4.3.3
Specifications
Item
TBAI Specification
Number of channels
12 channels with 10 Analog Inputs (AI) and 2 Analog Outputs (AO)
AI types supported
Inputs 1 to 8: ±5 V dc, ±10 V dc, or 4–20 mA
Inputs 9 to 10: 4–20 mA or ±1 mA
Input accuracy
±0.1% of full scale over the full operating temperature range
Outputs
24 V outputs provide 21 mA each connection
Maximum lead resistance
15 Ω maximum two-way cable resistance, cable length up to 300 m (984 ft)
Output load
800 Ω max for 4-20 mA output
Fault detection
Monitor total output current
Check connector ID chip for hardware incompatibility
Size
10.16 cm wide x 33.02 cm high (4.0 in x 13 in)
4.3.4
TBAI Diagnostics
Diagnostic tests are made on the terminal board as follows:
•
The terminal board provides the voltage drop across a series resistor to indicate the output current. The I/O pack creates a
diagnostic alarm (fault) if either of the two outputs goes unhealthy.
•
Each cable connector on the terminal board has its own ID device that is interrogated by the I/O pack. The ID device is a
read-only chip coded with the terminal board serial number, board type, revision number, and the JR, JS, JT connector
location. When this chip is read by the I/O pack and a mismatch is encountered, a hardware incompatibility fault is
created.
4.3.5
TBAI Jumper Configuration
The terminal board is configured by jumpers. For the location of these jumpers, refer to the installation diagram. The jumper
choices are as follows:
•
Jumpers JP1A through JP8A select either current input or voltage input.
•
Jumpers JP1B through JP8B select whether the return is connected to common or is left open.
•
Jumpers JP9A and JP10A select either 1 mA or 20 mA input current.
•
Jumpers JP9B and JP10B select whether the return is connected to common or is left open.
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