Schmersal SFB port extender: Extension module with additional digital inputs and outputs

Wuppertal, 25. November 2025. With the new SFB port extender, Schmersal presents a powerful extension for the Safety Field Box (SFB) that significantly simplifies the connection of additional switching devices in the field. Up to four PCB modules can be connected per SFB – each of which enables the connection of additional digital I/O components. The result: maximum flexibility for customised applications in automation technology.

Non SFB-capable devices can also be integrated
A particular advantage of the SFB port extender is the possibility of connecting a large number of non-safe switching devices to the SFB. These can be easily connected and analysed via the three supported fieldbus protocols - ideal for heterogeneous system landscapes. Power is supplied directly via the SFB connection, which reduces the installation effort and simplifies system integration.

Technical features at a glance:

• Installation module for customised control panels, e.g. with illuminated buttons, EMERGENCY STOP or other digital I/O devices
• Up to 4 port extenders can be connected per SFB
• 8 digital inputs (24 VDC) for electromechanical or electronic switches
• 8 digital outputs (24 VDC / 300 mA) for LED indicator lights, lamps and other loads (total current max. 800 mA)
• 2-channel safety input for the connection of safety switches with contacts

With the SFB port extender, Schmersal offers a future-proof solution for expanding decentralised control systems – compact, powerful and versatile.