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With M251 - Ethernet IO Scanner, is it possible to communicate with Advantys STB Modules ( STB on Remote IO Node Architecture).

You can configure Advantys STB in IOScanner of M251 PLC by selecting it as generic device. To configure the generic device added on the Modbus TCP IOScanner, fill in the parameters in these two tabs: 

1. Modbus TCP Slave Configuration 
2. IO Scanner Channel Configuration 

Please take note only Ethernet2 Port can be configured in M251 PLC as Modbus TCP IO Scanner and there is a limitation of 64 number of Device that can be configured in M251 PLC. Also in IOScanner Channel configuration you can Read 125 registers and write 123 registers in each channel. 
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