Modbus Fault

What does SLF mean?

This fault signals an interruption in communication on the Modbus bus, preventing the drive from exchanging data with a Modbus master or remote display terminal. Causes often include physical bus issues or a disconnected remote display terminal when HMI command is enabled. This results in a loss of external control, monitoring, or parameter access.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Consult the relevant product documentation for detailed Modbus troubleshooting procedures.

2. 4

   Verify Modbus parameters such as baud rate, parity, and slave address are consistent across all devices.