User manual

3-6

Distributed I/O System DP/ASi Link

EWA 4NEB 710 6055-02b

3.4 Configuration with Several Power Supply Connectors

In configurations with a power supply connector (refer to sections 3.2 and

3.3), the power supply is fed along the bus cable.

This configuration is limited by the following factors:

 If the power supply and the PROFIBUS-DP field bus are fed on the same

cable, the following values apply to the length of the bus cable between

the power supply connector and the last slave station connected:

Table 3-2 Length of bus cable when PROFIBUS-DP and power supply

are fed on the same bus cable

Current Loading Max. Cable Length

< 1 A 80 m

< 2 A 40 m

< 4 A 20 m

 Not more than 4 A may be looped through the power supply connector.

The input power of the ET 200 modules and of the DP/ASi link limits the

number of modules that you can connect.

You make allowance for several power supply connectors per segment.

Fig. 3-5 shows a possible installation for the configuration with several

power supply connectors.

External

power supply

PROFIBUS-DP

PS-

cntr

External

power supply

PROFIBUS-DP

PS-

cntr

In this case you can use a 2- or 5-core cable, because the two ”left” con-

nections for ”external power supply” and ”PROFIBUS-DP” are not

bridged.

DP/ASi link

Figure 3-5 Configuration with several power supply connectors

Constraint for

installation with

one power supply

connector

Remedy

Configuration Options