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Properties and functions
1.5 Configuration limits and performance data
1.5.4
Characteristics of S7 communication
S7 communication provides data transfer via the ISO-on-TCP protocol.
Characteristic
Total number of freely usable S7 connections on
Industrial Ethernet
LAN interface - data field length generated by CM
per protocol data unit (PDU = protocol data unit)
Note
Maximum values for an S7-1500 station
Depending on the CPU you are using, there are limit values for the S7-1500 station. Note the
information in the relevant documentation.
1.5.5
PROFINET IO characteristic data
Configuration limits of the CM as an IO controller
The CM supports the following maximum configuration as a PROFINET IO controller:
Characteristic
Number of operable PROFINET IO devices
Size of the input area over all PROFINET IO devices *)
Size of the output area over all PROFINET IO devices
Size of the IO data area per submodule of a module in an IO
device
Size of the consistency area for a submodule
*) The diagnostics addresses of the PROFINET IO devices cannot be used as an input on the IO controller. The data area of
the inputs is reduced by the diagnostics addresses used.
18
Explanation / values
•
for sending: 480 bytes / PDU
•
for receiving: 480 bytes / PDU
Explanation / values
128, of which:
•
Max. 64 IRT devices
Max. 8192 bytes
Max. 8192 bytes
•
Inputs: 256 bytes
•
Outputs: 256 bytes
256 bytes
Operating Instructions, 04/2023, C79000-G8976-C355-05
Max. 64
SIMATIC CM 1542-1
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