SST-PFB-CLX PROFIBUS DP Remote I/O Scanner f/ AB ControlLogix REV 6.006. SST Woodhead SST-PFB-CLX PROFIBUS DP Remote I/O Scanner Module for Allen-Bradley ControlLogix processors, 1 x RS-232 Serial Configuration Port (CONFIG), 1 x RS-485 Interface Port (PROFIBUS DP), enables communication between a ControlLogix processor and DP remote I/O devices on a PROFIBUS network.