Connecting
5.3 Electrical configuration of the ET 200AL
Distributed I/O system
System Manual, 02/2018, A5E31861578-AF
35
According to IEC 60364, cable protection is required, i.e. you must always secure the
incoming lines externally.
You must secure all incoming supply voltages with a UL/IEC approved 24 V DC/4 A fuse
(trigger characteristic type B or C).
Power supply of the configuration
Two voltage groups are available for the distributed I/O system ET 200AL: 1L+ (supply
voltage) and 2L+ (load voltage)
A second infeed may be needed to supply all the modules of a configuration with the
required voltage. Renewed voltage supply of 1L+ and 2L+ can be necessary to configure
different potential groups or because the voltage is not sufficient for all modules due to the
voltage drop. Create a power balance for the selection of the infeed point of the voltage.
Note
Turning 1L+ and 2L+ on and off
In contrast to the 2L+ load voltage, the 1L+ supply voltage may not be turned on and off in
operation.
The figure below shows a configuration with a new voltage infeed for the modules. The
different potential groups have a gray background.
Figure 5-4 Wiring of the power supply
You will find additional information on electrical configuration and the voltage drop in the
section Connecting cables for ET 200AL (Page 39).
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