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Basics of the FOUNDATION Fieldbus
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FOUNDATION Fieldbus (FF) and PROFIBUS PA operate according to IEC 61158-2. The
communication on the fieldbus and the voltage supply of the bus nodes are combined in one
shielded two-wire cable. Up to 32 bus nodes are possible on one FF segment (bus link +
maximum of 31 field devices). Data packets are modulated and transmitted on the supply
voltage for the fieldbus nodes. The transfer rate is 31.25 Kbps.
The most important distinctions between PROFIBUS PA and FOUNDATION Fieldbus
Licensing
● You need the "PDM Foundation Fieldbus" license key to work with SIMATIC PDM.
Operating mode
● PROFIBUS PA devices are operated in master/slave mode.
● FF devices are operated in publisher/subscriber mode.
Connection to PROFIBUS DP
● PROFIBUS PA devices are connected to up to five FDC 157 DP/PA couplers via DP/PA-
Link (redundancy with 2 fieldbus couplers possible).
● FF devices are connected to the automation system via a bus link. The following bus links
are approved for PCS 7:
– FF Link
Configuration with an IM 153-2 FFinterface module and FDC 157 fieldbus coupler
(redundancy with 2 fieldbus couplers possible)
– Compact FF Link
Configuration with Compact FF Link (redundancy with 2 Compact FF Link possible)
Communication with the automation system
● PROFIBUS PA devices only communicate via the automation system. An exception to this
rule is the direct access to a PA device.
● FF devices can communicate on the FF segment without involvement of the automation
system. The name of this function is "Control in the field" (CiF). CiF enables technological
function between FF devices.
Terms used for FOUNDATION Fieldbus (FF)
Publisher and Subscriber
In the time period during which an FF device sends data to the FF, it is referred to as the
Publisher.
FOUNDATION Fieldbus
Commissioning Manual, 02/2015, A5E32711026-AC
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Содержание SIMATIC PCS 7 FOUNDATION Fieldbus
Страница 6: ...Security information FOUNDATION Fieldbus 6 Commissioning Manual 02 2015 A5E32711026 AC ...
Страница 10: ...Introduction FOUNDATION Fieldbus 10 Commissioning Manual 02 2015 A5E32711026 AC ...
Страница 24: ...System planning 4 2 Configuration FOUNDATION Fieldbus 24 Commissioning Manual 02 2015 A5E32711026 AC ...