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What could cause the error "Unknown Modbus Exception code Error ID: OL9-21504" when trying to connect to the Concept IEC simulator?

One possible explanation for this error is a conflict between Concept and the v6.0 Ethernet MBX driver. Uninstalling the v6.0 Ethernet MBX driver and rebooting the PC will correct the issue.

Legacy KB System (APS) Data: RESL182599 V1.0, Originally authored by MiMe on 03/13/2007, Last Edited by MiMe on 03/13/2007
Related ranges: Concept
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