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Siemens SIMATIC PCS 7 Function Manual

Siemens SIMATIC PCS 7
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Physical bus characteristics
The application protocols for PROFIBUS DP and PROFIBUS PA are defined according to
IEC 61158-2 and are identical for these two fieldbus variants.
You can set the transmission speed on the PROFIBUS DP. The maximum transmission
speed with the Y-link is 12 Mbps.
The transmission speed on the PROFIBUS PA is 31.25 Kbps.
If the DP/PA coupler is connected directly on PROFIBUS DP, the transfer rate is set to
45.45 Kbps. The DP/PA coupler can be operated with SIMATIC S7 automation systems
and all DP masters that support the transmission rate of 45.45 Kbps.
Depending on the power consumption of the PA devices, up to 31 PA devices can be
connected to the PROFIBUS PA.
Use in hazardous areas
The intrinsically safe PROFIBUS DP is specified for the type of protection EEx(ib).
The following components can be used in operating environments of the Ex zone:
PA Link in Ex version, up to Ex Zone 2
PA Link or FDC 157-0 DP/PA coupler in a housing that meets at least degree of
protection IP54; up to Ex Zone 2
DP/PA coupler Ex [i] cannot be used for redundant configuration (coupler redundancy,
ring); up to Ex Zone 1
If you use a SIMATIC AFDiS as a field barrier between the PA Link or DP/PA coupler and
the field devices, you can connect the field devices in hazardous areas of Zone 0 or Zone
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
Section "Configuring a bus link for PROFIBUS PA (Page 147)"
Section "High availability PROFIBUS PA (Page 83)"
Section "How to configure the redundant PROFIBUS PA (Page 128)"
Operating Instructions
DP/PA coupler, Active Field Distributor, PA Link and Y Link
4.3.5.5 High availability PROFIBUS PA
Functionality
PROFIBUS PA allows the connection of PA devices. A redundant PROFIBUS PA is connected
to FDC 157-0 redundant DP/PA couplers. If the communication path of the PROFIBUS PA
fails, the communication path is preserved as far as the spur line to the field devices.
High availability solutions in PCS 7
4.3 Solutions for communication
High Availability Process Control Systems (V9.0)
Function Manual, 05/2017, A5E39221836-AA 83

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Siemens SIMATIC PCS 7 Specifications

General IconGeneral
BrandSiemens
ModelSIMATIC PCS 7
CategoryControl Systems
LanguageEnglish

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