The raspberry pi GPIO interface board is designed to isolate 8 digital inputs or outputs from the Pi. The board can act as general purpose isolation buffers (without the raspberry pi) with up to 1.2A total output current and up to 24V inputs and outputs. This means it can be used to drive relays or small servo motors and interface with PLC's and VSD... etc.
The datasheet can be found at: bit.ly/IU5Saa
Features • 8 x 0-24V inputs. • 8 x 0-24V outputs that can supply up to 1.2A total. • 8 x Pi GPIO LED status indicators. • 8 x Input switches to configure the inputs and outputs.