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4.1.3.2 Analog Output Hardware
The YAIC includes two 0-20 mA analog outputs capable of 18 V compliance running simplex or TMR. A 14-bit
digital-to-analog converter (DAC) commands a current reference to the current regulator loop in the YAIC that senses current
both in the YAIC pack and on the terminal board. In TMR mode, the three current regulators in each YAIC share the
commanded current loads among themselves. Analog output status feedbacks for each output include:
•
Current reference voltage
•
Individual current (output current sourced from within the YAIC)
•
Total current (as sensed from the terminal board, summed current in TMR mode)
Each analog output circuit also includes a normally open mechanical relay to enable or disable operation of the output. The
relay is used to remove a failed output from a TMR system allowing the remaining two YAICs to create the correct output
without interference from the failed circuit. When the suicide relay is de-activated, the output opens through the relay,
open-circuiting the analog output from the customer load that is connected to the terminal board. The mechanical relay has a
second normally open contact that is used as a status to indicate position of the relay to the control and includes visual
indication with an LED.
YAIC Analog I/O Modules
Public Information
GEH-6855_Vol_II System Guide 95
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