GE Mark VIe System Manual page 42

1.6.2.4 Triple Pack, Dual Network (TPDN) I/O Module
This is a special case mainly intended for outputs, but also applies to inputs. The special output voting/driving features of the
TMR I/O modules can be used in a dual control system. The inputs from these modules are voted in the controller.
• Redundant data acquisition
• Output voting in hardware
• Redundant network
• Online repair
Two of the I/O packs are connected to separate networks delivering input data and receiving output data from separate
controllers. The third I/O pack is connected to both networks. This pack delivers inputs on both networks and receives outputs
from both controllers.
1.6.2.5 Hot Backup I/O Module
This is a special case mainly intended for a small set of I/O packs used as a gateway to another network. In this configuration,
there are dual I/O packs, dual network but only one I/O pack is communicating to the gateway network at one time, the other
I/O pack operates in a backup mode. The inputs from active module are used in the controller.
• Redundant data acquisition
• Redundant network
• Online repair
The two I/O packs are both connected to both networks, but only communicates to the controller and the gateway network. If
a failure occurs on the active I/O pack, the backup I/O pack becomes the active I/O pack, thus maintaining communication
with the connected devices.
1.6.2.6 Triple Pack, Triple Network (TPTN) I/O Module
For medium integrity applications with medium to high reliability sensors, one sensor can be fanned to three I/O packs. The
special output voting/driving features of the TMR I/O modules can be used in a TMR control system. The inputs from these
modules are voted in the controllers. A fanned input terminal board can be populated with three packs providing redundant
data acquisition for a set of inputs.
• Redundant data acquisition
• Output voting in hardware
• Redundant networks, packs, and controllers
• Online repair
Each of the I/O packs are connected to separate networks delivering input data and receiving output data from separate
controllers.
42 GEH-6721_Vol_I_BP GEH-6721_Vol_I Mark VIe and Mark VIeS Control Systems Volume I
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