TN DAS149 How to address DASMBCTP messages getting revoked due to message timeouts.

Description

This article from InSource discusses communications getting revoked on the Wonderware DASMBTCP DA Server.

• Author: Joseph Hefner
• Published: 10/24/2016
• Applies to: DASMBTCP 2.0 or later.

Details

When this problem occurs you will see messages similar to the one below:

This is often caused by having the maximum outstanding message value to high. To resolve this you can simply decrease this number to one as below:

Scenario 1) Modbus Bridge is in use:

If you are using a Modbus Bridge, this setting is at the bridge level. Change this value to a 1 and then deactivate and re-activate the DASMBTCP.

Scenario 2) No Modbus bridge is in use:

If no bridge is in use this setting change should be made at the Modbus object level as below. Again , this value should be set to 1 and them deactivate and re-activate the DASMBTCP.