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Definitions
A.1 Definitions
exchanged between the master and the slave during cyclic data exchange. GSD was also
originally the German acronym for Gerätestammdaten.
Gateway – A gateway is a device that joins two different networks together. For example, to
connect a Modbus device to a PROFIBUS network, a Profibus to Modbus gateway is needed.
HART – Highway Addressable Remote Transducer is an industrial protocol used to configure
and troubleshoot field instruments. It is often considered a transition between the 4–20mA
technology and full digital technology since it uses both.
IEC – International Electrical Congress is an international standards organization committed
to creating and maintaining international and open standards for use in the electrical industries.
I/O-Controller – A type of device on a PROFNET network and the traditional master in process
control systems. Refers to a Distributed Control System (DCS) or Programmable Logic
Controller (PLC).
I/O-Device – A type of device on PROFINET that provides input data or realizes output data
into the real world.
I/O-Supervisor – A type of device on a PROFINET network and the traditional engineering
work station. An example is SIMATIC PDM.
ISA – Instrumentation, Systems, and Automation Society is a world wide organization that
develops standards, certifies industry professionals, provides education and training,
publishes books and technical articles, and hosts conferences and exhibitions.
Interchangeability – The ability to switch from one vendor's device to another vendor's similar
device. Interchangeability is a key benefit of PROFIBUS Profile standard.
Intrinsically Safe – An intrinsically safe device keeps the voltage and current low enough so
that it cannot generate a spark of sufficient energy to ignite the gas/particles in the atmosphere
making it safe for use.
Interoperability – The ability to connect different devices from different manufacturers on the
same network and have them work correctly. This is a core strength of PROFIBUS.
Managed Switch – A type of switch that provides additional advanced diagnostics.
Master – A type of device on PROFIBUS that controls communication to slave devices. One
PROFIBUS network can have several Masters on it, and they share communications by using
a token ring protocol.
MBP – Manchester encoded Bus Powered. This is the physical layer defined in IEC-61158-2
that is used for PROFIBUS PA
MBP-IS – This is the same physical layer as MBP, with the addition of power limiters on the
power supply so that the power draws will not exceed those defined for intrinsically safe
operation.
Modem – This is a device that translates a signal from one transmission technology to another.
For example an optical modem converts an electrical signal into light and then back again.
Physical Layer – Refers to medium used to get the ones and zeros from point A to point B.
This layer of the protocol is all about wires and voltage and current levels.
PROFIBUS – Process Fieldbus. Automation communication protocol designed to meet all
industrial and process communication needs.
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FCT030 Modbus (From firmware 4.0)
Function Manual, 06/2018, A5E39931813-AB
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