Siemens Simatic S7-400 - Manual (Page 46)

General Technical Specifications
1-18
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
1.5 Information on Insulation Tests, Protection Class and
Degree of Protection
Test Voltages
Insulation resistance was demonstrated in routine testing with the following test
voltages in accordance with IEC 61131-2:
Table 1-16 Test Voltages
Circuits with Rated Voltage U
e
to Other Circuits or
Ground
Test Voltage
0 V < U
e
≤ 50 V 350 V
50 V < U
e
≤ 100 V 700 V
100 V < U
e
≤ 150 V 1300 V
150 V < U
e
≤ 300 V 2200 V
Protection Class
Safety class I to IEC 60536 (VDE 0106, Part 1). In other words, a connection is
required from the protective conductor to the power supply module.
Protection Against Ingress of Foreign Bodies and Water
Degree of protection IP 20 to IEC 60529. In other words, there is protection against
contact with standard probes.
There is no special protection against the ingress of water.