Technical data

Glossary
PROFIBUS Network Manual
342 System Manual, Edition 04/2009, C79000-G8976-C124-03
Equipotential bonding for lightning protection
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 equipotential bonding conductors, terminals,
connectors, isolating spark gaps, lightning arresters, surge voltage arresters
Fiber-optic cable
A fiber-optic cable is a transmission medium made of optically transparent material (glass
fiber, plastic fiber) for forwarding light signals in the optical network.
FISCO
A model (FISCO - Fieldbus Intrinsically Safe COncept) created by the PTB in cooperation
with well-known manufacturers describing one method of implementing an "i" fieldbus for use
in hazardous areas. This model is characterized by there being only one "active" device, the
bus power supply, connected to the fieldbus. The other devices are all "passive" in terms of
their ability to supply power to the cable. The characteristics of the cables do not influence
the intrinsic safety (within certain limits).
GAP factor
GAP update factor. The gap between the local PROFIBUS address of the master to the next
PROFIBUS address of a master is known as the GAP. The GAP update factor specifies how
many token rotations the master waits before checking whether there is another master in
the GAP.
If the GAP update factor is 3, this means that each master checks whether a new master is
located between its own PROFIBUS address and the PROFIBUS address of the next master
after approximately 3 token rotations.
GroundGround
Ground is the conductive ground area whose potential at any point can be taken as zero.
Chassis ground includes all the interconnected inactive parts of equipment that must not
carry a hazardous voltage even in the event of a fault.
GroundGround
Ground is the conductive ground area whose potential at any point can be taken as zero.
Chassis ground includes all the interconnected inactive parts of equipment that must not
carry a hazardous voltage even in the event of a fault.
Grounding
Grounding involves connecting an electrically conductive part with the ground electrode
through a grounding system.