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A BCX PE program does not read/mirror value from its child 3rd party MSTP device

Issue

A BCX PE program does not read / mirror value from its child 3rd party MSTP device (ALC IO6126).  The exact same PE program in workstation reads / mirrors value from the same 3rd party MSTP device correctly.

When the PE uses just ReadProperty(BACnetDevices\BNet_2778\Dev100\Supply_temp), controller error log file shows message of "  0x8000001e - BACnet request timeout " & " 0xfffd001f -  BACnet error ".
 

Environment

BACnet (BCX4040) ,  3rd party MSTP device ( ALC IO 6126 / IO6126 / Viconics )

Cause

Case#1) The BCX's Foreign Device configuration page ( Foreign Device table ) was set up to have an IP address of a BBMD BCX on the same IP subnet by mistake.

Case#2) The MSTP devices are consuming MSTP network resource by trying to send the token to non-existing MSTP device all the way up to ID127 as the BACMaxMaster attribute is set to 127.

Resolution

Case#1) BCX's Foreign Device Configuration / Table should be set up to have the IP address of the BBMD on the different IP subnet ( not the BBMD on the same IP subnet ).  Remove and zero out the Foreign Device Table of the problematic BBMD. 

Case#2) Change the BACMaxMaster from the default value of 127 to the MacAddress of the last MSTP device on the network.

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