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Calculating the current consumption on an example coupler

Internal current consumption

Residual current for bus modules

Sum I

(5 V) total

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The internal current consumption is indicated in the technical data for each bus

terminal. In order to determine the total requirement, add together the values of

all I/O modules in the node.

Please note the aggregate current for I/O modules. It may be necessary to

supply potential!

When the sum of the internal current consumption for the I/O modules exceeds

their aggregate current, you must use a supply module with bus power supply.

Install it before the position where the permissible aggregate current would be

exceeded.

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Example:

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Calculating the total current on the example coupler

A node with an example coupler consists e. g. of the following I/O modules:

20 relay modules (750-517) and 10 digital input modules (750-405).

Internal current consumption

Sum

In this example, the example coupler can provide 700 mA for the I/O modules.

This value is given in the associated data sheet ("Total current for I/O modules").

Consequently, an internal system supply module (750-613), e. g. in the middle of

the node, should be added.

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The maximum input current of the 24 V system supply is 500 mA. The exact

electrical consumption (I

Manual

Version 1.3.0

750-352/040-000 FC ETHERNET G3 XTR

300 mA at 5 V

700 mA at 5 V

1000 mA at 5 V

10 * 90 mA =

20 * 2 mA =

) can be determined with the following formulas:

(V)