WAGO 750-341 Manual page 26

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The WAGO-I/O-SYSTEM 750
Power Supply
2.7.2.2 Alignment
Recommendation
A stable network supply cannot be taken for granted always and everywhere.
Therefore, regulated power supply units should be used in order to guarantee
the quality of the supply voltage.
The supply capacity of the coupler/controller or the internal system supply
module (750-613) can be taken from the technical data of the components.
Internal current consumption*)
Residual current for bus
terminals*)
*) cf. catalogue W4 Volume 3, manuals or Internet
Example
The internal current consumption is indicated in the technical data for each
bus terminal. In order to determine the overall requirement, add together the
values of all bus modules in the node.
Attention
If the sum of the internal current consumption exceeds the residual current
for bus modules, then an internal system supply module (750-613) must be
placed before the module where the permissible residual current was
exceeded.
Example:
Recommendation
With the WAGO ProServe® Software smartDESIGNER, the assembly of a
fieldbus node can be configured. The configuration can be tested via the
integrated accuracy check.
Current consumption via system voltage:
5 V for electronics of the bus modules and coupler /
controller
Available current for the bus modules. Provided by
the bus power supply unit. See coupler / controller
and internal system supply module (750-613)
Coupler 750-301:
internal current consumption:350 mA at 5V
residual current for
bus modules :
sum I(5V)
A node with a PROFIBUS Coupler 750-333 consists of 20 relay
modules (750-517) and 10 digital input modules (750-405).
Current consumption:
20* 90 mA = 1800 mA
10* 2 mA =
Sum 1820 mA
The coupler can provide 1650 mA for the bus modules. Consequently,
an internal system supply module (750-613), e.g. in the middle of the
node, should be added.
1650 mA at 5V
: 2000 mA at 5V
total
20 mA
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