Siemens SIMATIC NET CP 343-1 Uživatelský manuál stáhnout pdf (Strana 30)

5 Performance Data / Operation

B−30

CP 343-1 Advancedfor Industrial Ethernet / Manual Part B

Release 06/2008

C79000-G8976-C202-04

5.3 Characteristics of the SEND/RECEIVE interface

The SEND/RECEIVE interface provides access to communication over TCP,

ISO-on-TCP, ISO transport, E-mail, and UDP connections.

The following characteristics are important:

Table 5-4

Characteristic Explanation / values

Number of ISO transport connections +

ISO-on-TCP connections + TCP connections +

UDP connections + E-Mail connections in total

Maximum 16

Notes:

S All UDP connections are also possible in the

multicast mode

S Free UDP connections are supported by the

CP.

S E-mail connection: 1

Max. data length for blocks AG_SEND (V4.0 and

higher) and AG_RECV (V4.0 and higher)

AG_SEND and AG_RECV allow the transfer of

data fields of between 1 and 240 bytes.

S 1 to 8192 bytes for ISO transport,

ISO-on-TCP, TCP, E-mail;

S 1 to 2048 bytes for UDP

Restrictions for UDP

S Transfer is not confirmed The transmission of UDP frames is unconfirmed, in

other words the loss of messages is not detected

or displayed by the send blocks (AG_SEND).

S No reception of UDP broadcast To avoid communication overload resulting from a

high broadcast load, the CP does not permit

reception of UDP broadcast.

S 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

To calculate the CPU cycle times (OB1) with SEND/RECEIVE connections, the

execution time for the FCs (FC AG_SEND, FC AG_RECV) required for processing

on the S7-300 / C7-300 CPU is the decisive factor.

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 79 80

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