Fault-Tolerant Foundation Fieldbus - Siemens SIMATIC PCS 7 Function Manual

Fault-tolerant Solutions in PCS 7
3.3 Solutions for communication
● If you use a SIMATIC AFDiS as a field barrier between the FF Link and the field devices,
you can connect the field devices in hazardous areas of zones 0 or 1. The outputs of the
SIMATIC AFDiS fulfill the requirements for types of protection EEx(ia) and EEx(ib).
● The number of devices is limited by the current.
Additional information
● Documentation
● Documentation
● Operating instructions
3.3.5.7

Fault-tolerant FOUNDATION Fieldbus

Functionality
PCS 7 enables the connection of field devices to the FOUNDATION Fieldbus H1 (referred to
only as FOUNDATION Fieldbus or FF from this point). A fault-tolerant FOUNDATION Fieldbus
is connected to the redundantly configured FF Link . If the transmission path fails, the
communication path of the FOUNDATION Fieldbus is preserved as far as the spur line to the
field devices.
Fault-tolerant communication solutions
The following communication solutions are offered to prevent a possible failure:
● Ring redundancy with the AFD (Active Field Distributor)
● Coupler redundancy with the AFS (Active Field Splitter)
Connection of the fault-tolerant FOUNDATION Fieldbus to PROFIBUS DP
You can connect a fault-tolerant FOUNDATION Fieldbus to the PROFIBUS DP . The following
variants can be realized:
● Connection to a redundant PROFIBUS DP
Connecting a fault-tolerant FOUNDATION Fieldbus via redundant FF Link
(2x IM 153-2 FF, 2 x FDC 157)
● Connection to a singular PROFIBUS DP
Connecting a fault-tolerant FOUNDATION Fieldbus via FF Link with redundant coupler pair
(1x IM 153-2 FF, 2 x FDC 157)
We recommend the following configuration limits in PCS 7 when connecting FF devices using
AFD or AFS :
● You can connect one FF segment to the FF Link .
● For the purpose of increasing availability when using ring redundancy (fault-tolerant
connection), connect a maximum of 4 field devices (one field device per spur line) to an
active field distributor AFD(maximum of FDC 157 8 AFD to a redundant coupler).
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SIMATIC; Process Control System PCS 7; PCS 7 Readme
SIMATIC; PCS 7 process control system; PCS 7 - FOUNDATION Fieldbus
SIMATIC; Bus links; FF Link bus link
Fault-tolerant Process Control Systems (V8.1)
Function Manual, 11/2014, A5E34878832-AA