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ErrorLib — Industrial Fault Code Library

Disclaimer: ErrorLib is an independent technical reference tool. While we aim for accuracy, always verify with the manufacturer’s official service manuals before performing maintenance on industrial equipment. ErrorLib is not affiliated with the brands listed.

SLF2

PC Software Communication Interruption

Schneider Electric · Altivar Machine ATV320 Variable Speed Drive

What does SLF2 mean?

An interruption in communication with PC Software. This means the drive has lost its connection to a PC running configuration or monitoring software, preventing diagnostics, parameter changes, or firmware updates. This is typically a temporary issue during commissioning or maintenance.

Common Causes

  • USB or Ethernet communication cable disconnected or damaged (e.g., between PC and drive).
  • Incorrect communication port (COM port, IP address) selected in the PC software.
  • Missing or outdated USB-to-serial driver on the PC.
  • Firewall settings on the PC blocking communication with the drive's port.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    1. Verify the physical USB or Ethernet cable connection between the PC and the drive's communication port.

  2. 2

    2. Check device manager on the PC for correct USB-to-serial converter driver installation and COM port assignment.

  3. 3

    3. Confirm the communication settings (e.g., COM port, baud rate, IP address) in the PC software match the drive's configuration.

  4. 4

    4. Temporarily disable PC firewalls or add an exception for the drive's communication port/application.

  5. 5

    5. Attempt communication with a different PC or a known-good cable to rule out PC hardware issues.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

ASFAngle ErrorCFFIncorrect ConfigurationCFI2Configuration Transfer Error
Source: Schneider Electric Altivar Machine ATV320 Variable Speed Drive
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