Relay Modules

Relays are switches that open and close circuits. They control one electrical circuit by opening or closing contacts in another circuit. When a relay contact is normally open (NO), there is an open contact when the relay is not energized. When a relay contact is normally closed (NC), there is a closed contact when the relay is not energized. Applying electrical current to the contacts will change their state. Many relays use an electromagnet to mechanically operate a switch, but other operating principles such as solid-state relays are also used. Relays are used where it is necessary to control a circuit by a low-power signal or where several circuits must be controlled by one signal. Depending on the structural features and operating principle, relays are of different types such as monitoring, regulating, auxiliary and protective. Classification of the types of relays depend on the function for which they are used.

PLC logic relays combine logic, interface and field connections. They have a modular design with a variety of relay modules enabling channel-specific configurations, and sensors and actuators that can be connected directly to the relay. In addition to the basic module, extension modules can be added for more complex tasks. Up to 48 IO signals can be acquired with a basic module and two extension modules. Parameter adjustments and monitoring can be accomplished using an app for IOS and Android.