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Calculating the current consumption on the fieldbus coupler:

Internal current consumption of the coupler

Total current for I/O 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 a standard fieldbus coupler/controller:

A node configuration with 20 relay modules (750-517) and 30 digital input

modules (750-405) should be attached to a fieldbus coupler/controller:

Internal current consumptions

Sum of internal current consumptions

However, the fieldbus coupler can only provide 1650 mA for the 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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Recommendation

Utilize the smartDESIGNER feature WAGO ProServe

fieldbus node assembly. You can test the configuration via the integrated

plausibility check.

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

electrical consumption (I