Communication control circuit
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If DCS uses a communication point as the input for a control loop, is it feasible to have a loop with a control valve? Is there anything I need to pay attention to? The weight of the feeding tank is transmitted via a signal; when the weight reaches a certain level, the control valve is closed
It’s feasible; I’m not sure what DCS system you use, but generally inter-station communication is required to reach the station where the valve is located
It depends on what protocol you use for communication.
Sure, there’s no difference in terms of the control loop itself. What matters is whether the reliability and timeliness of the communication signals meet the requirements; if necessary, it may be necessary to consider using a redundant configuration.
If it is communication between two control systems, few organizations use such a method of control, as reliability and real-time performance cannot be guaranteed in such cases.
Such control is not allowed according to the design specifications, but if you really want to use it, it can certainly be implemented
It’s okay to use this for controlling non-critical points; after all, the reliability of such circuits compared to analog signals is somewhat lower. Do not use this method for controlling critical points.
Sure, no problem. Reliability? If reliability is in doubt, buses can’t be used at all. By ensuring real-time transmission, it is possible to use the AO output to control another system to close the valve.