Pro-face RHAA034: Error responded for device read command

Pro-face HMI Major Communication

Model: GP4000/SP5000 Series | Code: RHAA034

Applicable Systems
GP4000 Series

Symptoms

  • GP-Pro EX display unit shows error RHAA034: Error responded for device read command.

Possible Causes

  • The device/PLC is returning an error code on a read request from the display unit.

Troubleshooting Steps

  1. Step 1: Check the device/PLC manual for details on error codes; verify communication settings.
    Communication restored and error cleared

How to Reset

Repower or reset the display unit after correcting the root cause.

Related Pro-face Fault Codes

Source: Pro-face GP-Pro EX Maintenance/Troubleshooting Manual, T.7.1 Common Display errors (proface.tech/otasuke official)

Category: HMI