Siemens SIMATIC S7-300 Module data Hardware And Installation Manual

Appendix
S7-300 Programmable Controller Hardware and Installation
A5E00105492-01
11-3
11.2 protection against electromagnetic interference
11.2.1 Basic points for system installations conforming with EMC
requirements
Definition: EMC
EMC (electromagnetic compatibility) describes the capability of electrical
equipment to operate free of errors in a given electromagnetic environment, without
being subject to external influence and without influencing external devices in any
way.
Introduction
Although your S7-300 and its components are developed for an industrial
environment and high electromagnetic compatibility, you should draw up an EMC
installation plan before you install the controller under consideration of all possible
interference sources.
Possible effects of interference
Electromagnetic noise can influence a PLC in various ways:
• Electromagnetic fields having a direct influence on the system
• Interference via bus signals (PROFIBUS-DP etc.)
• Interference coupling via the system wiring
• Interference influencing the system via the power supply and/or protective
ground
The figure below shows the likely paths of electromagnetic interference.
electromagnetic
fields
power supply module
protective earth
bus signal
process wiring
SF
BUSF
DC5V
FRCE
RUN
STOP
SIEMENS
Figure 11-1 Possible paths of electromagnetic interference

Siemens SIMATIC S7-300 Module data Specifications

General

Series	S7-300
Manufacturer	Siemens
Protection Class	IP20
System	SIMATIC S7-300
Digital Inputs	Varies by module
Digital Outputs	Varies by module
Analog Inputs	Varies by module
Analog Outputs	Varies by module
Central Processing Unit	Varies by CPU model
Supply Voltage	24V DC or 120/230V AC
CPU Type	Varies (e.g., CPU 312, CPU 315, etc.)
Memory	Varies by CPU model
Communication Interfaces	MPI, PROFIBUS
Programming Languages	LAD, FBD, STL, SCL, GRAPH
Operating Temperature	0°C to 60°C
Storage Temperature	-40°C to 70°C
Relative Humidity	10% to 95% (non-condensing)