Siemens SIMATIC S7 Functional Safety Manual

Technical specifications
A.1 General technical specifications
S7-1200 Functional Safety Manual
136 Manual, 02/2015, A5E03470344-AA
A.1.7
Surge immunity
Wiring systems subject to surges from lightning strike coupling must be equipped with
external protection. One specification for evaluation of protection from lightning type surges
is found in EN 61000-4-5, with operational limits established by EN 61000-6-2. S7-1200 DC
CPUs and signal modules require external protection to maintain safe operation when
subject to surge voltages defined by this standard.
Listed below are some devices that support the needed surge immunity protection. These
devices only provide the protection if they are properly installed according to the
manufacturer's recommendations. Devices manufactured by other vendors with the same or
better specifications can also be used:
Table A- 3 Devices that support surge immunity protection
Sub-system
Protection device
+24 VDC power
BLITZDUCTOR VT, BVT AVD 24, Part Number 918 422
Industrial Ethernet DEHNpatch DPA M CLE RJ45B 48, Part Number 929 121
+24 VDC digital inputs
DEHN, Inc., Type DCO SD2 E 24, Part Number 917 988
+24 VDC digital outputs and
sensor supply
DEHN, Inc., Type DCO SD2 E 24, Part Number 917 988
Analog IO
DEHN, Inc., Type DCO SD2 E 12, Part Number 917 987
Relay outputs
None required
Table A- 4 Conducted and radiated emissions per EN 61000-6-4
Electromagnetic compatibility - Conducted and radiated emissions per EN 61000-6-4
Conducted Emissions
EN 55011, Class A, Group 1
0.15 MHz to 0.5 MHz
< 79dB (μV) quasi-peak; <66 dB (μV) average
0.5 MHz to 5 MHz
< 73dB (μV) quasi-peak; <60 dB (μV) average
5 MHz to 30 MHz
< 73dB (μV) quasi-peak; <60 dB (μV) average
Radiated Emissions
EN 55011, Class A, Group 1
30 MHz to 230 MHz
< 40dB (μV/m) quasi-peak; measured at 10 m
230 MHz to 1 GHz
< 47dB (μV/m) quasi-peak; measured at 10 m
1 GHz to 3 GHz
< 76dB (uV/m) quasi peak, measured at 10 m

Siemens SIMATIC S7 Specifications

General

Brand	Siemens
Model	SIMATIC S7
Category	Controller
Language	English