Product Description:

The X20SL8100/PL3 module is produced by B&R Automation as part of the X20 Fieldbus Input Output Modules series. It acts as a dedicated safety logic module for distributed automation cells, handling localized interlocks, emergency-stop chains, and safe motion supervision over the plant network. The unit plugs directly into standard X20 backplanes so it can share power and bus infrastructure with standard I/O slices while adding certified safety logic. In a typical installation, it forms the core of a machine’s safety subsystem and exchanges data with drives, sensors, and higher-level PLCs to meet functional safety requirements.

Internally, the X20SL8100/PL3 is classified as a Safety Controller, so its internal logic executes fail-safe tasks independently from the main PLC. A dedicated gateway implements the openSAFETY protocol, allowing safe process data to travel together with standard telegrams on the same network segment. The module features an integrated Ethernet switch with a 2-port configuration, which enables simple line or ring topologies without extra infrastructure. Communication takes place on a fieldbus that conforms to the POWERLINK standard, ensuring synchronized cycle times across all nodes. During operation, the electronics draw only 4.3 W, which helps minimize cabinet heat dissipation when multiple safety slices are installed.

Safety application code is stored on a removable SafeKEY memory carrier, and the flash device itself is Exchangeable. On the network, the slice identifies itself as a Controlled Node and uses one address because the stack exposes a single POWERLINK interface. The second switch port is used for forwarding traffic to the next node in the line. Electrical supply is routed through the X20 power bus, and the required voltage is 24 VDC; a matching supply module is already included with the backplane to avoid separate wiring.