Product Description:

The X20cSC2212 module is a safety-rated slice manufactured by B&R Automation for the X20 Fieldbus Input Output Modules series. Installed on a remote backplane, it adds certified safety I/O to decentralized automation nodes, allowing emergency-stop chains and light-curtain feedback to be handled inside the fieldbus segment instead of the central PLC. By combining safe inputs, pulse outputs, and redundant driver circuits, the unit helps an overall machine reach performance levels required by EN ISO 13849 without additional standalone relays.

Each safety input channel follows Type A monitoring and accepts OSSD signals within an off-delay of <500 µs, so contact faults are recognized almost immediately. Two safety output drivers are rated for 0.5 A per channel and are implemented as Type B1 semiconductor sources that switch a nominal 24 VDC. The same potential is used on the pulse generator pins, ensuring the module’s pulse outputs propagate test signals without introducing mixed voltages. Overvoltage category II insulation distances are maintained between logic and field lines, and the safe state forces a low level or complete cutoff when any discrepancy is detected.

The module offers 6 pulse outputs for channel cross-monitoring, 6 safe inputs for guard devices, and 2 safe outputs for actuator shutdown, letting designers build safety functions with minimal wiring. Its enclosure carries an IP20 protection rating for cabinet mounting, while the electronics withstand 15 g shock loading and continuous 1 g vibration during machine operation. When an internal or external fault occurs, the output drivers transition to the predefined low or cutoff state so field devices lose power in a predictable manner. This behavior supports stable operation in control systems that include inductive loads and routine switching transients.