Technical data

Editing Projects with Different Versions of STEP 7
7.3 Editing Current Configurations with Previous Versions of STEP 7
Programming with STEP 7
Manual, 05/2010, A5E02789666-01 187
7.3 Editing Current Configurations with Previous Versions of STEP 7
Configuring Direct Data Exchange (Lateral Communication)
Configuring direct data exchange with a DP master without a DP master system:
• Not possible with STEP 7 V5.0, Service Pack 2 (or older version)
• Possible with STEP 7 V5.0, as of Service Pack 3 and as of STEP 7 V5.1
If you save a DP master without its own DP master system with configured assignments for direct
data exchange and you continue to edit this project with an older version of STEP 7 V5 (STEP 7
V5.0, Service Pack 2 (or older)), the following effects can occur:
• A DP master system is displayed with slaves that are used for a STEP 7-internal data storage
area of the assignments for direct data exchange. These DP slaves do not belong to the
displayed DP master system.
• You cannot connect a new or an orphaned DP master system to this DP master.
Online Connection to the CPU by Means of a PROFIBUS-DP Interface
Configuring the PROFIBUS-DP interface without a DP master system:
• STEP 7 V5.0, Service Pack 2 (or older): a connection to the CPU by means of this interface is
not possible.
• As of STEP 7 V5.0, Service Pack 3: During compilation, system data for the PROFIBUS-DP
interface are generated; a connection to the CPU by means of this interface is possible after
downloading.