A safety PLC, or safety controller, monitors all the safety functions of a machine in one programmable unit: emergency stops, safety doors, light curtains, two-hand controls, enabling switches and safe speed. When a function is triggered, it brings the machine to a safe state. Compared with a cabinet full of separate safety relays, a safety PLC needs less wiring, gives clearer diagnostics and lets you change the safety logic in software instead of rewiring. SCN supplies the samos PRO system from Wieland Electric, configured in the licence-free samos PLAN6 software.<\/p>\n
The range: samos PRO COMPACT<\/a>, the modular base controller from 45 mm wide; samos PRO MOTION<\/a> with safe speed, standstill and direction monitoring for up to two axes; I\/O expansion modules<\/a> with safe digital and analog inputs, up to 12 per controller; and gateway modules<\/a> for CANopen, PROFIBUS-DP and EtherCAT. For one or two safety functions a safety relay<\/a> is often enough. See also PLC systems<\/a> and all control systems<\/a>.<\/p>\n How to choose:<\/strong> list the safety functions and the required performance level from your risk assessment, count the safe inputs and outputs, decide whether you need safe motion, and choose the network to the main PLC.<\/p>\n A safety PLC is a programmable controller built and certified for safety functions, with redundant processing, continuous self-tests and outputs that switch off on any internal fault. It handles emergency stops, guards and light curtains up to PL e to EN ISO 13849-1 and SIL 3 to IEC 62061, as the Wieland samos PRO MOTION does with suitable sensors.<\/p><\/details>\nFrequently asked questions<\/h3>\n
What is a safety PLC?<\/summary>