Definitions - Siemens SITRANS F Series Function Manual

Definitions

Acyclic Data – data read over the acyclic communication channel, and this data could take
several bus scans to be read. The total amount of time that this process takes is random and
therefore acyclic.
Baud Rate – the speed of the network in bits per second.
Class 1 Master – a type of device on a PROFIBUS network and the traditional master in process
control systems. Refers to a Distributed Control System (DCS) or Programmable Logic
Controller (PLC).
Class 2 Master – a type of device on a PROFIBUS network and the traditional engineering
work station. An example of a class 2 master is SIMATIC PDM.
Cyclic Data – data that is read in every bus scan. It's the input and output data used for control
and is time sensitive.
Deterministic – the knowledge that something is going to occur with a fixed time period. This
is a requirement of advanced control systems.
EDD – the Electronic Device Description is a collection of text files describing all the acyclic
data in a field device and how to read and write them. EDDs are used by configuration software
such as SIMATIC PDM to configure field instruments.
EDDL – Electronic Device Description Language is the language that EDDs are written in.
EDDL is an international standard defined in IEC 61804-2 and IEC 61804-3.
Ethernet – Ethernet is a type of physical layer defined in the IEEE 802.3 standard used for
communications in a local area network.
FDT – Field Device Tool is standard program interface (software) for configuring field devices.
FDT uses Device Type Managers to program field devices. FDT software is an alternative to
EDD based software such as SIMATIC PDM.
FDI – Field Device Integration is the evolution of FDT and EDD technology. It is for configuration
of field devices and is based on OPC-UA (Object Linking and Embedding for Process Control
– Unified Architecture) and EDD technology.
FF – Foundation Fieldbus is a digital protocol used to configure and troubleshoot field
instruments.
FISCO – Fieldbus Intrinsic Safe Concept. A standard that makes it easy to place FISCO
approved instruments into zone 0 and above environments.
FNICO – Fieldbus Non-Incendive Concept. A similar standard to FISCO. It is makes it easy to
place FISCO approved instruments into zone 2 environments.
Full-duplex – Full-duplex refers to a communication link that is bi-directional allowing for both
devices to talk and listen at the same time.
GSD – General System Data (or Generic Slave Description) is a text file in PROFIBUS and a
XML file in PROFINET defining all the protocol information and cyclic data of a field device. It
is used by the network configuration software to identify the slave and to set up the data
exchanged between the master and the slave during cyclic data exchange. GSD was also
originally the German acronym for Gerätestammdaten.
FCT030 Profibus (From firmware 4.0)
Function Manual, 06/2018, A5E39931906-AB
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