Principle Of Connection Resource Allocation For Cpu; Communication Resources For Cpu - Siemens SIMATIC S7-300 Series Reference Manual

Connection Resources for CPU 318-2
Table 1-8

Communication Resources for CPU 318-2

Communication Function
PD/OP communication
S7 basic communication
Routing of PD functions
S7 communication

Principle of Connection Resource Allocation for CPU 318-2

32 connection resources for
connections via the MPI/DP
interface
Figure 1-3 Principle of Connection Resource Allocation for CPU 318-2
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
The CPU 318-2 provides a total of 32 connection resources (with CPU
as connection terminal point) for these communication functions. Those
32 connection resources can be freely allocated to the various
communication functions.
When allocating connection resources, you should observe the following
points:
S
The number of connection resources differs for each interface as
follows:
– MPI/DP Interface 32 communication resources
– DP-SS: 16 communication resources
S
In the case of connections that do not have the CPU as their terminal
point (e.g. an FM or in the case of routing) you must deduct 2
connection resources from the total resources and 1 connection
resource per interface.
Figure 1-3 shows the principle of allocation of connection resources.
An example of how connection resources are dimensioned is found in
Chapter LEERER MERKER.
A total of 32 connection
CPU 318-2
resources for connections via
the MPI/DP and/or DP
interface
MPI/DP
Description
DP
16 connection resources for
connections via the DP
interface
CPUs
1-15