Industrial control systems can be categorized in two types: open-loop and closed-loop systems. The open-loop control system is a continuous control system that provides no feedback from its output.

How 'Observers' Enhance Closed-loop Control How 'Observers' Enhance Closed-loop Control. DN Staff. May 14, 2007. 3 Min Read. Take a look at ... If you look at the block diagram on ... disturbances, ...