Siemens SIMATIC NET PROFIBUS Lightning arresters, Lightning protection equipotential bonding

Glossary

IP 65

Degree of protection complying with DIN 40050: complete protection against touch, protection against the penetration of dust and protection against jet water from all directions.

IP 66

Degree of protection complying with DIN 40050: complete protection against touch, protection against penetration of dust and protection against damaging penetration of heavy seas or strong jet water.

IP 67

Degree of protection complying with DIN 40050: complete protection against touch, protection against penetration of dust and protection against damaging penetration of water at a certain pressure during immersion.

ITP

Industrial Twisted Pair; bus system based on the Twisted Pair standards IEEE 802.3i: 10BASE-T and IEEE 802.3j: 100BASE-T for industrial application.

Lightning arresters

are capable of diverting multiple lightning currents or parts of them without any damage occurring.

Lightning protection equipotential bonding

The lightning protection equipotential bonding includes the parts of the indoor lightning protection system required to reduce the potential differences caused by lightning currents, for example, the equipotential bonding bars, the equipoten- tial bonding conductors, terminals, connectors, isolating spark gaps, lightning arresters, surge voltage arresters

Master

When a master is in possession of the token, it can send data to other nodes and request data from other nodes (= active node).

Master-slave technique

Bus access technique in which only one node is the ³ master and all other no- des are ³ slaves.

Max. retry limit

Max. retry limit is a bus parameter and specifies maximum number of call repeti- tions to a DP slave.

PROFIBUS Networks SIMATIC NET	Glossary-3
6GK1970-5CA20-0AA1 Release 2 05/2000