Information On Insulation Tests, Protection Class, Degree Of Protection And Rated - Siemens SIMATIC S7-1500 System Manual

Technical specifications
15.5 Information on insulation tests, protection class, degree of protection and rated voltage
PFDavg, PFH values for HF-CPUs
Below you will find the probability of failure values (PFDavg, PFH values) for the HF-CPUs with
a service life of 20 years and with a repair time of 100 hours:
Operation in low demand mode
low demand mode
According to IEC 61508:2010:
PFDavg = Average probability of dangerous
failure on demand
< 2E-05
15.5 Information on insulation tests, protection class, degree of
protection and rated voltage
Insulation
The insulation is designed in accordance with the requirements of IEC 61010-2-201.
NOTE
For modules with 24 V DC (SELV/PELV) supply voltage, electrical isolation is tested with
707 V DC (type test).
Pollution degree/overvoltage category in accordance with IEC 61131-2, IEC 61010-2-201
• Pollution degree 2
• Overvoltage category: II
Protection class according to IEC 61131-2, IEC 61010-2-201
The S7-1500R/H redundant system meets protection class I requirements and parts of
protection classes II and III.
Degree of protection IP20
Degree of protection IP20 in accordance with IEC 60529 for all modules of the S7-1500R/H
redundant system:
• Protection against contact with standard test fingers
• Protection against foreign objects with diameters in excess of 12.5 mm
• No protection against water
364
Operation in high demand or continuous mode
high demand/continuous mode
According to IEC 61508:2010:
PFH = Average frequency of a dangerous
-1
failure [h ]
< 1E-09
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD