Siemens Simatic S7-400 - Manual (Page 37)

General Technical Specifications
1-9
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
Safety Requirements for Installation
The S7-400/M7-400 programmable controllers are “open type” equipment to the
IEC 61131-2 standard and therefore adhere to the EU directive 73/23/EEC
“Low-Voltage Directive” and are UL/CSA certified as such.
To fulfill requirements for safe operation with regard to mechanical stability, flame
retardance, stability, and shock-hazard protection, the following alternative types of
installation are specified:
• Installation in a suitable cabinet
• Installation in a suitable housing
• Installation in a suitably equipped, enclosed operating area.
1.2 Electromagnetic Compatibility
Introduction
In this section you will find information on the noise immunity of S7-400/M7-400
modules and on radio interference suppression.
All the components of S7-400/M7-400 systems meet the requirements of the
standards that apply in Europe provided they are installed in accordance with all
the appropriate regulations (see Installation Manual, Chapters 2 and 4).
Definition of “EMC”
Electromagnetic compatibility (EMC) is the ability of an electrical installation to
function satisfactorily in its electromagnetic environment without interfering with
that environment.
!
Warning
Personal injury or property damage can result.
Installation of expansions that have not been approved for the S7-400/M7-400 can
result in violations of the requirements and regulations for safety and
electromagnetic compatibility.
Use only expansions that have been approved for the system.