On PID diagrams, how are interlocks such as SIS and ESD, as well as system control and shutdown functions, represented? Are there any examples?
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On a PID diagram, how are interlocks such as SIS and ESD, process control logic, as well as operations related to control and shutdown represented? Are there any examples?
A PID diagram is a graphical representation used to illustrate the structure and logic of a control system, typically including key elements such as process variables, control variables, controllers, and actuators. Among them, SIS (Safety Instrumented System) and ESD (Emergency Shutdown System) are common safety devices in industrial process automatic control systems. Their function is to promptly cut off sources of hazard during emergencies, thereby preventing accidents from occurring. These safety devices are typically represented in PID diagrams as purple devices, and they are connected to process control logic as well as other elements such as processes, controls, and shutdowns. .