Installation Guidelines S5-115F Manual
PS 951 power supply module
The PS 951 power supply module supplies the following:
• CPU
• I/O bus
• Control circuits of the input/output modules.
The following table gives you an overview of the power supply modules which can be used in the
S5-115F.
Table 3-3. Overview of Power Supply Modules for S5-115F
Power Supply
Module
Input
Voltage
Output
Current
Galvanic
Isolation
Remarks
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6ES5 951-7ND21
6ES5 951-7ND31
6ES5 951-7ND41
24 V DC
24 V DC
24 V DC
Max. 7 A
Max. 7 A
Max. 7 A
No
Yes
Yes
High-level external voltage monitor
required
To be replaced by 6ES5 951-7ND41
--------------------
Please note the following points when using the PS 951 power supply module:
• S5-115F central controllers and expansion units may only be operated with the power supply
modules listed in Table 3-3.
These power supply modules have been prototype-tested and approved for use in safety-
related systems.
• The PS 951-7ND31 and PS 951-7ND41 power supply modules have safe electrical isolation to
DIN VDE 0160. The 24 V DC input voltage must be a functional extra-low voltage in accordance
with DIN VDE 0100 or a comparable standard. If not, the PE terminal must be connected to the
protective ground wire.
• The PS 951-7ND21 power supply module has
no galvanic isolation
between the primary and
secondary sides. If you want to use this module, you will require high-level monitoring
facilities for the 5 V DC operating voltage on the secondary side. The 24 V DC input voltage
must be switched off automatically in the event of overvoltage.
Note
Since the S5-115F is operated without fans for safety reasons, the power supply
module must not be loaded with more than the rated value of 7 A/5 V. This means that
the current consumption of all the modules used must not exceed 7 A.
• Magnetic voltage stabilizers must not be connected direct on the input side of the power
supply module!
If you use magnetic voltage stabilizers in parallel circuit branches, there is a likelihood of
overvoltages, which could destroy the power supply module! Please consult your local
SIEMENS regional office in such cases.
3-32
EWA 4NEB 811 6148-02
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