Pro-face RHAA084: Too many requests to write; request ignored

Pro-face HMI Minor Communication

Model: GP4000/SP5000 Series | Code: RHAA084

Applicable Systems

GP4000 Series

Symptoms

GP-Pro EX display unit shows error RHAA084: Too many requests to write; request ignored.

Possible Causes

Write operations continued at a timing exceeding the communication driver processing speed (e.g. 9600 baud).

Troubleshooting Steps

Step 1: Check D-script or other settings that write continuously at high speed; lower the write frequency.
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