The YOKOGAWA EB511-10 is a Bus Interface Module.

A programmable logic controller (PLC) is an industrial control computer used for automated electrical and mechanical systems. It consists of programmable microprocessors, input/output (I/O) modules, communication interfaces, and power supply components.

• Digital I/O module: used to process digital signals from devices such as sensors and switches, and send digital signals to devices such as actuators and indicators.
• Analog I/O module: used to process analog signals from sensors and transmitters, and send analog signals to devices such as actuators and indicators.