User manual

3-7
Distributed I/O System DP/ASi Link
EWA 4NEB 710 6055-02b
3.5 Configuration without Power Supply Connector
In a configuration with a separate power supply, every slave station is sup-
plied with power separately. This power supply must not be fed on the bus
cable.
The T connector for connecting PROFIBUS-DP is imperative for continuous
looping of the PROFIBUS-DP.
You do not feed the power supply over the bus (2-core instead of a 5-core
cable).
A slave station can be disconnected at any time from the bus without ”bus
traffic” being interrupted for the slave stations beyond it, because the PROFI-
BUS-DP is looped through T connectors.
You use cables of different design for the installation:
 If you wish to use prefabricated Siemens cables, please turn to sec-
tion 4.4.4.
 If you wish to prepare your own cables, please turn to section 4.4.7.
Fig. 3-6 shows a possible installation for the configuration without a power
supply connector.
DP/ASi link
External
power supply
PROFIBUS-DP
External
power supply
Two-wire-
cable (!!)
DP/ASi link
Figure 3-6 PROFIBUS-DP looped through T connectors –
external power supply fed separately to every slave station
Definition
Advantage
Cables
Installation
Configuration Options