GE Mark VIe Instruction Manual page 12

Non-critical data that is being used for non-essential monitoring is usually implemented without redundancy. Redundant and
non-redundant I/O coexists in most control systems.
The overall scheme of software voting, diagnostics, and online repair capability is known as Software Implemented Fault
Tolerance (SIFT). Its significance is that application software in each of the three control sections performs the voting rather
than a single hardware voter that would compromise reliability by introducing a potential single point failure.
12 GEI-100728A
1. Failure of 1 I/O Pack inhibits monitoring of 1 sensor
2. Smaller & more cost-effective than "fanned" inputs (3 versus 9 I/O Packs &
IONET communications)
Public Information
Mark VIe Controls System Redundancy Options