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Description:
SIMATIC S7 provides diverse communication services and connections.
Here we present a selection of options for data exchange between CPUs (S7-300, S7-400). The select does not include all conceivable possibilities.
Usually the MPI/PROFIBUS DP interface is used for CPU-CPU communication.
Please also note the different data and consistency areas in the individual CPUs and services.
1. MPI interface and communication services
| Communication services |
Further information and notes |
| Global data |
SFC manual 1) Chapter 19;
FAQ 430498 with detailed instructions. |
| S7 basic communication with X_PUT, X_GET |
SFC manual, sections 22.5 and 22.6 |
1) SFC manual is used in the FAQ as an abbreviation for the manual "System Software for S7-300/400 System and Standard Functions" that is available in Entry ID: 1214574 .
An overview of the communication options via MPI is available in Entry ID: 21537047. A detailed explanation is available in the SFC manual, chapters 19 - 22.
2. PROFIBUS DP interface and communication services
| Type of connection |
Further information and notes |
| Master/Master |
DP-DP coupler links two networks;
manual in Entry ID: 1179382 |
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CPUs connected via CP 342-5;
application in Entry ID: 20987807 |
| Master/Slave |
S7 basic communication with X_PUT, X_GET:
SFC manual, sections 22.8 and 22.9; application in Entry ID: 20987910
Master and slave must be in the same project, one CPU is I slave. |
| Slave/Slave (internode communication) |
FAQ with Entry ID: 1016961 |
Further information and notes
- A systematic overview of all communication with SIMATIC S7 is available in Entry ID: 20982954 and in the manual "Communication with SIMATIC" in Entry ID: 1254686.
- Additional communication services are available in the SFB manual in the chapters on communication.
- Connection between S7-300/400 and S7-200 is described in the FAQ in Entry ID: 747743 .
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