Tbci Specifications; Tbci Diagnostics - GE Mark VIeS System Manual

5.4.4 TBCI Specifications

Item
Number of channels
Excitation voltage
Input current
Input filter
Power consumption
Fault detection
Size

5.4.5 TBCI Diagnostics

Diagnostic tests to components on the terminal boards are as follows:
• The excitation voltage is monitored. If the excitation drops to below 40% of the nominal voltage, a diagnostic alarm is set
and latched by the I/O pack.
• YDIA I/O pack performs periodic self test of all contact inputs. In a alternative sequence each contact is forced open or
closed and reads the status, if any contact fails the test a fault is created.
• If the input from this board does not match the TMR voted value from all three boards, a fault is created.
• Each terminal board connector has its own ID device that is interrogated by the I/O pack. The connector ID is coded into
a read-only chip containing the board serial number, board type, revision number, and the JR1/JS1/JT1 connector
location. When the chip is read by the I/O pack and a mismatch is encountered with what is configured in the ToolboxST
application, a hardware incompatibility fault is created.
126 GEH-6855_Vol_II
TBCI Specification
24 contact voltage input channels
S2: Nominal 24 V dc, floating, 20 V dc min, 32 V dc max
S3: Nominal 48 V dc, floating, 43 V dc min, 53 V dc max
S2 (for 24 V dc applications):
First 21 circuits draw 2.5 mA (10 kΩ)
Last three circuits draw 9.9 mA (2.40 kΩ)
S3 (for 48 V dc applications):
First 21 circuits draw 2.5 mA
Last three circuits draw 10 mA
Hardware filter, 4 ms
20.6 W on the terminal board
Loss of contact input excitation voltage
Non-responding contact input in test mode
Unplugged cable or loss of communication with I/O board: contact status is displayed as False
and Unhealthy.
33.02 cm high x 10.16 cm wide (13.0 in x 4.0 in)
GEH-6855_Vol_II Mark VIeS Functional Safety Systems Volume II
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