Power Distribution Modules
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6.4 Bus Refreshing modules
Bus Refreshing modules are used to distribute 5 VDC to the internal BL20 module bus, as well as to
distribute a nominal voltage of 24 VDC (permissible range according to EN 61 131-2) to the various
BL20 modules, when building up BL20 stations with gateways without integrated power supply.
The adjoining power supply module and modules to the left are potentially isolated.
When using BL20 gateways with an integrated power supply unit (BL20-GWBR-…), no additional
Bus Refreshing module is needed to distribute 5 VDC to the internal BL20 module bus, as well as the
nominal voltage of 24 VDC.
Bus Refreshing modules eliminate the necessity to separately distribute the system or field voltage
to each BL20 I/O module. Depending on the planned application, it is possible to build tailor-made
groups of modules with different potentials by selecting appropriate Bus Refreshing modules. Bus
Refreshing modules are available in slice design. They are mounted on to base modules with ten-
sion clamp or screw connections. The dusty grey color of the base modules for Bus Refreshing mod-
ules clearly distinguishes them from the base modules designed for BL20 I/O modules.
LED displays
Error signals and diagnostic statuses are indicated via LEDs on the module. The corresponding diag-
nostic information is transmitted to the gateway via diagnostic bits.
6.4.1 Module overview
BL20-BR-24VDC-D
Fig. 37: Wiring diagram BL20-P4x-SBBC
DANGER
Dangerous electrical voltage (120/230 V)
Acute danger to life due to electric shock!
† Turn of the voltage supply
† Secure the voltage supply against restart.
NOTE
When using Bus Refreshing modules, this must be mounted immediately to the right of
the gateway. This and a special base module guarantee the 5 VDC supply to the gateway.
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