T.4.2 Communication fails on specific screens

Is an error code displayed on the GP?

If communication fails on specific screens, first check the error code displayed on the screen.

Typical error No.

Main cause

RHAA006 to RHAA007

Check if any noise is generated. Check the cable connection and connector engagement.

RHAA010 to RHAA012

This error is displayed during Ethernet communication. Check the port No and network environment.

RHAA033 to RHAA035

This error is caused by the connected device.

For details, see the "GP-Pro EX Device/PLC Connection Manual".

RHAA036 to RHAA037*1

Address outside of the device range is used.

RHAA038*1

An attempt was made to read data which is write-only.

RHAA039*1

An attempt was made to write to data which is read-only.

RHAA040 to RHAA045

This error is caused by the connected device. For details, see the "GP-Pro EX Device/PLC Connection Manual".

RHAA065 to RHAA066*1

This is a typical error displayed when communication using Ethernet fails. Check the communication settings and IP address.

RHAA067 to RHAA070*1

This is a typical error displayed when communication using RS-232C/422/485 fails. Check the communication settings and cable connection.

*1 This chapter describes these errors only. For other errors, see the following.
T.7.1 Settings common to all Display models

Cause

If an communication error occurs only when a specific screen is opened, a part or a script may be using the unsupported device addresses used on the base screen where the error occurred. Device address

Solution

Follow the procedure below to check the addresses used on the screen on which an error occurred.

  1. With GP-Pro EX, open the screen on which an error starting with RHAA036 to RHAA039 occurred.

  2. From the [Project] menu of GP-Pro EX, expand [Utility] and select [Cross Reference].

  3. When the [Cross Reference] dialog box appears, select [All] from the [Target] drop-down list.

  4. Check if any of the following points are true for the addresses displayed in blue according to the error code.

  5. Error codes RHAA036 and RHAA037

Check if any addresses outside of the range of the device addresses supported by GP-Pro EX are used.

Check if the Data Display or D-script tries to read a write-only device.

Check if a switch or a D-script tries to write to a read-only device.