SIS system and DCS system use and configuration of the essential difference analysis, more profound know DCs in order to control, SIS in order to protect! What is the difference between SIS system and DCS system?

DCS--distribution control system decentralized controls, plant control level systems, conventional data acquisition, device control

This system is completed.
Sis--safty Instruments System Security instrumentation systems, interlock system, generally do the plant process equipment safety protection control, sometimes also includes the unit safety protection control.
What is the difference between SIS system and DCS system?
　　SIS system uses the real-time platform to support each function module on different servers distributed operation, so that the server load balance, using different network cards connected to the control system and SIS system, to ensure network isolation. All data in the control system can only be used in one-way transmission. The standard interface means that the modules running on the platform are less dependent and the modules can be developed and run in stages.
DCS system using environmental conditions (folding): Working Group Ambient temperature: -10℃~ 45 ℃; maximum monthly average relative humidity: ≤90%; maximum daily average relative humidity: ≤95%; Altitude: No more than 2000 m; Working conditions: No conductive particulate dust, no corrosive metals and chemical substances that destroy insulation, The use of the site should be protected against rain, snow, wind, sand facilities, the surrounding is not allowed to fill with water vapor or more serious mold existence.

SIS system and DCS system use and configuration of the essential difference analysis, more profound know DCs in order to control, SIS in order to protect! What is the difference between SIS system and DCS system?