Siemens SIMATIC NET PROFIBUS, Owner'S Manual

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