MTL 9312-FB-ST-SS-SP, Инструкция по эксплуатации

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INM9312-FB-ST-SS-1 Oct 2008
9312-FB-ST-SS-SP Fieldbus Barriers INM9312-ST-SS-SP-1
Oct 2008
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1 GENERAL INFORMATION
1.1 Warning information
Warnings are occasionally provided in these operating instructions in the following manner:
They are always identified by the signalling word "
WARNING “ and sometimes also have a symbol
which is specific to the danger involved.
1.2 Symbols used
Action required - recommended user actions
Reaction - the outcome of described actions
Energised parts!
Danger of explosion!
1.3 Definitions of terms
F
OUNDATION
fieldbus TM
Fieldbus protocol defined by the Fieldbus Foundation TM .
H1
The low-speed version of F
OUNDATION
fieldbus TM operating at 31,25kbits/s. H1 fieldbus has been widely
adopted in the process industries and is suitable for use in regulatory control and monitoring applications
in safe and hazardous areas.
Profibus-PA
One of the three vendor-independent fieldbus variants supported by the Profibus organisation.
Profibus-PA is intended for Process Automation and shares the same 31,25kbits/s physical layer
specification as F
OUNDATION
fieldbus TM H1.
Trunk
The main communication cable on a fieldbus segment. It is typically the longest cable path between any
two fieldbus devices.
Terminator
Network of components that are used at each end of a fieldbus segment to match the characteristic
impedance of the cable.
Spur
A branch cable connecting a fieldbus device to the fieldbus trunk. Spurs can be up to 120m in length.
Fieldbus power supply
A power supply that provides DC power onto a fieldbus trunk without interfering with the communications
signals. Combined with the two terminators, it conditions the trunk impedance to be compatible with
fieldbus instruments.
WARNING
The type and source of the danger!
The possible consequences
Ways to avoid the danger
Ex