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21.1.2 If the output pin is to be a current sink, correctly set the hardware confi
See Figure A8 for an example of how to connect a current loop meter to theDATAFLOW RTU.
PARAMETER
OUTPUT RANGE
LOAD RESISTANCE
the output to a desired state at power ON of the device. The fail-safe condition forces the output to a desired
state if an RF data link problem is detected. Refer to DATAFWW RTU Software/Programmers Manual for
21.3
Meter excitation voltage may be provided by the DATAFLOW RTU using the Power Out pin of connector
JJO I. If the Power Out pin is used as the excitation supply make sure that the maximum current drive of the pin
is not exceeded and that your indicator will operate on a supply voltage ofVsupply-5.5Volts.
21.4
It is not recommended to use the analog output as a warning indicator. If used, it is not available to be mapped
used in this manner can have only one analog signal sent to it. NOTE: Be sure to not exceed the load drive
capability if an analog output is used for a warning indicator.
configured as an output and as a current source. The following table defines the characteristics of the output pins
set as a current sink. Attempting to drive a load less than the minimum will cause incorrect output and possibly
can damage the device.
NOTE: ''Ev" 1s exc1tanon voltage.
21.2
The analog outputs can be programmed to have both initial and fail-safe conditions. The initial condition forces
details on setting these conditions.
to the corresponding analog input of the other unit; meaning that aDATAFLOW RTU having an analog o utput
Installation/ Operation
Figure A8. - Connecting a Current loop indicator to a DA TAFLOW RTU analog output.
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MINIMUM
0mA
/Ev-5.5l/.02 .Q
I
USINGDATAFI.OWRTU
ASIBEEXCTTATIONVOLTAGE)
!+
'
0-
!INDICATOR i
1
I.USING ANEXIERNAL SOURCE
ASTHEEXOTATIONVOLTAGE
j!NDIC'ATOR
i ()
I
+
IEXCITATIONI@)
+
VOLTAGE
V
(A-18)
ation. The pin is to be hardware
MAXIMUM
20mA
gur
I
DATAFLOW KIV
POWEROUTI
ANALOGOuT I
ANALOG OUT GND
DATAFI.OW KTU
POWEROUTI
ANALOG OUT I
ANALOG OUT GND
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