Siemens SIMATIC NET CP 343-1 Manuel d'utilisateur télécharger pdf (Page 35)

5 Performance Data / Operation

B−35

CP 343-1 Advancedfor Industrial Ethernet / Manual Part B

Release 06/2008

C79000-G8976-C202-04

5.4.4 Effects of multicast communication on RT communication

Notice

If PROFINET IO RT communication is operated at the same time as broadcast

(BC) or multicast (MC) in an Industrial Ethernet subnet, RT frames may be

delayed by long BC frames or MC frames.

These frames can, for example, be generated by the communications FCs

AG_SEND or AG_RECV.

With certain constellations, this can lead to a PROFINET RT communication abort.

The factors that influence this are the switch configurations (“switch depth”), the

update time and the MC/BC frame lengths.

For more detailed information on the influencing factors and possible solutions,

refer to:

http://support.automation.siemens.com/WW/view/en/29104898

5.5 Characteristic data for PROFINET CBA

The CP supports PROFINET CBA interconnections between PROFINET CBA

components.

The “typical” values specified below are values that cause the SIMATIC iMap

configuration tool to generate a warning if they are exceeded; it is nevertheless

possible that the configuration can be operated.

If one of the limit values specified for the interconnections is exceeded, they

cannot be downloaded to the module. When the interconnections are downloaded,

the SIMATIC iMap configuration tool generates an error message to this effect. If a

limit value relating to the number or size of components is exceeded, the CPU will

not change to RUN!

Table 5-9 Characteristic data for PROFINET CBA communication

Characteristic

Typical value Limit value

PROFINET CBA

Number of remote interconnection partners 32 64

Total of all I/Os 600 1000

Data length of all incoming I/Os 2048 bytes 8192 bytes

Data length of all outgoing I/Os 2048 bytes 8192 bytes

Data length for arrays and structures (acyclic

interconnections), maximum

2048 bytes 8192 bytes

Data length for arrays and structures (cyclic

interconnections), maximum

250 bytes 250 bytes

Data length for arrays and structures (local

interconnections), maximum

− 2400 bytes

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 ... 79 80

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