Siemens 6ES5 490-8MB11 is a 40-pin screw-terminal front connector for SIMATIC S5 I/O modules, compatible with the S5-90U/-95U/F/-100U digital I/O families. It provides screw-terminal wiring for I/O channels and mates with the corresponding backplane or plant-side connection to form the interface between field wiring and the S5 module. This front connector configuration is specifically described for the S5 40-pin screw-terminal system and is used with digital input/output modules in the S5 family.
