Help: After the DO output from the DCS, how does it flow in the electrical circuit?
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It is connected to the main control circuit of the electrical system, usually as a normally closed contact
It depends on whether the output voltage is 24V DC; or, via the relay on the dashboard, it can be 220V AC, as mentioned by the friend above
For the secondary control circuit of electrical systems, it is recommended to find an electrical control schematic diagram, which will make things clear at a glance.
Add an intermediate relay; connect the DCS output to the relay coil circuit, and connect the electrical cabinet to the relay contact circuit to achieve isolation