Siemens SIMATIC S7-300 Module data Hardware And Installation Manual

Appendix
S7-300 Programmable Controller Hardware and Installation
A5E00105492-01
11-13
Figure 11-4 Mounting cable shielding
11.2.6 Equipotential bonding
Potential differences
Potential differences can occur between separate system elements. This can result
in high equipotential currents, e.g. if the cable shielding is terminated at both ends
and grounded to different system components.
The cause of potential difference can be differences in the power supplies.
Warning
Cable shielding is not suitable for equipotential bonding. Always use the prescribed
cables (e.g. with a cross-section of 16mm
2
). When installing MPI/DP networks,
provide a sufficient conductor cross-section. Otherwise, interface hardware might
get damaged or even be destroyed.
Equipotential conductor
To reduce potential differences and ensure proper functioning of your electronic
equipment, you must install equipotential conductors.
Note the following points on the use of equipotential conductors:

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)