The Honeywell 620-0021 is a 4k memory module used in Honeywell’s ISSC industrial control systems.

A Distributed Control System (DCS) is a computer-based system used to automate, monitor and control complex industrial processes. It is typically used in large plants such as refineries, power plants, chemical plants, and paper mills.

• Controllers:These are devices that receive input from sensors and send output signals to actuators. Controllers use pre-programmed logic to control the process.
• Sensors:These are devices that measure physical quantities such as temperature, pressure, flow, and level.
• Communication network:This network connects all of the components of the DCS together.

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