Siemens SIMATIC NET CP 343-1 Manuel d'utilisateur télécharger pdf (Page 29)

5 Performance Data / Operation

B−29

CP 343-1 Advancedfor Industrial Ethernet / Manual Part B

Release 06/2008

C79000-G8976-C202-04

5.2 Characteristic data for S7 communication

Table 5-2

Characteristic Explanation / values

Number of connections for S7 communication on

Industrial Ethernet

in each case, up to

S 16 Operator control and monitoring functions

(HMI)

S 16 S7 connections configured at one end

S 16 S7 connections configured at both ends

The number depends on the CPU type being used.

Please refer to /1/ for the values for your CPU.

LAN interface − data field length generated by CP

per protocol data unit

S sending

S receiving

240 bytes / PDU

Execution times of the FBs for S7 connections

To calculate the CPU cycle times (OB1) with S7 connections, the execution time

for the function blocks (FBs PUT, GET, USEND, URCV, BSEND, BRCV) required

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

Table 5-3

Execution time on the CPU per block call

Block type PUT GET USEND URCV BSEND BRCV

Data length <=160 bytes <=16 KB

CPU 314C-2 DP

(6ES7 314-6CF00-0AB0)

<4.9 ms <4.6 ms <4.4 ms <4.8 ms <4.7 ms <4.9 ms

CPU 317-2 PN/DP

(6ES7 317-2EJ10-0AB0)

<1.1 ms <1.4 ms <1.3 ms <1.5 ms <1.4 ms <1.9 ms

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 79 80

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Siemens SIMATIC NET CP 343-1 Manuel d'utilisateur Page 29