Does ESD fall under SIS? I couldn’t understand that sentence.
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SIS consists of field instruments, logic processors, and actuators, all of which must be designed with safety in mind. A conventional ESD system is merely the logic processor part of SIS, which, of course, also needs to be designed safely. Its characteristic remains PID control; thanks to its robust communication capabilities, it serves as a system for integrating all automated devices in a factory. SIS requires higher levels of reliability and availability compared to DCS, and standards such as IEC61508 and IEC61511 stipulate that SIS and DCS hardware should be installed separately.
I think ESD falls under SIS, as can be seen from the LOPA analysis level. ESD hard interlocks are separate from DCS and belong to SIS.
ESD: Emergency Shutdown System; ordinary PLCs can also be used. SIS: Safety Instrumented System, which requires higher standards – relevant certifications are necessary, and if a SIS is used, the field instruments must also meet the corresponding requirements
It seems that it’s just the different certification standards for modules, systems, and field devices
Is the ESD system PID control? That can’t be right; isn’t it based on logical control?
The two are different systems; I completely agree with the view from the third floor.
SHT 3018-2003 \"Code for Design of Safety Instrumented Systems in Petrochemical Industries\" – Explanatory Notes 3.1 Safety instrumented systems are different from process interlocks used in batch control, sequence control, and process control. When process variables exceed their limits, mechanical equipment fails, the system itself malfunctions, or there is a power outage, the safety instrumented system can automatically [and manually if necessary] carry out pre-set actions to bring operators, process units, and the environment into a safe state. A Safety Instrumented System (SIS) is also known as an Emergency Shutdown System (ESD), a Safe Shutdown System (SSD), a Safety Interlock System (SIS), or a Safety Protection System (SPS). A Safety Instrumented System should utilize a programmable control system that has been certified by authoritative bodies.