Rules for current consumption and power loss of an ET 200PA SMART
For their operation, the ET 200PA SMART modules and S7-300 modules draw the power they
need from the backplane bus as well as, if necessary, from an external load power supply.
● The current consumption of all modules from the backplane bus must not exceed the
amount of current that the IM 650 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.
Note
When planning the dimensions of the cabinet, make sure that the temperature in the cabinet
does not exceed the permitted maximum of 60 °C even when the temperature outside the
cabinet is high.
You can find the values for the current consumption and power loss of a module in the technical
specifications of the relevant modules.
2.3.2 Operation of the ET 200PA SMART with process I/O on a grounded supply
The following provides information on the overall configuration of an ET 200PA SMART on a
grounded supply (TN‑S system). The topics covered here are:
● Disconnecting devices, short-circuit and overload protection in accordance with
DIN VDE 0100 and DIN VDE 0113
● Load power supplies and load circuits
Grounded supply
With grounded supplies, the neutral conductor of the supply system is grounded. A single
ground fault between a live conductor and ground or a grounded part of the plant triggers
activation of the disconnecting devices.
Assignment planning
2.3 Configuring the electrical structure
ET 200PA SMART
24 Operating Instructions, 06/2019, A5E34192013-AB
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