Loop-powered display unit
Wiring
15
Terminal
Description
Auxiliary terminals (electrically connected internally)
Functional grounding:
• Panel-mounted device:
Terminal on the rear of the housing
• Field device:
Terminal in the housing
5.2
Connection in 4 to 20 mA mode
The following diagrams show how the process display unit is connected in 4 to 20 mA
mode.
Connection without backlighting
Connection with backlighting
Connection with transmitter power
supply and transmitter
LED
-
+
-
-
+
+
I
Y
1
A0017704
1 Transmitter power supply
+
+
I
Y
1
-
-
LED
-
+
A0017705
1 Transmitter power supply
Connection with transmitter power
supply and transmitter using the
auxiliary terminal
-
-
+
+
I
Y
1
LED
-
+
A0017706
1 Transmitter power supply
+
+
I
Y
1
-
-
LED
-
+
A0017707
1 Transmitter power supply
