Compact Switch Module CSM 377 Connection of SIMATIC S7-300 and up to 3 additional stations to Industrial Ethernet with 10/100 Mbit/s unmanaged switch, 4 RJ45 ports, external DC 24V power supply LED diagnostics, S7-300 module, including electronic device manual on CD-ROM. SCALANCE CSM 377 Compact Switch Module, Unmanaged Switch, 4x 10/100 Mbit/s RJ45 for connecting SIMATIC S7-300 to IE Integration of small machines into existing automation networks. Cost-effective construction of small, local Industrial Ethernet networks with up to three additional stations. Robust, industry-compatible station connections and secure data communication with PROFINET-compliant RJ45 connectors with additional strain and bending relief through locking on the housing. Use of uncrossed connecting cables possible thanks to integrated autocrossover function. Simple and quick diagnostics via LED on the device.Compact Switch Module CSM 377 for connecting SIMATIC S7-300 and up to 3 additional participants to Industrial Ethernet with 10/100 Mbit/s unmanaged switch, 4x RJ45 ports, external DC 24 V.The system is supplemented by various RJ45 connectors, a standard cable and a stripping tool.