Carlo Gavazzi's DuplineSafe bus transmitters and relays allow Dupline fieldbus users to monitor safety-critical emergency-stop switches. The range includes a compact, bus-powered input module that can be positioned close to individual emergency stop switches, and a relay output module to monitor switch activation and generate status outputs for external equipment. Both modules are compliant with IEC/EN61508-SIL3 and EN954-1 Category 4 safety standards for emergency stop systems. A handheld configuration tool is also provided, which can be connected at any point on the Dupline bus for easy coding and testing without requiring a PC. There are also gateways to Profibus-DP and Modbus networks, allowing convenient display of safety bus information on a text unit or via a PLC or PC.
A single DuplineSafe relay module can monitor up to 63 safety input modules, and generates status outputs for connected equipment. The relay module is DIN-rail mounted and powered from an ordinary single-phase ac line, and also supports automatic and manual restart options. The input modules are IP67-rated, with compact dimensions allowing installation close to safety switches in decentralised locations. Potential-free contacts also enhance safety in hazardous environments.