Siemens CP 343-1 manual Performance Data, Characteristics of S7 Communication

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1.2Performance Data

1.2.1Characteristics of S7 Communication

The functions and characteristics of S7 communication are described in /8/ and /11/.

1.2.2Characteristics of ISO Transport Connections

The following information is important for operating ISO transport connections (SEND/RECEIVE interface):

Table 4

Characteristic

Explanation / Values

Total number of connections on Industrial Ethernet

32 maximum

Number of connections for S7 communication on Industrial Ethernet

The actual value depends on the CPU type being used. Please refer to /1/ for the values for your CPU.

Number of ISO transport connections

Maximum data length for AG_SEND and AG_RECV blocks

Maximum data length for AG_LSEND and AG_LRECV blocks

16 maximum

AG_SEND and AG_RECV allow the transfer of data fields of between 1 and 240 bytes.

AG_LSEND and AG_LRECV are shipped for the CP 343–1 from version 5 or higher (firmware V3.00) and permit the transfer of data fields of between 1 and 8192 bytes (for more detailed information, see Table 3 ).

Reaction Times of ISO Transport Connections

The calculation of the reaction times with ISO transport connections is deter- mined by the run time of the function blocks required on the S7-300 CPU (AG-SEND, AG–RECV).

Product information CP 343–1	7
C79000–Z8964–C038–05