F81

Comm Loss

Allen-Bradley · PowerFlex 4 Adjustable Frequency AC Drive

What does F81 mean?

Communication has been lost with an adapter or the connected network. This can be due to intentional disconnection, issues with wiring, or failure of a port expander or adapter. The drive's response to this loss is configured by parameter A105 [CommLoss Action].

Additional Steps

Steps 1–2 are listed in Priority Fix.

  1. 3

    Inspect communication cables and connectors for any signs of physical damage or improper termination.

  2. 4

    Confirm that communication parameters such as A103 [CommData Rate], A104 [CommNode Addr], and A107 [CommFormat] are correctly configured for the network.

Source: Allen-Bradley PowerFlex 4 Adjustable Frequency AC Drive
Open Manual (Page 15)