Siemens SIMATIC S7-400H System Manual page 90

PROFIBUS DP
7.1 CPU 41x–H as PROFIBUS DP master
What operating modes are there for DPV1 components?
● S7-compatible mode
● DPV1 mode
Compatibility between DPV1 and IEC 61158?
You can continue to use all existing slaves after converting to DPV1. These do not, however,
support the enhanced functions of DPV1.
You can also use DPV1 slaves without a conversion to DPV1. In this case they behave like
conventional slaves. SIEMENS DPV1 slaves can be operated in S7-compatible mode. To
integrate DPV1 slaves from other manufacturers, you need a GSD file complying with
IEC 61158 earlier than revision 3.
Determining the bus topology in a DP master system using SFC 103 "DP_TOPOL"
A diagnostic repeater is available to make it easier to localize disrupted modules or DP cable
breaks when failures occur during operation. This module is a slave that discovers the
topology of a PROFIBUS subnet and detects any problems caused by it.
You can use SFC 103 "DP_TOPOL" to trigger the determination of the bus topology of a DP
master system by the diagnostic repeater. SFC 103 is described in the corresponding online
help and in the
repeater refer to the
6ES7972–0AB00–8BA0.
90
In this mode, the component is compatible with IEC 61158. However, you cannot use the
full DPV1 functionality.
In this mode the component can make full use of DPV1 functionality. Automation
components in the station that do not support DPV1 can be used as before. The DPV1
mode is set by default in SIMATIC.
"System and Standard Functions
"Diagnostic Repeater for PROFIBUS DP
manual. For information on the diagnostic
manual, order number
System Manual, 03/2012, A5E00267695-11
S7-400H