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C Input/Output Boards, Continued

The I

C AIO board makes available 8 Analog Outputs (AOs), 8 Analog

Inputs (AIs), and 2 Digital Inputs (DIs).

Analog Input/Output

Board

Figure 2-9: I

C Analog Input/Output Board

There are eight AO circuits available on the AIO board. The AO is able to

output currents from 0 to 25mA, although a 4 to 20mA range can be

selected in software. The range above 20mA is used to meet Namur

compliant out-of-range fault readings.

Analog Outputs

Two pins are used for each AO. One pin is a common ground. The other

pin is the AO current output pin. Each AO current output pin has

protection against high overvoltage using diode circuitry. In addition,

there is 400V isolation between the AO on the connector and the rest of

the I/O board.

AOs can be modified for voltage output by adding a resistor across the

AO terminal. Value of the resistor is dependant on the desired voltage

range, subject to Ohm's law (V=IR). Accuracy of the output is dependant

on the tolerance of the resistor. The maximum supported voltage output

is 23V, corresponding to approximately a maximum 920 ohm resistor.

A5E31405710001 2-13

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Simplicity 1693407 Especificações Página 48