Communication
3.3 S7 connections
CPU 31xC and CPU 31x, Technical Data
3-30 Manual, 01/2006 Edition, A5E00105475-06
See also
Open communication via Industrial Ethernet (Page 3-24)
3.3.3 Distribution and availability of S7 connection resources
Distribution of connection resources
Table 3-10 Distribution of connections
Communication service Distribution
PG communication
OP communication
S7 basic communication
In order to avoid allocation of connection resources being dependent only on
the chronological sequence in which various communication services are
requested, connection resources can be reserved for these services.
For PG and OP communication respectively, at least one connection
resource is reserved by default.
In the table below, and in the technical data of the CPUs, you can find the
configurable S7 connection resources and the default configuration for each
CPU. You "redistribute“ connection resources by setting the relevant CPU
parameters in STEP 7.
S7 communication
Other communication resources (e.g. via
CP 343-1, with a data length of
> 240 bytes)
Available connection resources that are not specially reserved for a service
(PG/OP communication ,
S7 basis communication) are used for this.
Routing PG functions
(only for CPUs with DP/PN interface)
The CPUs provide a certain number of connection resources for routing.
These connections are available in addition to the connection resources.
The subsection below shows the number of connection resources.
Global data communication
Point-to-point communication
This communication service requires no S7 connection resources.
PROFIBUS DP This communication service requires no S7 connection resources.
PROFINET CBA This communication service requires no S7 connection resources.
PROFINET IO This communication service requires no S7 connection resources.
Open communication by means of TCP/IP
Open communication by means of ISO on
TCP
Open communication by means of UDP
This communication service requires no S7 connection resources.
Independently of the S7 connections, a total of 8 own resources are available
for connections or local access points (UDP) for TCP/IP, ISO on TCP, UDP.
SNMP This communication service requires no S7 connection resources.
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