What is the PI Interface or PI Connector necesary for a PLC Allen Bradley GuardPLC 1600?
You can connect directly to the PLC via Modbus using PI Interface for Modbus Ethernet PLC. Alternatively, Rockwell offers an OPC Server for those PLC's. You can then use the PI Interface for OPC DA to connect to the OPC Server in which the PLC is exposed. Depending on how the rest of your equipment is connected, both options can be recommended.
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Emerson Automation Solutions
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