Page
15
3.12
Uplink Unit Providing Current Loop Power
In this scenario, the Prophet Uplink is providing the power for the sensor thru the current
loop. Typically the Prophet Uplink is mounted directly to the sensor using a 3/4-inch
NPT connection. The Uplink can supply no more than 24 mA to the sensor. Please note
the return wire is connected to JP3 - 2 (IN), and not to GND. The electronics of the
Uplink unit route the return to ground internally.
Existing
Instrumentation
-
+
GND
IN
+24
Prophet Uplink
Module (J3)
3
2
1
Figure 9
Uplink Providing Current Loop Power
3.13
Uplink Unit Placed in Series with Existing Current Loop
(B24VDC and existing instrumentation)
In this scenario, the Prophet Uplink is wired into an existing, established current loop on
the positive side (between the current loop source and the instrumentation).
PLC
Termination
(current
loop
source)
+
-
+
-
+
-
GND
IN
+24
Prophet Uplink
Module (J3)
3
2
1
Figure 10
Uplink Installed in an Existing Current Loop
