TP Adapter networks showing controllers from another network

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Issue

Two separate Twisted Pair Adapter networks connected to separate AS-P controllers appeared to be cross communicating. When viewed with the Twisted Pair Adapter commissioning tool, devices from both networks were visible from either network. This resulted in RP-C controllers experiencing IP address conflicts and communication issues. Testing also showed that multiple adapters placed near each other could be detected even when no field wiring was connected.

Product Line

EcoStruxure Building Operation

Environment

Building Operation Automation Server
SpaceLogic RP-C
Twisted Pair Adapter (TPAE)

Cause

The issue was identified on the 2-wire side of the Twisted Pair Adapter networks. The twisted pair network cables from two separate communication legs were terminated on adjacent rail-mounted terminals within the same control panel. Although the communication legs were not connected together, devices from both networks became visible on either network, resulting in RP-C controller IP address conflicts and communication issues.

Resolution

The communication legs were re-established and modifications were made to provide greater physical separation between the rail-mounted terminals. After these changes, the two networks reported only their respective field controllers and the cross communication issue was removed. Validation confirmed that each communication leg reported only the controllers expected on that network.