C-plug, removable data storage medium for simple device replacement in case of fault, for recording configuration or engineering and application data, can be used in the following SIMATIC NET products with C-plug slot: SCALANCE X-200, X-300, X-400, S-600, CP443-1Advanced, CP343-1Advanced, CP343-1 ERPC, IE/PB-Link PNIO, .
Browse 6GK1900 / NETWORK ACCESSORIES catalog 
