1.6.3 Input Processing
All inputs are available to all three controllers, but there are several ways that the input data is handled. For inputs existing in
only one I/O module, all three controllers use the same value as common input without voting, as displayed in the table
below. Inputs that appear in all three I/O channels may be voted to create a single input value. The triple inputs may come
from three independent sensors. They can also be created from a single sensor by hardware fanning at the terminal board.
Mark VIe Controller Redundancy Available IONet Topology
Simplex
Dual
TMR
Control System Overview
One I/O pack with one IONet
The number of IONets in a system equals the number of controllers.
One I/O pack with two IONets
Two I/O packs with one IONet per pack
Three I/O packs with <R> one IONet to controller <R>, <S> one IONet to controller
<S>, and <T> two IONets with one to controller <R> and one to controller <S>
Fanned – three packs, one IONet/pack with one terminal board
Dedicated – three packs, one IONet/pack with three separate S-type terminal boards
Simplex – One I/O pack, One IONet
Dual – One I/O pack, Two IONets
Dual – Two I/O Packs, One IONet
Dual – Three I/O Packs with 1, 1, 2 IONets
Public Information
GEH-6721_Vol_I_BP System Guide 43