A F071 fault code in your Allen-Bradley PowerFlex 40 drive indicates a network loss. This means the drive is unable to communicate with other devices on the DeviceNet network it's connected to. Here's a breakdown of the F071 fault on PowerFlex 40 drives:

Several factors can contribute to a network loss and trigger an F071 fault:

• Cable issues: A loose, damaged, or disconnected cable connecting the drive to the DeviceNet network can cause communication problems.
• Node configuration errors: Incorrect node addressing or configuration settings on the drive or other devices on the network can lead to communication failures.
• Device malfunction: In rare cases, a malfunctioning DeviceNet adapter (22-COMM-D module) within the drive itself might be the culprit.

Effects:

• The drive will fault and stop operation.
• The motor connected to the drive will coast to a stop.
• An F071 fault code will be displayed on the drive's Human Interface Module (HIM) or keypad.

Troubleshooting:

Here's how to troubleshoot an F071 fault on your PowerFlex 40 drive:

1. Check Network Cables: First, ensure all DeviceNet cables are securely connected to the drive and other network devices. Inspect the cables for any visible signs of damage or wear.
2. Verify Node Address: Consult the DeviceNet network documentation and confirm that the node address assigned to the PowerFlex 40 drive is correct and unique within the network.

Inspect Network Devices: Check the status of other devices on the network. If possible, use network diagnostic tools to identify any communication errors or malfunctions with other devices that might be affecting the overall network health