What causes fault code AB-PV-NOCOMM (PanelView HMI — No Controller Communication)?

Ethernet cable between HMI and switch disconnected or damaged. Controller IP address changed — HMI still pointing to old address. Controller in Program mode — some tag connections drop when not in Run mode. HMI application has wrong controller path configured in RSLinx Enterprise or FactoryTalk Linx. Network switch port issue — try a different port. HMI Ethernet adapter set to wrong IP address or subnet

How do I fix fault code AB-PV-NOCOMM?

Check HMI communication status — look for red X or broken link icon on screen objects. Press and hold the Windows button on PanelView Plus to access settings — check IP address configuration. Ping the controller IP address from the HMI (if accessible) or from a laptop on the same network. In FactoryTalk View ME, check the Communication Setup — verify shortcut points to correct controller IP. Check Ethernet cable and switch port — verify link LEDs on both HMI and switch. Verify controller is in RUN mode and not faulted. If HMI was recently downloaded, verify the runtime application communication path is correct

PanelView HMI — No Controller Communication

AB-PV-NOCOMM

PanelView Plus or PanelView 5000 HMI cannot communicate with the ControlLogix or CompactLogix controller. Screens show stale data or communication error indicators.

high allen-bradley plc

allen-bradley panelview hmi communication ethernet/ip factorytalk

Probable Causes (ranked)

Ethernet cable between HMI and switch disconnected or damaged
Controller IP address changed — HMI still pointing to old address
Controller in Program mode — some tag connections drop when not in Run mode
HMI application has wrong controller path configured in RSLinx Enterprise or FactoryTalk Linx
Network switch port issue — try a different port
HMI Ethernet adapter set to wrong IP address or subnet

Fix Steps

1 Check HMI communication status — look for red X or broken link icon on screen objects
2 Press and hold the Windows button on PanelView Plus to access settings — check IP address configuration
3 Ping the controller IP address from the HMI (if accessible) or from a laptop on the same network
4 In FactoryTalk View ME, check the Communication Setup — verify shortcut points to correct controller IP
5 Check Ethernet cable and switch port — verify link LEDs on both HMI and switch
6 Verify controller is in RUN mode and not faulted
7 If HMI was recently downloaded, verify the runtime application communication path is correct

Field Trick

On a PanelView Plus 7, press and hold the upper-right corner of the screen for 5 seconds to open the FactoryTalk Diagnostics viewer. It will show you the exact communication error message, including which controller path is failing. This is faster than pulling out a laptop.

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