Siemens SIMATIC NET S7-400 Manual page 20

Performance data
2.3 SEND/RECEIVE interface
Limitation by the CPU
In productive operation, the number of SEND/RECEIVE calls that can be used at one time
depends on the CPU resources being used. Note the information on the available CPU
resources in section System environment (Page 23).
The following CPU resources are required:
● Per SEND job short (AG_SEND) or long (AG_LSEND): 1 resource
● Per RECEIVE job short (AG_RECV): 1 resource
● Per RECEIVE job long (AG_LRECV): 2 resources
● Per SPEED SEND/RECV job (AG_SSEND, AG_SRECV): 0 resources
Limitation by the CP
A maximum of 64 SEND/RECEIVE connections can be operated by the CP.
At an assignment of 1 CP per CPU, the maximum number of SEND/RECEIVE calls that can
be used at one time is limited as follows:
● SEND calls short (AG_SEND) or long (AG_LSEND): max. 32
● RECEIVE calls short (AG_RECV): max. 64
● RECEIVE calls long (AG_LRECV): variable
*)
**)
***)
on the number of SEND calls active at the same time (see tables below).
Table 2- 1 Dependency of the maximum number of RECEIVE calls long (AG_LRECV FC60) used at the same time on
the number of SEND calls (CPU 412/414)
Number of simultaneous
SEND calls
Max. number of simultane-
ous FC60s per CPU 412/414
20
The higher values apply to the CPU 416 and CPU 417.
The lower values apply to the CPU 412 and CPU 414.
The number of AG_LRECV program blocks that can be used at the same time depends
0 1 2
19 18 17
/ 24 per CPU
*) **)
***)
3, 5 6
4
16 15 14
/ 12 per CPU
*) **)
7 8, 10
9
13 12 11
Manual, 03/2019, C79000-G8976-C299-04
11 12
10 9
CP 443-1 RNA