Versions
You can connect one FF segment to the PROFIBUS DP for each bus link. The following
variants can be realized:
● Connection to a singular PROFIBUS DP
– Connection via Compact FF Link (1 x Compact FF Link)
– Connection of a redundant FF segment:
You can find additional information on this in the "Configuring a bus link for FF and
compact FF segment (Page 148)" section.
● Connection to a redundant PROFIBUS DP
– Connection of a singular FOUNDATION Fieldbus via Compact FF Link to a redundant
interface (2 x IM 153-2 FF und 1 x FDC 157)
– Connection of a redundant FF segment:
You can find additional information on this in section "High availability FOUNDATION
Fieldbus (Page 90)".
Physical bus characteristics
● The application protocols for PROFIBUS DP and FOUNDATION Fieldbus are determined
according to IEC 61158-2.
– You can set the transmission speed on the PROFIBUS DP. The maximum transmission
rate is 12 Mbps.
– The transmission speed on the FOUNDATION Fieldbus is 31.25 Kbps. The transmission
method is determined by IEC 61158‑2 .
● Depending on the power consumption of the FF devices, up to 31 FF devices can be
connected to the FOUNDATION Fieldbus .
Use in hazardous areas
● The intrinsically safe PROFIBUS DP is specified for the type of protection EEx(ib) .
● When the bus link is built into an enclosure conforming to at least an IP 54 degree of
protection, the bus link can be installed in operating environments up to Ex Zone 2.
● If you use a SIMATIC AFDiS as a field barrier between the bus 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
SIMATIC; Process Control System PCS 7; PCS 7 Readme
● Documentation
SIMATIC; PCS 7 process control system; PCS 7 - FOUNDATION Fieldbus
● Operating Instructions
SIMATIC; Bus Link; Compact FF Link
High availability solutions in PCS 7
4.3 Solutions for communication
High Availability Process Control Systems (V9.0)
Function Manual, 05/2017, A5E39221836-AA 89
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