Terminal Board Tbai - GE Mark VIeS System Manual

In a TMR system, analog inputs fan out to the three I/O packs. The 24 V dc power to the transducers also comes from all
three I/O packs and is diode shared on TBAI. Each analog current output is fed by currents from all three I/O packs. The
actual output current is measured with a series resistor, which feeds a voltage back to each I/O pack. The resulting output is
the voted middle value (median) of the three currents. The following figure displays TBAI in a TMR system.
SYSTEM
Noise
POWERED
Suppression
+ 24 V dc
+/-5, 10 V dc
T
N
4 - 20 m A
S
Return
+24 V dc
+/- 1 mA
N
S
4- 20 mA
Return
Open
Two output circuits
# 2 circuit is 4 -20
mA only
Signal
N
S
Return
SCOM
YAIC Analog I/O Modules

Terminal Board TBAI

8 circuits per
Terminal board
P 28 V< T>
P 28 VR
P 28 V< S>
Current Limit
JP#A
V dc
20 mA
250 ohms
JP#B
Open
Return
PCOM
2 circuits per
terminal board
P28 VR
Current Limit
JP# A
1 ma
20 mA
250
5 k ohms
ohm
JP#B
Return
S
PCOM
T
JPO
200 mA
20 mA
S
T
TMR Analog Inputs and Outputs
Public Information
<R> I/O Pack
JR1
ID
JS1
<S> I/O Pack
ID
JT1
<T> I/O Pack
ID
Application Board
(internal to I /O pack
Processor Board
(internal to I /O pack
A/D
Excitation
Current
Regulator /
Power Supply
GEH-6855_Vol_II System Guide 111
D/A