Assignment planning
3.6 Configuring the electrical structure
ET 200M
Operating Instructions, 12/2008, EWA-4NEB780600602-08
49
Rules on the Power Consumption and Power Loss of an ET 200M
For their operation, the S7-300 modules use the necessary power from the backplane bus as
well as, if necessary, from an external load power supply.
● The current consumption of all signal modules from the backplane bus must not exceed
the electrical output that the IM 153-x can supply to the backplane bus.
● The PS 307 power supply is dependent on the current consumption from the 24 V load
power supply; this is the result of the total of the current consumption of the signal
modules and all other connected loads.
● The power loss of all the components in a cabinet must not exceed the maximum thermal
rating of the cabinet.
Tip:When establishing the required dimensions of the cabinet, ensure that the
temperature inside the cabinet does not exceed the permissible 60°C even where
external temperatures are high
You will find the values for the power consumption and power loss of a module under the
technical specifications of the relevant modules.
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