Siemens Simatic S7-400

Communication
4.3 S7 connections
S7-400 Automation System, CPU Specifications
Manual, 10/2006, 6ES7498-8AA04-8BA0
4-21
4.3.3 Distribution and availability of S7 connection resources
Distribution of connection resources
Table 4-6 Distribution of connections
Communication service Distribution
Programming device 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 connections (e. g. via
CP)
Available connection resources that are not specially reserved for a service
(PG/OP communication,
S7 basis communication) are used for this.
Routing PG functions
Global data communication
Point-to-point communication
This communication service uses no S7 connection resources.
PROFIBUS DP This communication service uses no S7 connection resources.
PROFINET CBA This communication service uses no S7 connection resources.
PROFINET IO This communication service uses no S7 connection resources.
Open communication by means of TCP/IP This communication service uses S7 connection resources.
Open communication by means of ISO on
TCP
This communication service uses S7 connection resources.
Open communication by means of UDP This communication service uses S7 connection resources.
Web This communication service uses no S7 connection resources.
SNMP This communication service uses no S7 connection resources.
Availability of connection resources
Table 4-7 Availability of connection resources
Reserved for Free
S7 connections
CPU Total number
connection resources
Programming
device
communication
OP
communication
416-3 PN/DP 64 1 1
414-3 PN/DP 32 1 1
Displays all non-reserved S7 connection
resources as free connection resources.