-speed pulse output, RTD input supports two types: PT100 and PT1000 Type, analog AO output supports 0~10VDC output. It adopts industrial universal DC power supply and is equipped with anti-reverse connection protection design. At the same time, it provides a DC working power output for external equipment, reducing the difficulty and cost of on-site wiring.
Summarized by Easybom (https://www.easybom.com).