The difference between SIS and DCS system
Emerson DCS
1.DCS is used for continuous measurement, conventional control (continuous, sequential, intermittent, etc.) and operation control management of the production process to ensure the smooth operation of the production device; SIS IS USED TO MONITOR the operation status of the production device, deal with the abnormal conditions quickly, minimize the harm, and keep the personnel and the production device in a safe state.
2.DCS is a "dynamic" system, always continuous detection, operation and control of process variables, dynamic control of the production process, to ensure product quality and output; SIS is a "static" system, under normal working conditions, always monitor the operation of the production device, the system output is unchanged, no impact on the production process; In abnormal working conditions, according to the pre-designed logic calculation, so that the production device safety interlock or stop.
3.SIS is more stringent than DCS in terms of security, reliability and availability, so SIS and DCS hardware should be set independently in theory.
3005319639