GE Mark VIe System Manual page 72

2.3.2 Dual
The Mark VIeS Dual Control Modes can provide:
• One out of two (1oo2) voting, SIL 3 high/low demand for de-energize-to-trip
• Two out of two (2oo2) voting, SIL 2 low demand for energize and de-energize-to-trip
• Hardware fault tolerance (HFT): 1
Dual Controllers
Dual Mark VIeS controllers work as a
controller set synchronizing data every frame
(sweep). Each controller receives inputs on
both I/O networks, and sends output
commands on designated I/O network.
Dual I/O Network
Ethernet based dual I/O network
supports both centralized and
distributed I/O modules.
Sensor Sensor
A A1
Single Dual Sensor
Sensor Dual sensors
Single sensor wired to
wired to a independent
single input input modules
module with with independent
dual I/O I/O networks to
network to controller set.
controller set.
72 GEH-6721_Vol_I_BP
R
Sensor
Sensor
A2
A
TMR Fanned
Input
Single sensor is
fanned through a
common terminal
board to three
independent input
packs, 2oo 3
voting done in the
controller set.
GEH-6721_Vol_I Mark VIe and Mark VIeS Control Systems Volume I
PC Based Gateway
PC based communication interface,
options:
- OPC-DA server
- OPC-UA server
- Modbus master
S
Embedded Controller Gateway
Embedded controller for
communication interface,
options:
- OPC-UA server
- Modbus slave
Actuator
TMR Outputs
Voted on Terminal
Board
The three output
packs receive an
output command
from designated
controller, the
common terminal
board then
performs 2oo 3
voting and controls
the actuator.
Public Information
Third Party
Control
System
Acutator
1oo2 De-energize
to Trip in Output
Modules
Two independent
output modules
receive the output
command from
designated
controller,
combination of two
creates 1 oo2 de -
energize to trip
function across the
two modules.