5
Performance Data
B4 - 19
CP 443-5 Extended for PROFIBUS / Manual Part B4
Release 6/2005
C79000-G8976-C162-06
5.3
Characteristics of S5-compatible Communication
(SEND/RECEIVE Interface) over FDL Connections
The following information is important for operating FDL connections (specified,
free layer 2 (SDA and SDN), broadcast, multicast):
Table 5-2
Characteristic
Explanation / Values
Total number of FDL connections that can be
operated.
32 maximum
Size of the transferable data area on FDL
connections
1 - 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 Time due to 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 (6ES7 417- 4XL04- 0AB0 - see Table
2-1).
Table 5-3
Status
Job Completed
Job Active
Component / FC
min.
max.
min.
max.
AG-SEND
0.10 ms
0.11 ms
0.14 ms
0.16 ms
AG-RECV
0.13 ms
0.14 ms
0.12 ms
0.13 ms
