Tested with the following hardware and software
TwinCAT SoftSPS 2.9 Build 1031
zenon project with one driver and communication to four TwinCAT soft PLCs and a Beckhoff BC bus controller. One TwinCAT soft PLC is running locally on the PC, where the zenon project is running. A second one is running on another PC. The two other TwinCAT soft PLCs are running on two Beckhoff CX1000 CE terminals.