Alarm Lock Eagle 6000 Especificaciones descargar pdf (Pagina 22)

Eagle Research Corporation

REV 11.1.11 Page | 18

OPTIONAL ANALOG OUTPUT CARD (XA-AO)

The Analog Output Module and connecting cable provides two two-wire, loop-powered,

optically isolated, precision 4-20mA outputs. This module interfaces with the

XARTU/5 to provide 4-20mA outputs for flow rate, pressure, or numerous other

controls and monitoring applications. Up to four modules can be connected to the RTU.

Power for the digital interface section of the XA-AO is selectable by using its DIP-

switches, and can be supplied by Vcc of the RTU, or from the main supply voltage. The

AO module interfaces to the RTU via the standard I

C serial interface bus. The RTU

requests the desired mA outputs from the AO module using this bus. An I

C digital I/O

chip is used to send the information to the analog output section of the AO board.

The analog output section of the board derives its power from the current loop(s), and

is optically isolated from the digital control interface section. The analog output section

receives commands from the digital I/O chip through opto-isolators. Commands are in

the form of a serial data stream. The AO module provides 4-20mA output signals with

a resolution of 1 part in 65536 (16 bit), or 0.00024mA. The D/A also allows for over-

ranging of the output to a minimum of 3.5mA and a maximum of 24mA. The field

interface to the D/A is a simple two-wire connection. Reverse polarity protection is

provided.

The XA-AO will function properly in temperatures from –40

F to +160

F, and in

conditions of high humidity (including condensing environments). Software calibration

of the 4-20 mA outputs is provided for easy calibration.

Fig. 6 - XA-AO Analog Output Card

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