Performance Data
B3–13
CP 443-5 Basic for PROFIBUS / Manual Part B3 –
Release 11/2002
C79000-G8976-C161-03
Performance Data
5.1
Supported Transmission Rates
The transmission rate is set with the SIMATIC STEP 7 configuration software. For
the permitted rates, refer to Table 7-1 in Chapter 7
5.2
Characteristics of S5-compatible Communication
(SEND/RECEIVE Interface) on FDL Connections
The following characteristics are important when operating FDL connections
(specified, free layer 2 (SDA and SDN), broadcast, multicast):
Table 5-1
Characteristic
Explanation / Values
Total number of FDL connections that can be
operated.
32 maximum
Size of the transferable data area on FDL
connections
240 bytes maximum per specified FDL connection
(for sending and receiving)
Free layer 2, broadcast and multicast:
Per job up to 236 bytes of user data can be
transferred. The job header requires an additional 4
bytes.
Cycle Load Caused by FDL Connections
The cycle load time for FDL connections is largely dependent on the time required
to execute the function blocks (AG-SEND, AG-RECV) on the S7-400 CPU.
The following table lists the cycle load times of the available FCs in milliseconds. A
distinction is made between the statuses “job completed” and ”job active”. The
entries relate to the run time in the CPU 417-4 (see Table 5-2).
Table 5-2
Status
Job Completed
Job Active
Component / FC
min.
max.
min.
max.
AG-SEND
0.12 ms
0.27 ms
0.11 ms
0.29 ms
AG-RECV
0.15 ms
0.37 ms
0.10 ms
0.26 ms
5
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