User manual

Page 34 915U-2 Wireless I/O
Page 34 User Manual
Single Ended Current Inputs (AIN 3 & 4 only)
Single-ended current input mode is useful if the sensor loop is grounded to the 915U-2
module. Devices can be powered from the 24V Analog Loop Supply (ALS) generated
internally from the module.
The Dip Switches are used to determine if the inputs will be current or voltage.
Dip Switches 1 & 2 are used for or Analog 3 and Dip Switches 3 & 4 are used for
Analog 4
For Current set both Dip Switches to the “On” position, for Voltage set both to “Off”
V-
AIN3
AIN4
ALS +24V
Loop
Powered
Sensor
+
-
mA
Externally
powered
sensor
Power
supply
+
_
1
ON
2 3 4 5 6
Dip Switch setting
for Current I/P
915U-2
GND
Figure 19– Single Ended Current Inputs