Interface relays and optocouplers are useful to link sensors and actuators in the process, which are connected to the PLC via conventional wires.
The interface modules providing both voltage-current level adaptation and isolation.

Build in RC-circuits to increase the contact-life
Screw or spring terminals available
Compact design with a width from 6 mm or 12 mm
LED for relay status
Holes for holding 2 mm test plugs to simplify any measurements

To safely power up your system, add this solid state optocoupler from ABB. It uses light to efficiently transfer electrical systems from the input's point A to the output's point B. This gets things up and running in a jiffy while also isolating your equipment, meaning it's ideal for circuits that can't interact. Since it doesn't have any moving parts, this product's unlikely to break down, so you can count on a long lifespan. It's a smart option for use with sensitive setups where you need smooth voltage for reliable operation.

• Clips onto a standard DIN rail for quick and easy installation
• Green LED means it's easy to see its status
• Screw terminals make wiring simple and vibration-proof
• Broad operating temperature range between -20°C and +70°C for versatile use
• IP20 rating means it's touch-proof for safe handling

• Automated systems
• Manufacturing facilities
• Medical devices

Optocouplers contain an LED and a phototransistor. When the LED turns on, its counterpart detects that light and switches on your device.