May I ask how the start and stop of motors controlled by DCS are achieved in the electrical cabinet room? Thank you

Thank you\ud83d\ude0a

The device that physically controls the start and stop of a motor is a contactor, or an electrically operable circuit breaker. The DCS provides one or two passive node access circuit breakers or contactors to enable remote control of the motor. The control logic is implemented in the DCS software. The control nodes are wired directly into the switchgear.

The principle of DCS in controlling motors can be understood through the following points. First, examine the control schematic diagram (it is important that process engineers specify the control requirements). Second, motor start/stop control can be carried out through on-site control (i.e., control at the production site), remote control (i.e., DCS control), or MCC control (control via the electrical panel; this may not be necessary in some processes). The on-site start/stop buttons, the panel-mounted start/stop buttons, and the output signals from the DCS (which are usually sent to the relay circuits within the electrical panel) are connected in series to form a hardware circuit that controls the start/stop of the motor. Third, motor interlock controls (such as shutdown in case of faults, emergency shutdowns, or process-related interlocks) are typically implemented through programming in the DCS, with the resulting signals being sent to the relays in the electrical panel; these signals are then connected in series or parallel within the control circuit to achieve the interlock functionality. Of course, emergency shutdowns and fault-induced shutdowns usually involve both hard control (through electrical components) and soft control (through logical programs). Fourth, read the drawings more often on your own

It is generally achieved through communication with intelligent motor protectors