A DCS is a computerized control system used to control production in various industries. It usually refers to a control system of a manufacturing system or process, in which the controller elements are not central in location but are distributed throughout the system with each component sub-system controlled by one or more controllers.

Systems used:
PCS7 – SIMATIC PCS 7 system components combine to form a uniform automation environment. The operator system is the window and gateway to the process; from here it is possible to observe and control all process steps. The engineering system gives access to data entered anywhere in the system — and duplicate entries are avoided. The automation systems are based on carefully selected, tried-and-tested SIMATIC controller components.
https://w3.siemens.com/mcms/process-control-systems/en/distributed-control-system-simatic-pcs-7/simatic-pcs-7-system-components/Pages/simatic-pcs-7-system-components.aspx

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DeltaV – The DeltaV Distributed Control System improves operations by harnessing predictive technologies in an easy and intuitive way to connect employers, processes, and production. This system comes equipped with I/O on demand, ultimate scalability and embedded intelligent control.
http://www2.emersonprocess.com/en-us/brands/deltav/pages/index.aspx

DeltaV

Honeywell Experion PKS – Experion Process Knowledge System (PKS) integrates an advanced automation platform and innovative software applications to improve users’ business performance and peace of mind. Unifying people with process, business and asset management, this distributed control system (DCS) helps process manufacturers increase profitability and productivity. It’s the only automation system that focuses on people — making the most of the knowledge they hold. By integrating disparate data across facilities, making the most of resources and people, and feeding it all into a unified automation system, users can achieve an operation that’s more proactive, efficient and responsive.

https://www.honeywellprocess.com/en-US/explore/products/control-monitoring-and-safety-systems/integrated-control-and-safety-systems/experion-pks/Pages/default.aspx