4.3.2 Operation
TBAI provides a 24 V dc power source for all the transducers. The inputs can be configured as current or voltage inputs using
jumpers (JP#A and JP#B). One of the two analog output circuits is 4-20 mA and the other can be configured as 4-20 mA.
TBAI Analog I/O Capacity
Input
Quantity
Analog Input Types
Output
Quantity
Analog Output Types
8 ±10 V dc, or ±5 V dc, or 4-20 mA 1 0-20 mA
2 4-20 mA, or ±1 mA 1 0-20 mA
Note With noise suppression and filtering, the input ac CMR is 60 dB, and the dc CMR is 80 dB.
Each 24 V dc power output is rated to deliver 21 mA continuously and is protected against operation into a short circuit.
Transmitters/transducers can be powered by the 24 V dc source in the control system, or can be independently powered.
Jumper JPO selects the type of current output. Diagnostics monitor each output, and a suicide relay in the I/O pack
disconnects the corresponding output if a fault cannot be cleared by a command from the processor.
YAIC Analog I/O Modules GEH-6855_Vol_II System Guide 109
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