Profinet Io Characteristic Data - Siemens SIMATIC S7-300 Equipment Manual

Performance data

2.5 PROFINET IO characteristic data

2.5 PROFINET IO characteristic data
Configuration limits of the CP as an IO device and I-device
The CP supports the following maximum configuration if it is configured as a PROFINET IO
device and as an I-device:
Table 2- 4
Characteristic
Maximum number of PROFINET IO connections
Size of the input area of the PROFINET IO device
Size of the output area of the PROFINET IO device
Size of the IO data area per sub module on the
PROFINET IO device
Size of the consistency area for a submodule
Maximum number of submodules
Size of the transfer area
Number of transfer areas
* For the size of the user data, refer to the following section.
Size of the user data
The size of the user data is calculated from the maximum frame size (gross 548 bytes) minus
the following values: 1 for the CP itself, 1 per Interface, 1 per port, 1 for each plugged-in
module in HW Config or per slot used.
Table 2- 5
* By using fewer but larger modules, the amount of user data can be increased.
20
Configuration limits of the CP as a PROFINET IO device
Example of calculating the user data of the CP 343-1 as an IO device
Bytes Explanation
548 Gross size of the frame
-1 for the CP itself
-1 for the Interface
-2 for 2 ports
-32 for the maximum number of pluggable modules
= 512 Net size of the user data *
Value
• As PROFINET IO device:
1 PROFINET connection to a PROFINET IO
controller
or
• As shared device:
2 PROFINET connections to 2 PROFINET IO
controllers
512 bytes max. *
512 bytes max. *
• Inputs: 240 bytes
• Outputs: 240 bytes
240 bytes
32
240 bytes
32
Equipment Manual, 01/2023, C79000−G8976−C198−09
CP 343-1 Lean