Traditional Culture Encyclopedia - Traditional festivals - I want to ask how the plc controls the solid state relay.
I want to ask how the plc controls the solid state relay.
Plc controls solid state relay. General PLC output includes triode output and relay output, so please determine what output mode it is first. Theoretically, if it is triode output, not open collector (OC) output mode, it can be directly connected with solid-state relay, but you may be in danger of electric shock, so it is suggested to add an intermediate relay for isolation. The relay output is actually a switch, which does not output voltage. But each PLC is connected in a different way. Some relays are * * * positive and some are * * * negative, so the specific situation is easy to analyze. If it is positive, the COM of PLC is connected to the negative control of SSR, and the output of PLC is connected to the positive control of SSR.
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