Pro-face RHAA042: Illegal response for device write command

Pro-face HMI Major Communication

Model: GP4000/SP5000 Series | Code: RHAA042

Applicable Systems

GP4000 Series

Symptoms

GP-Pro EX display unit shows error RHAA042: Illegal response for device write command.

Possible Causes

An error occurred on the device/PLC side.

Troubleshooting Steps

Step 1: Check that communication settings and connected device settings are specified properly.
Communication restored and error cleared

How to Reset

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

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

Category: HMI