
Guidelines for Installing Networked Automation Systems in Buildings
7-2
SIMATIC NET Twisted-Pair and Fiber-Optic Networks
C79000-G8976-C125-02
7.1 General Instructions on Networking with Bus Cables
Bus (LAN) Cables in Plants
Bus cables are important connections for communication between individual
components of an automation system. Mechanical damage or repeated electrical
interference affecting these bus connections reduces the transmission capacity of
the system. In extreme cases, such problems can lead to failure of the entire
automation system. This section explains how to protect cables from mechanical
and electrical impairment.
Shielding and Grounding Concept
Bus cables connect programmable controllers. These in turn are connected to
transducers, power supply units, peripheral devices etc. over cables.
All the components together form a complex electrically networked automation
system.
When connecting system components via electrical cables (in this case bus
cables), remember to take into account the requirements of the overall system
structure.
Connecting cables, in particular, influence the shielding and grounding concept.
Shielding and grounding an electrical installation serves the following purposes:
S Protects both humans and animals from dangerous network voltages
S Prevents unacceptable noise emission and susceptibility to noise
S Protects the system from overvoltage (for example lightning protection)
Networking SIMATIC with SIMATIC NET
SIMATIC NET network components and SIMATIC automation components are
designed to operate together taking into account the aspects listed above. By
keeping to the installation instructions described in the system manuals, your
automation system will meet the legal and normal industrial requirements for safety
and noise immunity.
Comentarios a estos manuales