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2020/09
8.2
Potential relationships
8.2.1
General
The potential relationship of a CANopen system realized with BL20 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 BL20 modules (gateway, Power Feeding and I/O-modules), are connected capacitively via
base modules to the mounting rails.
Separate power supplies for the system and the field level allow a potential-free installation.
The block diagram shows the arrangement of a typical BL20 with the ECO gateway BL20-E-GW-CO.
8.2.2
Potential-free installation
In a potential-free installation, the reference potentials of control and load circuitry are galvanically
isolated from each other.
A potential-free installation is necessary with
All AC load circuits (for example, when using the Power Feeding module
BL20-PF-120/230VAC-D)
Floating DC load circuits
The potential-free installation does not depend on the method of grounding.
Abb. 2: Block diagram BL20-station with ECO-CANopen-gateway
Gateway
Power Feeding
I/O-Modul
I/O-Modul
5V
Feldbus
2 I
2 O
Logik
Logik
Logik
Modulbus
GND
GND U
L
U
Sys
U
L
GND
U
L
PE
PE
Summary of Contents for BL20-E-GW-CO
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