Siemens SIMATIC NET PROFIBUS manual LAN Cables in Automation Systems

Installing LAN Cables

C.1 LAN Cables in Automation Systems

LAN Cables as Important Plant Connections

In automation systems, the LAN cables are the most important connections between individual plant components. Mechanical damage (cable break) 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.

Keep the Overall System Concept in Mind

LAN cables connect automation systems that in turn are connected to transducers, power supply units, peripheral devices etc. via cables. All the components together form an electrically networked automation system.

When connecting system components via electrical cables (in this case LAN cables), remember to take into account their specific requirements in terms of system structure.

Connecting cables, in particular, affect the concepts

Sfor safe isolation of dangerous power supply voltages

Sfor protecting the system from overvoltage (for example lightning protection)

Sfor EMC (noise emission and noise immunity)

Sfor electrical isolation

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, you will create an automation system that meets the legal and normal industrial requirements for safety and noise immunity.

C-2	PROFIBUS Networks SIMATIC NET
	6GK1970-5CA20-0AA1 Release 2 05/2000