Data Of Fms Connections - Siemens CP 443-5 Basic Manual

Performance Data
5.3

Data of FMS Connections

The following information is important for operating FMS connections:
Table 5-3
Component
Maximum number of operable FMS connections
User data length
Configurable Variables
Cycle Load Caused by FMS Connections
When calculating the reaction times with FMS connections, the run time of the
function blocks (FBs) in the S7-400 CPU (416-1 see Table 5-4) is the decisive
factor.
The table below shows the cycle load resulting from the available FCs in ms. A
distinction is made between the statuses "job completed" and "job active".
Table 5-4
Status
Component / FB
READ 1.2 ms
WRITE 1.2 ms
STATUS 1.0 ms
REPORT 1.7 ms
IDENTIFY 1.7 ms
B3–14
www.gkbpx.com
The value depends on how many CPUs there are
in the S7 station FMS connection endpoint:
S
1 CPU:
S
2 CPUs:
S
4 CPUs:
Note:
These restrictions are not checked when you
configure connections in STEP 7.
237 bytes for READ
233 bytes for WRITE and REPORT
512 server variables and 2640 variable
descriptions that can be loaded from the partner.
These can be distributed as required on the
maximum number of configurable FMS
connections. The value applies to elementary data
types or arrays of elementary data types.
This value does not apply to complex data types
(STRUCT)! Note the information in the manual /2/
about using complex data types (STRUCT).
Job Completed
min max
1.6 ms
1.6 ms
1.5 ms
3.1 ms
3.1 ms
CP 443-5 Basic for PROFIBUS / Manual Part B3 –
Explanation / Values
48
42
32
Job Active
min max
1.0 ms 2.3 ms
1.0 ms 2.7 ms
1.0 ms 2.8 ms
1.3 ms 4.8 ms
1.3 ms 4.8 ms
Release 11/2002
C79000-G8976-C161-03
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