20 • Fieldbus coupler 750-342
Hardware
Modular I/O System
ETHERNET TCP/IP
3.1.2.2 Device
supply
The supply is made via terminal bocks with CAGE CLAMP® connection. The
device supply is intended both for the system and the field units.
Fig. 3-2: Device supply
G
034201e
The integrated internal system supply module generates the necessary voltage
to supply the electronics and the connected I/O modules.
The fieldbus interface is supplied with electrically isolated voltage from the
internal system supply module.
3.1.2.3 Fieldbus
connection
Connection to the fieldbus is by an RJ45 connector. A category 5,
shielded/unshielded twisted pair cable (S-UTP) with an impedance of 100
Ohm
±
15% is mandatory as a connecting line for the 10BaseT Interface.
The connection point is physically lowered for the coupler/controller to fit in
an 80 mm high switch box once connected.
The electrical isolation between the fieldbus system and the electronics is
achieved by means of DC/DC converters and optocouplers in the fieldbus in-
terface.
Contact
Signal
1
TD +
Tr
2
TD -
Transmit -
3
RD +
R
4
free
5
free
6
RD -
Receive -
7
free
8
free
Fig. 3-3: RJ45-connector and RJ45 connector configuration