Number of cabinets

First, it is necessary to know the number of analog and digital inputs that each cabinet can accommodate, as well as whether there are any other controllers or devices that need to be placed in the cabinet. Based on this information, divide the total analog and digital quantities by the number that can be accommodated in a single cabinet, and round up to determine the required number of cabinets. If specific capacity information is not available, it is recommended to consult the relevant equipment supplier or refer to the equipment manual. .

At least 6 or 7 are needed; the space inside is quite limited. If components such as relays and surge protectors are added, more cabinets will be required. The exact number needs to be determined by the manufacturer.

1. Determine the DCS system to be used; generally, the standard cabinets offered by different manufacturers vary. 2. Determine which applications require signal isolation, and consider the size and quantity of isolators needed. 3. With the above information, the manufacturer can estimate the number of cabinets required.

It’s too general; a detailed I/O table is needed to confirm this with the manufacturer. All that redundancy, those safety barriers, isolators, relays, surge protectors, and so on. And your requirements for the accessories (such as whether the relay should be integrated or separate) ； Hardware requirements include things such as DO controllers, card modules, safety barriers, surge protection, terminals, as well as whether the power cabinet and the network cabinet should be separate or not. . . It varies among different manufacturers

It’s not enough to just write down the numbers of digital and analog signals; you first need to understand the components inside the cabinet, and analyze each of those components. Based on my limited knowledge, relays take up the majority of the space inside a cabinet, followed by modules, terminals, safety barriers (necessary for intrinsically safe instruments), and surge protectors (needed to protect outdoor instruments from lightning). Other elements such as power fuses can be ignored. As for the types of signals, all DI signals that require relays are involved, as well as DO signals for motor inputs. Analog signals go directly in and out of the modules. For a simple calculation, for a cabinet with dimensions of 600*800*2200, it’s sufficient to reserve 20% of the space for IO points, and 70% for relays; this gives a general estimate. I welcome any different opinions for discussion.