Beckhoff Automation's TwinSafe Bus Terminal
KL6904 TwinSafe bus terminal contains a safety-rated controller, four safety-rated outputs and interfaces with Profibus and EtherCat. KL1904 has four digital inputs with potential-free contacts rated at 24 Vdc. KL2904 has four 24 Vdc digital outputs rated at 0.5 A. If more safety I/O points need to be controlled, multiple KL1904s can be used to handle up to 4,000 I/O points.