The functions of various cabinets in the instrument cabinet room
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Hey there, may I ask what are the safety barrier cabinets, relay cabinets, system cabinets, terminal cabinets, and so on in the instrument cabinet room of a chemical plant used for? What functions do they serve? Could you please provide a simple and clear explanation? Thank you very much for your help!
The names of the cabinets are clearly stated – what more needs to be explained?
Both the safety barrier cabinet and the relay cabinet are used for isolation; the safety barrier can isolate both analog and digital signals, while relays are generally used to isolate digital signals； The system cabinet is the cabinet for the control system, containing components such as the CPU and various cards; the terminal cabinet is where the wiring for the field instruments is done. Overall, the field instruments are connected to the terminal cabinet, which is in turn connected to the safety barrier cabinet or relay cabinet; the safety barrier cabinet or relay cabinet is then connected to the system cabinet.
@The phrase \"one line connecting heaven and earth\" is very apt. Safety barrier cabinets and relay cabinets are both used for isolation; safety barriers can isolate both analog signals and digital signals, while relays are generally used to isolate digital signals； The system cabinet is the cabinet for the control system, containing components such as the CPU and various cards; the terminal cabinet is where the wiring for the field instruments is done. Overall, the field instruments are connected to the terminal cabinet, which is in turn connected to the safety barrier cabinet or relay cabinet; the safety barrier cabinet or relay cabinet is then connected to the system cabinet.
It is recommended to take a look at the electrical design drawings to see where the electricity comes from and how it is supplied to various substation and distribution rooms; this will help understand why these distribution cabinets are necessary