Definition: EMC
Electromagnetic compatibility (EMC) is the capacity of an electrical installation to function
satisfactorily in its electromagnetic environment without affecting that environment.
Pulse-shaped Interference
The table below shows the electromagnetic compatibility of the described components with
regard to pulse-shaped interference. The prerequisite for this is that the system complies with
the relevant requirements and guidelines relating to electrical equipment.
Pulse-shaped disturbance Tested at Corresponds to severity
Electrostatic discharge according to
IEC 61000‑4‑2
8 kV
6 kV
3 (air discharge)
3 (contact discharge)
Burst pulses (high-speed transient distur‐
bances) according to IEC 61000‑4‑4
2 kV (supply line)
2 kV (signal line)
3
High-energy single pulse (surge) according to
IEC 61000‑4‑5
External protective circuit needed (refer to the Automation System S7-400, Hardware and Installation
(http://support.automation.siemens.com/WW/view/en/1117849) Installation Manual, chapter
Lightning
protection and overvoltage protection
)
It is not necessary to install an external protection circuit for the FF bus.
● Asymmetric interference
2 kV (supply line)
2 kV (signal cable/data line)
3
● Symmetric interference
1 kV (supply line)
1 kV (signal line / data line)
Sinusoidal disturbance
EMC performance of the described components in relation to sinusoidal disturbance variables:
● Disturbance variables according to IEC 61000‑4‑3
HF radiated, electromagnetic HF field, amplitude-modulated
80 to 1000 MHz 1.4 to 2 GHz 2.0 to 2.7 GHz
10 V/m 3 V/m
80% AM (1 kHz)
● Disturbance variables according to IEC 61000‑4‑6
HF coupling
– 10 kHz to 80 MHz
– 10 Veff unmodulated
– 80% AM (1 kHz)
Emission of Radio Interferences
Interference emission of electromagnetic fields according to the standard
EN 61000-6-4 + A1:
Technical data
12.1 General technical data
Compact FF Link
82 Operating Instructions, 03/2015, A5E35651552-AA
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