Support for up to 188 inputs and outputs—these PLCs are ideal for basic tasks where more advanced PLCs would be overkill, such as operating lighting and HVAC systems. They’re also known as smart relays. Connect these PLCs to your Ethernet network to control devices anywhere in your facility. They use an open communication protocol, so you can mix and match devices from different manufacturers. Mount them to 35 mm DIN rail in your electrical cabinet or use mounting brackets (sold separately) to secure them to a flat surface.

You’ll need a license key (sold separately) for the manufacturer’s software. Write your program in common PLC languages, such as Ladder Logic and Structured Text, then transfer your program to the PLC with an Ethernet cord. Use the software to monitor, test, and troubleshoot issues in real time. Add a memory card to back up, store, and transfer programs to multiple machines.

These PLCs have digital inputs and outputs. PLCs with relay outputs are ideal for devices that switch a few times per minute, such as compressors. PLCs with transistor outputs are ideal for devices that switch multiple times per second, such as indicator lights and stepper motor drives. They’re PNP outputs, also called sourcing outputs, so they work only with NPN devices. If you need to connect different devices, use an output converter or signal converter (both not included).

PLCs with analog inputs receive signals from devices that monitor temperature, pressure, and other measurements that vary.

Screw terminals are the most common wire connection—insert your wires and tighten the screws to secure them. Spring-clamp terminals hold wires with a clamp instead of screws, so connections stay secure, even with vibration.

Add expansion modules to PLCs when your system grows or needs new functionality. All modules have an LED status indicator to show the device is powered and running.