TESTO 6681 Profibus Instruction Manual page 30

testo 6681 Profibus
30
Wiring diagram for 4-wire system
(0 to 20 mA/4 to 20 mA/0 to 1 V/0 to 5 V/0 to 10 V)
24V
-
+
20 to 30 V
AC/DC
+
-
0 V
1 Feed connection cables of the two, or optionally three, channels through
opened M 16 x 1.5 screw connection (item (8) in Overview of terminals,
chapter 1.3.3.1, page 28.
2 Strip the cable ends, clamp wire end ferrules on and screw to channel
terminals as shown in diagram.
3 Close M 16 x 1.5 screw connection (item (8) in Overview of terminals,
chapter 1.3.3.1, page 28.
- 1.3 Commissioning
If the channels have to be galvanically isolated, a separate
mains unit must be used for each channel.
CH1
CH2
- -
+ +
Requirement for the connecting cable of the supply:

Insulated with cross-section of at least 0.25 sq. mm.

The supply line must be secured against exceeding 8 A.

An OFF switch must be installed in an easily accessible
position close by and be marked as such.
CH3
-
+
2 or 3 channels
0 to 20 mA/
4 to 20 mA/
max. load per 500 
0 to 1 V/0 to 5 V/0 to 10 V