turck BL20 - Potential Relationships; General

D301087 0308 - BL20 CANopen 7-5
Potential Relationships
7
Potential Relationships
General
The potential relationship of a CANopen system realized with BL20
modules is characterized by the following:
 The system’s power supply to the gateway, I/O modules and the
field level is distributed via a Bus Refreshing module.
 All BL20 modules (gateway, Bus Refreshing, 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 station.
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Gateway
Power Feeding
Bus Refreshing
I/O moduleI/O module I/O module
Bus Refreshing
Logic Logic
5V
Logic
24 V
2 O 2 O 4 I
24 V24 VField-
bus
24 V230 V
Logic
DC DC
DC DC
+V -V