This video discusses the 5 Major DCSs in the automation field,
The video discusses the following,

1) Emerson DeltaV
2) Siemens PCS 7
3) ABB 800xA
4) Honeywell Experion
5) Yokogawa Centum

You can read the entire blog post in the below link,

https://www.automationcontrolstepbyst...