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3.2
Configuration without T Connector and with Power Supply Connec-
tor
Definition
In a configuration with a looped-through field bus and a power supply, the
DP/ASi link is connected directly to the PROFIBUS-DP.
The power supply is gated by means of the power supply connector with the
PROFIBUS-DP in a single cable.
Advantage
You do not require a T connector.
The power supply is fed along the bus cable, i.e. an external power supply of
the slave station is not required.
Constraint
If a slave station is disconnected from the bus, "bus traffic" is interrupted for
the slave stations that follow it.
Bus traffic may be disrupted for the slave stations still on the bus owing to
the absence of the terminating resistor.
The degree of expansion with a power supply connector is limited (refer to
section 3.4).
Cables
You use cables of different design for the installation:
Installation
Fig. 3-2 shows a possible installation for the configuration with a power sup-
ply connector and without a T connector:
Figure 3-2
Distributed I/O System DP/ASi Link
EWA 4NEB 710 6055-02b
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.
External
power supply
PS-
SV
cntr
PROFIBUS-DP
PROFIBUS-DP and power supply looped through on DP/ASi link
Configuration Options
DP/ASi link
DP/ASi link
3-3
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