The Protect PSC1 is a modular safety controller for safe signal processing of safety sensors and switches. It can be configured for tailor-made safety-related solutions, whether individual machines or complex installations. The controller consists of freely programmable compact PLCs with I/O extension modules for signal processing of mechanical and electronic safety switchgear. It can be equipped with a universal communication interface to enable the selection and implementation of different fieldbus protocols using software. It requires only one hardware element to create a connection to most common forms of fieldbus systems.