Modbus Master Command Response Timeout

What does I xx .Command yy .ResponseTimeout mean?

This boolean tag indicates that the Modbus master did not receive a response from the slave device within the configured timeout period after sending a specific Modbus command (Command yy). A value of 1 (Occurrence) means the command failed to complete due to the slave's unresponsiveness. This can halt data exchange for that command.

• Modbus slave device is offline, unpowered, or non-responsive
• Incorrect slave address configured for Command yy in the module's command list
• Physical communication line break or severe network congestion
• Timeout value set too low in the module's configuration for the slave's response time

Click steps to track your progress.

1. 1

   Verify the Modbus slave device is powered on, operational, and correctly addressed.

2. 2

   Check the configured Modbus slave address for Command yy matches the physical slave device's address.

3. 3

   Inspect the serial communication cable for continuity and proper termination.

4. 4

   Increase the Modbus command timeout value in the module's configuration if slave response times are slow or variable.