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Relay Modules

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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.

Relay modules contain components that make switching and connecting easier, and act as indictors to show if the module is powered and if the relay is active. On the input side of a standard single-channel relay module, is the screw terminal block. This is the part of the module that comes in contact with the mains, and screw terminals make it easier to connect thick mains cables. The three connections on the terminal block are connected to the normally open, normally closed and common terminals of the relay. An input jumper is used to supply power to the relay coil and the ‘relay status LED.’ The output connectors are wires that are suitable for hardware connection.

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.

Subcategories

Multi-Channel Solid-State Relay Modules
Relay Extension Modules
PLC Logic Standalone Logic Modules
Relay Transformer Power Modules

Products

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Phoenix Contact 2907446 PLC Logic Standalone Logic Modules Base unit
Phoenix Contact 2907446 PLC Logic Standalone Logic Modules Base unit
$169.73
PLC logic basic logic module, generation 2, with 16 I/Os, for plug-in connection to 8 digital or analog PLC-INTERFACE terminal blocks, can be extended to 48 I/Os, integrated realtime clock, micro USB socket, accommodates memory block and Bluetooth Adaptor, push-in connection
Phoenix Contact 2907445 PLC Logic Standalone Logic Modules Base unit
Phoenix Contact 2907445 PLC Logic Standalone Logic Modules Base unit
$146.11
PLC logic standalone logic module, generation 2, with 16 I/Os, for plug-in connection to 8 digital or analog PLC-INTERFACE terminal blocks, cannot be extended, integrated realtime clock, micro USB socket, accommodates memory block and Bluetooth Adaptor, screw connection
Phoenix Contact 2907443 PLC Logic Standalone Logic Modules Base unit
Phoenix Contact 2907443 PLC Logic Standalone Logic Modules Base unit
$146.11
PLC logic standalone logic module, generation 2, with 16 I/Os, for plug-in connection to 8 digital or analog PLC-INTERFACE terminal blocks, cannot be extended, integrated realtime clock, micro USB socket, accommodates memory block and Bluetooth Adaptor, push-in connection
Phoenix Contact 2907447 PLC Logic Standalone Logic Modules Base unit
Phoenix Contact 2907447 PLC Logic Standalone Logic Modules Base unit
$169.73
PLC logic basic logic module, generation 2, with 16 I/Os, for plug-in connection to 8 digital or analog PLC-INTERFACE terminal blocks, can be extended to 48 I/Os, integrated realtime clock, micro USB socket, accommodates memory block and Bluetooth Adaptor, screw connection
Phoenix Contact 5521322 Multi-channel solid-state relay Modules
Phoenix Contact 5521322 Multi-channel solid-state relay Modules
$194.81
VARIOFACE 4-channel module for solid state relays
Phoenix Contact 2906921 Extension module
Phoenix Contact 2906921 Extension module
$85.24
Analog output module for PLC logic logic Modules (Generation 2 only), single-channel, signal type (4 - 20 mA, 0 - 20 mA, 0 - 10 V, 2 - 10 V) can be configured via DIP switch, Push-in connection
Phoenix Contact 2906918 Extension module
Phoenix Contact 2906918 Extension module
$77.48
Pt 100/Pt1000 temperature transducer for PLC logic logic Modules (Generation 2 only), single-channel, signal type (Pt 100, Pt 1000) can be configured via DIP switch, screw connection
Phoenix Contact 2903095 Extension module
Phoenix Contact 2903095 Extension module
$91.43
PLC logic extension logic module with 16 I/Os for plug-in connection to 8 PLC-INTERFACE terminal blocks for extending the basic module (a maximum of two extension Modules can be connected to a basic module), screw connection
Phoenix Contact 2906917 Extension module
Phoenix Contact 2906917 Extension module
$72.83
Analog input module for PLC logic logic Modules (Generation 2 only), single-channel, signal type (4 - 20 mA, 0 - 20 mA, 0 - 10 V, 2 - 10 V) can be configured via DIP switch, Push-in connection
Phoenix Contact 2906920 Extension module
Phoenix Contact 2906920 Extension module
$85.24
Analog output module for PLC logic logic Modules (Generation 2 only), single-channel, signal type (4 - 20 mA, 0 - 20 mA, 0 - 10 V, 2 - 10 V) can be configured via DIP switch, screw connection
Phoenix Contact 2906919 Extension module
Phoenix Contact 2906919 Extension module
$77.48
Pt 100/Pt1000 temperature transducer for PLC logic logic Modules (Generation 2 only), single-channel, signal type (Pt 100, Pt 1000) can be configured via DIP switch, Push-in connection
Phoenix Contact 2905137 Extension module
Phoenix Contact 2905137 Extension module
$91.43
PLC logic extension logic module with 16 I/Os for plug-in connection to 8 PLC-INTERFACE terminal blocks for extending the basic module (a maximum of two extension Modules can be connected to a basic module), push-in connection

 

In most of today's modern electrical control scenarios, it is common to see some kind of controller or PLC that is monitoring the state of certain electrical components and providing control over several electrical circuits. This controller has the ability to process the information coming in and send output commands in response. This is all done using some kind of programming language, like ladder logic. However, before controllers were widely used, or in situations where the functions of the electrical circuits were quite simple, relay logic was used.  

So what is relay logic? Relay logic consists of relays wired up in a particular fashion to perform various switching operations to one or many different electrical circuits. The method in which the relays are wired will impact the overall function of the control that is provided. Relay logic circuits use a combination of relays and other components such as switches, motors, timers, actuators, contactors, lights and many other types of electrical hardware. Relay logic control uses basic ON/OFF functionality, which is quite simple, but can perform very complex control tasks depending on how many relays are used and the configuration of the wiring.  

This type of control uses different parts of the relays for different functions.  For example, the coil portion of the relay can be used as a discrete input point. When the coil receives voltage, it will perform a switching operation.  Depending on the relay, this might mean the relay switches just one circuit or it could switch many circuits. This switching can then control other relay coil inputs or it might turn on a light or motor. It all depends on the need of the control circuit.

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