Knick Stratos PROFIBUS 2222X CondI, Руководство пользователя

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182 Glossary
Conductance
Conductance G [S] = 1 / R [Ω]
Conductivity
Conductivity κ [S/cm] = G [S] · c [1/cm]
Conductivity sensor
Toroidal (electrodeless) sensors can be connected. The cell factor of the sensor in use
must be entered or be determined using a calibration solution taking account of the
temperature. The cell factors for the toroidal sensor models SE 655 (X) and SE 656 (X)
are preset.
FISCO Model (Fieldbus Intrinsically Safe Concept)
Permits connection of several devices to a common bus line and defi nes limit values
for device and cable parameters. This model assumes that only one “active” device,
the bus supply, is connected to the fi eld bus. All other devices are “passive” with
regard to the power supply into the bus. Within the defi ned limits, the line character-
istics have no infl uence on the intrinsic safety.
GSD fi le (device database fi le)
Contains the communication features of slave devices. During commissioning it is
loaded in the process control system.
PROFIBUS-DP (decentralized peripherals)
Standardized specifi cation (EN 50 170) of an open fi eldbus system for binary and
analog signals of sensors and actuators. It has been designed for high-speed data
exchange at the device level.
PROFIBUS-PA (process automation)
Open fi eldbus standard for process automation. It makes use of the transmission
technology to IEC 61158-2 (EN 61158-2) approved for intrinsically safe operation in
hazardous locations, which at the same time allows the fi eld devices to be powered
over the bus.