Pro-face RHAA054: Cannot write the read only device

Pro-face HMI Critical Communication

Model: GP4000/SP5000 Series | Code: RHAA054

Applicable Systems
GP4000 Series

Symptoms

  • GP-Pro EX display unit shows error RHAA054: Cannot write the read only device.

Possible Causes

  • The protocol driver detected write-in of a read-only device.

Troubleshooting Steps

  1. Step 1: Check the device/PLC manual; set write operations to read/write addresses.
    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