Read PLC tags and use industrial protocols

This prepared Enterprise lab contains a PLC, an Industrial Edge device, a broker, and Linux clients for the protocol checks.

Open IoT Operations, then PLC tags, to inspect each tag’s value, quality, unit, and protocol mapping.

Use the Linux client to browse the PLC’s OPC UA address space, then read the conveyor’s Boolean value.

Use a bounded subscription to observe this Boolean node while a second client changes it.

A second client writes false to the same node while the first client observes it.

The observer reports the changed value, completes its observation, and returns to the prompt.

Press Control C to interrupt a longer observation and return to the prompt.

A Boolean node rejects an invalid value, leaving the last accepted value unchanged.

Return to PLC tags to confirm the same Boolean value and the unchanged temperature reading.

Writing one to the mapped Modbus coil restores the same PLC tag to true.

Read input register two: the value two hundred and fifty represents twenty-five degrees in this mapping.

An unmapped register is refused, while the valid temperature reading remains available.

Use the separate Modbus server for a writable holding register, then read back the value forty-two.

On the CoAP server, POST creates a temperature resource with the starting value twenty.

GET reads that resource, and PUT updates it to twenty-six point five.

Updating an unknown resource returns not found and leaves the existing resource unchanged.

Open Edge connectors and set the broker, group, and edge-node identifiers used in the forwarded topics.

Edit the PLC connector to read the temperature node and publish it as a metric named temperature.

Saving a mapping leaves it stopped, so you decide when polling and forwarding begin.

Start the connector, then inspect the exact metric delivered to Broker1 in Topics.

Add a second connector for the Modbus coil, then confirm its Boolean metric at the same broker.

An unavailable destination is refused without changing the saved broker or clearing your draft.

Stop both connectors and confirm that their data-topic counters no longer increase.

Reopen the lab to check the saved mappings, destination, and stopped states before continuing.

You have read and changed PLC tags, checked three industrial protocols, and controlled edge forwarding.