Industrial control systems describe control systems where the devices, networks, and controls are used to automate and operate industrial processes.
A distributed control system (DCS) is a computerised control system for a process or plant usually with many control loops, in which autonomous controllers are distributed throughout the system, but there is no central operator supervisory control. This is in contrast to systems that use centralized controllers; either discrete controllers located at a central control room or within a central computer. The DCS concept increases reliability and reduces installation costs by localising control functions near the process plant, with remote monitoring and supervision.
This industrial control system is deployed and controlled in a distributed manner. So, various control systems and processes are controlled individually rather than by a centrally located single unit.