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Ritron DATAFLOW RTU Series Uživatelská příručka Strana 23

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DATAFLOW RTU
( A-17 )
DATAFLOW RTU
POWER OUT
ANALOG IN
ANALOG IN GND
250
Ω
RESISTOR
SENSOR
250
Ω
RESISTOR
DATAFLOW RTU
POWER OUT
ANALOG IN
ANALOG IN GND
SENSOR
V
EXCITATION
VOLTAGE
USING DATAFLOW RTU
AS THE EXCITATION VOLTAGE
USING AN EXTERNAL SOURCE
AS THE EXCITATION VOLTAGE
Figure A7 - Connecting a Current loop sensor to a DATAFLOW RTU analog input.
20.2 All analog inputs are non-isolated. All analog measurements are referenced to GROUND. Take care
when connecting the DATAFLOW RTU to external sensors.
20.3 The user can invert the input state of a DATAFLOW RTU if desired, which will cause a DATAFLOW RTU
that reads an analog signal as full scale to transmit the signal status as zero scale to another
DATAFLOW RTU. This inversion allows a positive transfer function signal to control a negative transfer
function signal without external circuitry.
20.4 Sensor excitation voltage may be supplied by the DATAFLOW RTU, using the J101 Power Out pin. For
this configuration, make sure to not exceed the maximum current drive of the pin, and ascertain your
sensor will operate on a supply voltage of Vsupply-5Volts.
21. ANALOG OUTPUTS
21.1 The two analog outputs are defined to be pins 15 and 17. (NOTE: Pins 15 and 17 are outputs only if
PJ101 and PJ102 are configured as outputs.)
These outputs are two low power outputs hardware configured as either a voltage source or a current
sink. All analog outputs are referenced to GROUND.
21.1.1 If the output pin is desired to be a voltage source, correctly set the hardware configuration. The pin is to
be hardware-configured as an output and as a voltage source. The following table defines the
characteristics of the output pin set as a voltage source. Attempting to drive a load less than the minimum
will cause incorrect output and can possibly damage the device.
PARAMETER MINIMUM MAXIMUM
OUTPUT RANGE 0 V 5 V
LOAD RESISTANCE 1000 Ω
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