Siemens SIMATIC NET CP 342-5 Manual page 31

Note the following limits:
Characteristic
Number of operable connections in total:


1) The number of S7 connections that can be operated when using the module as DP master depends
Influence of the data length in S7 communication
In S7 communication, the data length of the jobs and in DP mode, the number of DP slaves
and the length of the I/O data mean the following restrictions:
● Number of S7 connections
● Number of jobs that can be sent at one time
The decisive factor is the job with the highest data length.
The information in the following table applies to S7 job types BSEND/BRCV, PUT/GET, and
USEND/URCV.
Data length in bytes
<=1000
2000
4000
8000
16000
32000
1) A maximum of 32 Kbytes can be transmitted with one BSEND/BRCV block, with
CP 342-5 / CP 342-5 FO
Manual, 10/2011, C79000-G8976-C146-09
in operation with PROFIBUS DP
(DP master with up to 15 DP slave
in operation without PROFIBUS DP
on the number and configuration of the assigned DP slaves (see table below).
Number of S7 connections or number of S7 jobs
1)
S7 communication only
PUT/GET/USEND/URCV a maximum of 160 bytes in each case.
Performance data and behavior in operation
5.7 Parallel use of communications services (multiprotocol mode)
Explanation / values
44 maximum
Of these, up to 16 FDL connections and 12 S7
)
1)
connections and 16 OP connections in multiplex
mode.
48 maximum
With DP master and 32
DP slaves ET200B
(1 byte I data and 1
byte Q data)
16
16
16
8
4
2
With DP master and 32
DP slaves ET200M
(32 byte I data and 32
byte Q data)
10
8
6
4
2
1
8
6
5
4
2
1
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