Siemens AG 6FX1127-4AA01 Printed Circuit Board

Siemens Sinumerik Sirotec servo-CPU printed circuit board, part number 6FX1127-4AA01, is a replacement card used inside legacy Siemens CNC systems. This module is identified on listings as CBX-3315A and carries the internal references 548 274 9101, tying it to the Sinumerik Sirotec servo-control family. Available from resellers as used or refurbished stock, the 6FX1127-4AA01 is sold as a PC board/card module designed to drop into the appropriate Sinumerik cabinet slot to restore or upgrade servo CPU functionality. In typical installations, the servo-CPU card coordinates axis motion, servo drive commands, and feedback processing within the Sinumerik Sirotec control architecture, making it a key component for maintaining precise motion control in legacy machines. Compatibility is defined by the machine’s control cabinet hardware revision and the CBX-3315A subassembly, so users should verify host system compatibility before replacement.