Characteristic Data Of Open Communications Services (Send/Receive Interface) Over Fdl Connections; Characteristics Of S7 Communication - Siemens SIMATIC NET CP 443-5 Extended Manual

1.4.3 Characteristic data of open communications services (SEND/RECEIVE
interface) over FDL connections
General characteristic data
The characteristic data is important when operating FDL connections (specified, free layer 2
(SDA and SDN), broadcast, multicast):
Table 1- 5 General characteristic data of open communications services
Characteristic
Total number of FDL connections that can
be operated.
Size of the transferable data area on FDL
connections.
Cycle load time due to FDL connections
The calculation of the cycle load time for FDL connections is largely dependent on the time
required to execute the program blocks (AG_SEND, AG_RECV) on the S7400 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 1-1 Use with the current
CPU types (Page 13)).
Table 1- 6
Job status
Component / FC
AG_SEND
AG_RECV
1.4.4

Characteristics of S7 communication

General characteristic data
The following information is important when operating S7 connections:
Table 1- 7
Characteristic
Number of S7 connections that can
be operated via PROFIBUS
CP 443-5 Extended
Manual, 11/2018, C79000-G8976-C162-09
Explanation / values
32 max.
1-240 bytes max. per specified FDL connection (for sending and receiving)
Free Layer 2, broadcast and multicast:
Up to 236 bytes of user data can be transferred per job. The job header
occupies an additional 4 bytes.
Cycle load time
Job completed
min.
0.10 ms
0.13 ms
General characteristics of S7 connections
max.
0.11 ms
0.14 ms
Explanation / values
48 max.
(The value depends on the S7400 CPU being used.)
Application and functions
1.4 Performance data
Job active
min. max.
0.14 ms 0.16 ms
0.12 ms 0.13 ms
19