The programmable gateways of the BL20 (IP20) and BL67 (IP67) I/O systems.
They can be used as autonomous PLCs for control tasks or as network devices for fast signal preprocessing in the periphery. For this, the gateways have a fieldbus interface for PROFINET, Modbus TCP, Ethernet/IP™ or PROFIBUS-DP; in addition the gateways support standard Ethernet and serial communication. The extension modules communicate via the internal module bus with the gateway and can be configured independently of the fieldbus protocol.