Siemens SIMATIC NET CP 343-1 Manual de usuario descargar pdf (Pagina 18)

Performance data

2.5 PROFINET IO characteristic data

CP 343-1

18 Manual, 10/2012, C79000−G8976−C201-07

Characteristic Explanation / values

 Transfer is not confirmed

The transfer of UDP frames is unconfirmed, in

other words the loss of messages is not detected

or displayed by the send block (AG_SEND).

 No receipt of UDP broadcast

To avoid communications overload of the CP due

to high broadcast load, the CP does not allow

receipt of UDP broadcasts.

 UDP frame buffering

Size of the frame buffer with buffering enabled: 2

Kbytes

Note:

Following a buffer overflow, newly arriving frames

are discarded.

Execution times of the FCs AG_SEND / AG_RECV

The execution time required to process the FC blocks (AG_SEND, AG_RECV) required on

the S7-300 / C7-300 CPU is decisive for the calculation of the CPU cycle times (OB1) for

SEND/RECEIVE connections.

Note

Measurements of transmission and reaction times in Ethernet, PROFIBUS and PROFINET

networks for a series of configurations can be found on the Internet at the following address:

25209605 (http://support.automation.siemens.

com/WW/view/en/25209605)

2.5 PROFINET IO characteristic data

Possible modes with PROFINET IO

In PROFINET IO, the CP can operate as a PROFINET IO device or as a PROFINET IO

controller.

Configuration limits of the CP as a PROFINET IO controller

The CP supports the following maximum configuration as a PROFINET IO controller:

Table 2- 5 Configuration limits of the CP as a PROFINET IO controller

Characteristic Explanation / values

Number of operable PROFINET IO devices 32 *), **)

Size of the input area over all PROFINET IO devices ***) 1024 bytes max.

Size of the output area over all PROFINET IO devices 1024 bytes max.

Size of the IO data area per submodule of a module in an IO

device

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 75 76

Sin comentarios

Siemens SIMATIC NET CP 343-1 Manual de usuario Pagina 18