Siemens SIMATIC NET Provozní pokyny Strana 173

  • Stažení
  • Přidat do mých příruček
  • Tisk
  • Strana
    / 338
  • Tabulka s obsahem
  • ŘEŠENÍ PROBLÉMŮ
  • KNIHY
  • Hodnocené. / 5. Na základě hodnocení zákazníků
Zobrazit stránku 172
Guidelines for Installing Networked Automation Systems in Buildings
7-25
SIMATIC NET Twisted-Pair and Fiber-Optic Networks
C79000-G8976-C125-02
7.6 Electromagnetic Compatibility of Fiber-Optic Cables
Fiber-Optic Cables
For communications 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 EMI
levels. Remember, however, that bus components operating on an electrical basis
such as OLMs, OSMs/ORMs etc. may require additional noise protection
measures if they are being operated in such areas. These must be protected using
the measures already mentioned such as shielding, grounding, minimum
clearance to sources of interference etc.
Zobrazit stránku 172
1 2 ... 168 169 170 171 172 173 174 175 176 177 178 ... 337 338

Komentáře k této Příručce

Žádné komentáře