How to Connect an Allen-Bradley PLC to Cloud SCADA

Reading Allen-Bradley Tags

ControlLogix and CompactLogix speak EtherNet/IP natively, so Merobix reads their tags directly - see connecting over EtherNet/IP. Older MicroLogix controllers can be read over EtherNet/IP or Modbus depending on model. Either way, you get the same tags the PLC exposes, mapped to a cloud dashboard.

Monitoring Compressor and Pump Packages

Much Allen-Bradley equipment in the field is packaged - compressor skids, pump controls - where a monitoring platform simply reads the PLC and reports runtime, pressures, and alarms remotely. Merobix does this over cellular without touching the control logic, so a compressor 60 miles away reports to the same dashboard as the rest of the operation. On mixed fleets, Allen-Bradley sits alongside Siemens and Modbus devices in one platform.

How to Connect Allen-Bradley PLCs to Merobix

1. Confirm the protocol and connection. Identify that your device speaks an Allen-Bradley PLC and how it is reached - a direct IP address, a serial connection, or through a cellular gateway at the site.
2. Establish connectivity to the cloud. For remote sites, a cellular edge gateway reads the local device and connects outbound to the cloud - no fixed IP, no inbound firewall rule, no VPN. On networked sites, a direct connection works.
3. Map the tags you care about. Select the registers, points, or nodes you want to monitor - pressures, levels, flows, states, alarms - and map them to named tags with engineering units. Merobix configures this for you as part of onboarding.
4. Set polling or report-by-exception. Choose how data is collected - scheduled polling for reliable links, or report-by-exception to conserve cellular data and battery on remote sites.
5. Verify data and set alarms. Confirm live values match the field, then set alarm thresholds. Sub-30-second SMS and email alarms are included, so the data is not just visible - it reaches someone when it matters.

Frequently Asked Questions