Pro-face RHAA068: Response timed out for device read command

Pro-face HMI Critical Communication

Model: GP4000/SP5000 Series | Code: RHAA068

Applicable Systems

GP4000 Series

Symptoms

GP-Pro EX display unit shows error RHAA068: Response timed out for device read command.

Possible Causes

Communication settings differ between display and PLC; wiring problems; wrong device/PLC selection; device power OFF or reset.

Troubleshooting Steps

Step 1: Verify communication settings match; check wiring and connectors; reconfirm GP-Pro EX Device/PLC settings.
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