Siemens SIMATIC S7-1500/ET 200MP System Manual page 354

For altitudes > 2000 m the following constraints apply for the maximum specified ambient
temperature:
Restrictions of the maximum ambient temperature specified with regard to the
installation altitude
Installation altitude
-1000 m to 2000 m
2000 m to 3000 m
3000 m to 4000 m
4000 m to 5000 m
1)
Note
• Linear interpolation between altitudes is permissible.
• The derating factors compensate for the decreasing cooling effect of air in higher altitudes
due to lower density.
• Note the mounting position of the respective module in the technical specifications. The
basis is the standard IEC 61131-2:2017.
• Make sure that the power supplies you use are rated for altitudes > 2000 m.
• The displays of the S7-1500-CPUs are designed for an altitude of ≤ 3,000 m. When
operating the device at altitudes > 3,000 m, you may experience problems with the CPU
display in rare cases; however, these do not affect operation of the CPU.
Effects on the availability of modules
The higher cosmic radiation present during operation at altitudes above 2000 m will also
start to have an effect on the failure rate of electronic components (the so-called soft error
rate). In rare cases this can result in a transition of the module into the safe state, especially
for safety modules. However, the functional safety of the module is fully retained.
Note
The F-CPUs are certified for operation in safety mode up to the maximum altitude listed in the
product data sheet. All other markings and certifications are currently based on an altitude of
up to 2000 m.
Automation system
System Manual, 01/2023, A5E03461182-AK
Base value for application of the derating factor is the maximum permissible ambient temperature
in °C for 2000 m.
16.5 Mechanical and climatic ambient conditions
Derating factor for ambient temperature
1.0
0.9
0.8
0.7
Technical specifications
1)
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