Communication with the S7-300
5.4 S7 communication structure
Communication service Distribution
Routing PG functions The CPU provides a certain number of connection resources
for routing.
These connections are available in addition to the S7
connection resources.
The number of routing connections can be found in the
Technical Specifications.
Global data communication
Point-to-point connection
These communication services do not use S7 connections.
Availability of the S7 connections
The following table shows the available S7 connections.
Table 5-6 Availability of the S7 connections for the CPU 315T-2 DP
Reserved for
CPU Total number
of
S7
connections
PG
communication
OP
communication
S7 basic
communicatio
n
Free
S7 connections
315T-2 DP 16 1 to 15, default 1 1 to 15, default 1 0 to 12,
default 0
Displays all non-reserved S7
connections as free connections.
Example of a CPU 315T-2 DP
The CPU 315T-2 DP provides 16 S7 connections:
• Reserve two S7 connections for PG communication.
• Reserve three S7 connections for OP communication.
• Reserve one S7 connection for S7 basic communication.
This leaves 10 S7 connections available for arbitrary communication services, e.g. S7
communication, OP communication, etc.
Reference
Further information
• on SFCs can be found in the
Instruction list
, for more details refer to the
STEP 7 online
help
or to the
System and Standard Functions
reference manual.
• on communication can be found in the
Communication with SIMATIC
manual.
S7-300 CPU Data: CPU 315T-2 DP
Manual, 12/2005, A5E00427933-02
5-17
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