Pro-face RHAA050: Unknown devices exist in write devices

Pro-face HMI Critical Communication

Model: GP4000/SP5000 Series | Code: RHAA050

Applicable Systems
GP4000 Series

Symptoms

  • GP-Pro EX display unit shows error RHAA050: Unknown devices exist in write devices.

Possible Causes

  • Wrong device and address are created via Indirect Address Designation.

Troubleshooting Steps

  1. Step 1: Check if Indirect Address Designation settings are within the recognizable address range.
    Communication restored and error cleared

How to Reset

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

Related Pro-face Fault Codes

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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