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Guidelines for Electrical Installation
D301239 1013 - BL67 AIDA PROFINET 7-4
7.2 Potential relationships
7.2.1 General
The potential relationship of a Ethernet system realized with BL67 modules is characterized by the
following:

The system supply of gateway and I/O-modules as well as the field supply are realized via one power
feed at the gateway.

All BL67 modules (gateway, Power Feeding and I/O-modules), are connected capacitively via base
modules to the mounting rails.
The block diagram shows the arrangement of a typical BL67 station with PROFINET gateway.
Figure 7-1:
block diagram,
BL67 station
gateway power feeding I/O-module I/O-module
5 V
V
o
fieldbus
2 I
2 O
Logik
V
i
GND
PE
V
i
V
o
logic logic
Logik
module bus
PE
V
o
V
i
GND PE GND
PE
I > I >
logic