3
Installation
page 17
ELC X-Series-V1.3-09.16-GB
subject to technical alterations
3.2.12 X3: PROFIBUS T-coupler
Connector pin assignment:
The shield has to be put on Pin 1 = BUS GND.
Isolate with shrunk-on sleeve.
Pin assignment X3:
Designation
Number Description
technical
BUS GND
X3.1
GND isolated for PROFIBUS
Shield connection PROFIBUS
BUS A
X3.2
Data line PROFIBUS A
Bus signal A
BUS B
X3.3
Data line PROFIBUS B
Bus signal B
The T-coupler connection may be used as a PROFIBUS repeater. Via the T-coupler (see Fig.
12) the PROFIBUS-data lines A and B as well as their reference ground may be applied
(galvanically isolated) to another slave device. The T-coupler already contains a termination
according to Fig. 11. Solely a bitrate of 500kbit is applicable. If the T-coupler connection is not
required X3 may be left open.
Fig. 12: Schematic of the T-coupler connection
1.4
1.3
1.2
1.1
2.4
2.3
2.2
2.1
3.1 3.2 3.3
X3
X1
X2
galvanic isolation
T-coupler
1
3