Siemens S5-135U/155U - Manual (Page 28)

3-2
System Manual
C79000-G8576-C199-06
3.1 Principles of Installation of Systems for EMC
Electromagnetic compatibility (EMC) is understood to mean the capability of
electrical equipment to operate correctly in a defined electromagnetic
environment, without being affected by the environment and without
affecting the environment to an unacceptable degree.
All SIMATIC S5 products have been developed for applications in harsh
industrial environments and meet high requirements for EMC. Before
installing the control system, however, you should still carry out EMC
planning and involve possible interference sources in the assessment.
Described in the following chapter are
S
the various paths over which interference can be picked up in the PLC,
S
typical interference sources and their coupling mechanisms,
S
basic rules for ensuring EMC.
3.1.1 Overview of Possible Types of Interference
Electromagnetic interference can be picked up over different paths by the
programmable controller:
SINEC Bus System
Power Supply
Protective Conductor
I/O Signal Lines
Fields
Programmable
Controller
Figure 3-1 Electromagnetic Interference with Programmable Controllers
What Does EMC
Mean?
Installation Guidelines