Siemens SIMATIC NET CP 343-1 User Manual

B3L−18

CP 343-1 Lean for Industrial Ethernet / Manual Part B3L

Release 03/2007

C79000-G8976-C198-04

Table 5-3

 

Number of  ISO-on-TCP connections + TCP

connections + UDP connections in total

8 maximum
Notes:

S

All UDP connections are also possible in the

multicast mode

S

Free UDP connections are supported by the

CP.

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-on-TCP, TCP;

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

Data field length

The maximum length of the data fields is   2048

bytes.

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.

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.

Table 5-4

 

Execution time on the CPU

315−2 DP

(6ES7 315−2EG10−0AB0)

per AG_SEND block call:

S

<1 ms at <= 240 bytes

per AG_RECV block call:

S

<1 ms at <= 240 bytes

Execution time on the CPU

317−2 PN/DP

(6ES7 317−2EJ10−0AB0)

per AG_SEND block call:

S

<0.8 ms at <= 240 bytes

per AG_RECV block call:

S

<0.8 ms at <= 240 bytes