S5-115F Manual
Installation Guidelines
Load power supply
The load power supply supplies the following:
•
Input and output circuits (load circuits)
•
Sensors and actuators.
For monitoring reasons, both control and load circuits should be connected to the same power
supply.
We recommend that you use our load power supply units from the 6EV1 series. If you decide to use
load power supply units of a different type, please note that you must monitor the output
voltage. The output voltage of a 24 V DC load voltage supply unit must not exceed 30 V DC.
Modules may be destroyed at higher voltages.
Warning
For SIMATIC modules supplied with functional extra-low voltages
(V 60 V DC, V 25 V AC), you require load power supply units with safe (electrical)
isolation to DIN VDE 0160.
!
Load power supply for non-floating modules
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If you use non-floating modules, you must create a common reference potential for the internal
control circuits of the PLC and for the load circuits. For this reason, connect the reference potential
of the load power supply unit with the ground connection of the PLC (PE terminal or ). The
ground connection is permanently connected to the internal reference potential of the controller.
Load power supply for floating modules
Note
If you use switched-mode power supply units to supply floating analog modules and
BEROs, you must first run this supply over a mains filter.
Dimensioning the load power supplies
The electronic short-circuit protection of DO modules activates only when triple the rated current
is exceeded. For this reason, dimension the load power supply units in such a way that the power
supply can deliver the current required for switching off in the case of a short-circuit at an output.
If the load power supply unit has not been sufficiently dimensioned, this can result in a current
higher than the rated current flowing for an extended period in the case of a short-circuit at
digital outputs, without the short-circuit protection of the DO module activating. Overrange
operation can destroy the module.
EWA 4NEB 811 6148-02
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