The code 6ES7647-6CG05-0AX0 refers to a Siemens SIMATIC component, likely part of a SIMATIC IPC627 industrial PC, but your description "Voter 1 I/O Bus Module" points towards a Siemens 6DS1315-8AC Voter 1 module, often used for redundant PLC systems (like S7-400), where it handles I/O distribution and voting logic, suggesting it's a key interface for synchronizing redundant inputs/outputs in critical automation. 

In essence:
You're likely dealing with a redundant PLC setup, possibly a Siemens S7-400 system, where the Voter 1 module (6DS1315-8AC) synchronizes inputs, and the 6ES7647-6CG05-0AX0 is either the related IPC or another component in that overall redundant architecture.