Keen to grow your control device's local networking capabilities? This PLC expansion module from Siemens adds an extra serial port to your controller, letting you pass process information to more appliances at once. Its standardised 9-pin D-sub port is widely compatible with common equipment, making sure data flows smoothly through your system. Handy LED indicators on the front plate show you the unit's connection status to help you spot problems as they pop up. As it plugs directly into your control device, the module cuts down on preparation time so you can focus on the task at hand. You'll find it commonly used for communication across food production and plastics processing facilities.

• Compact dimensions of 30 (W) x 100 (H) x 75mm (D), so it's easy to install in tight spaces
• Power loss of just 1.2W, for energy-efficient communication
• Works with cables up to 1,000m in length to carry signals over long distances

This unit works with 24V DC input voltages, so it's easily compatible with standard power supplies.