TwinSafe Terminals for EtherCat I/O are rated for SIL 3, conform to IEC 61508 and EN ISO 13849-1 PL e and are certified for North America. EL6900 safety PLC terminal can integrate 128 four-channel safety terminals (512 safety devices) and process 256 safety-relevant function blocks. A connection shutdown function permits interchangeable sections of equipment with safety terminals installed to be removed from the machine without causing safety system errors.