Echelon LonPoint Module - Manual (Page 88)

8-4 Installing the AI-10 Analog Input Module
Input 2
4-Wire 0-24mA
Remotely Powered
In
p
u
t
#
2
4WIR RES 2WIR VOLT
This setting is used for connecting 0-20mA,
4-20mA, 4-24mA, or 0-24mA intelligent
transmitters that are powered by either their own
power supply or a separate power supply. The
maximum allowable current range is 0-25mA. In
this setting the AI-10 does not supply power to the
current loop.
Input 1
2-Wire 4-20mA
Current Loop Powered
Input #1
4WIR RES 2WIR VOLT
This setting is used for connecting 4-20mA
intelligent transmitters that are powered by the
current loop provided by the AI-10 module. The
maximum allowable current range is 0-25mA in
order to permit fault conditions to be detected
(open as 0mA, short circuit as 25mA). This mode
is not suitable for measuring passive resistive
devices. Minimum loop voltage is 12VDC.
Input 2
2-Wire 4-20mA
Current Loop Powered
In
p
u
t
#
2
4WIR RES 2WIR VOLT
This setting is used for connecting 4-20mA
intelligent transmitters that are powered by the
current loop provided by the AI-10 module. The
maximum allowable current range is 0-25mA in
order to permit fault conditions to be detected
(open as 0mA, short circuit as 25mA). This mode
is not suitable for measuring passive resistive
devices. Minimum loop voltage is 12VDC.
Input 1
Passive Resistive
Sensor
Input #1
4WIR RES 2WIR VOLT
This setting is used for connecting passive
resistive sensors to the AI-10 module. Resistance
is measured by passing a controlled current
through the sensor and then measuring the
resulting voltage across the AI-10 screw terminals.
Measurements of passive resistive devices may
only be taken using the RES mode - the 2WIR
mode is not suitable for this purpose. See text
below for a discussion of the range and software
settings for the RES mode. In this mode 3.5V is
provided on the (+) terminal and programmable
current sink (25mA or 400mA on the (-) terminal).
Input 2
Passive Resistive
Sensor
In
p
u
t
#
2
4WIR RES 2WIR VOLT
This setting is used for connecting passive
resistive sensors to the AI-10 module. Resistance
is measured by passing a controlled current
through the sensor and then measuring the
resulting voltage across the AI-10 screw terminals.
Measurements of passive resistive devices may
only be taken using the RES mode - the 2WIR
mode is not suitable for this purpose. See text
below for a discussion of the range and software
settings for the RES mode. In this mode 3.5V is
provided on the (+) terminal and programmable
current sink (25mA or 400mA on the (-) terminal).