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5 Performance Data

B4A−31

CP 443-1 Advanced for Industrial Ethernet / Manual Part B4A

Release 01/2007

C79000-G8976-C193-06

Table 5-6 Characteristic Data for PROFINET CBA Communication, continued

Characteristic Limit valueTypical valueCharacteristic

with FB90with FB88

Typical value

Access to S7extended variables

Maximum number of S7 connections for

access to variables with the PROFINET

attribute “s7extended”.

Note: The PROFINET attribute

“s7extended” is used only by OPC

applications over the OPC server;

variables with this attribute can only be

used with OPC applications.

(not checked by iMap)

32 maximum

Note: You should also keep in

mind the maximum number of

connections according to Section

7.3

*) The configurable frequency of transmission is directly related to the actual cycle time. For technical reasons,

the cycle time is based on powers of two of the basic cycle time of 1 ms. The actual cycle time therefore

corresponds to the next higher power of two of the configured transfer frequency. This results in the

following ”transfer frequency <−> cycle time” for the specified values:

10<−>8 | 20<−>16 | 50<−>32 | 100<−>64 | 200<−>128 | 500<−>256 | 1000<−>512

**) The value is not checked by iMap.

Note

For information on the data length and data type in PROFINET CBA

communication, refer to the online help on SIMATIC iMap, the “Creating

PROFINET Components” manual and the “Configuring Plants with SIMATIC iMap”

manual.

Notice

With a large configuration or when using other services at the same time (for

example monitoring online), the configured frequency of transmission cannot be

guaranteed in all cases. To remedy this, we recommend that you increase the

frequency of transmission.

Siemens CP 443-1 User Manual

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