F81 · PowerFlex 40
For F81 · PowerFlex 40, brand is Allen-Bradley; model / series is PowerFlex 40; fault code is F81; fault name is Comm Loss; cause is RS-485 (DSI) port stopped communicating, verified against its source on 2026-09-01.
- Brand
- Allen-Bradley
- Model / series
- PowerFlex 40
- Fault code
- F81 verified
- Fault name
- Comm Loss verified
- Cause
- RS-485 (DSI) port stopped communicating. verified
- Corrective action
- 1. If adapter was not intentionally disconnected, check wiring to the port. Replace wiring, port expander, adapters or complete drive as required. 2. Check connection. 3. An adapter was intentionally disconnected. 4. Turn off using A105 [Comm Loss Action]. verified
Verified
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What the source says
F81 Comm Loss
— literature.rockwellautomation.com, retrieved 2026-09-01
Where each value comes from
This source states these in separate places, so each value is shown with the passage that states it.
Cause
RS-485 (DSI) port stopped communicating.
Corrective action
1. If adapter was not intentionally disconnected, check wiring to the port. Replace wiring, port expander, adapters or complete drive as required. 2. Check connection. 3. An adapter was intentionally disconnected. 4. Turn off using A105 [Comm Loss Action].
— all from literature.rockwellautomation.com, retrieved 2026-09-01
Source
- literature.rockwellautomation.comhttps://literature.rockwellautomation.com/idc/groups/literature/documents/um/22b-um001_-en-e.pdf