Siemens SIMATIC NET PROFIBUS manual Electromagnetic Compatibility of Fiber-Optic Cables

Installing LAN Cables

C.6 Electromagnetic Compatibility of Fiber-Optic Cables

Fiber-Optic Cables

For LAN cables between buildings and/or external facilities, the use of fiber-optic cables is generally recommended. Due to the optical transmission principle, fiber-optic cables are not affected by electromagnetic interference. Measures for equipotential bonding and for overvoltage protection are unnecessary with fiber-optic cables.

Note

Fiber-optic cables are ideally suited for LAN connections in areas with high noise levels.

Remember, however, that the LAN components operating on an electrical basis such as OLMs, OBTs or PLCs with integrated optical interfaces may require additional noise protection measures in such areas before they can be included in the fiber–optic path. These must be protected using the measures already mentioned such as shielding, grounding, greater clearance to sources of interference etc.

C-20	PROFIBUS Networks SIMATIC NET
	6GK1970-5CA20-0AA1 Release 2 05/2000