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Siemens SIMATIC S7-300 Series User Manual

Siemens SIMATIC S7-300 Series
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CPUs
1-15
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
Connection Resources for CPU 318-2
Table 1-8 Communication Resources for CPU 318-2
Communication Function
Description
PD/OP communication 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.
S7 basic communication
When allocating connection resources, you should observe the following
points:
The number of connection resources differs for each interface as
follows:
Routing of PD functions
MPI/DP Interface 32 communication resources
DP-SS: 16 communication resources
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
S7 communication
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.
Principle of Connection Resource Allocation for CPU 318-2
CPU 318-2
MPI/DP
DP
32 connection resources for
connections via the MPI/DP
interface
16 connection resources for
connections via the DP
interface
A total of 32 connection
resources for connections via
the MPI/DP and/or DP
interface
Figure 1-3 Principle of Connection Resource Allocation for CPU 318-2

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Siemens SIMATIC S7-300 Series Specifications

General IconGeneral
Programming LanguagesLAD, FBD, STL, SCL, GRAPH
Operating Temperature0°C to 60°C
Storage Temperature-40°C to 70°C
Protection ClassIP20
ProcessorDepends on CPU model (e.g., CPU 315-2 DP has 16-bit processor)
MemoryDepends on CPU model (e.g., CPU 315-2 DP has 256 KB work memory)
Communication InterfacesMPI, PROFIBUS DP, Ethernet (depending on model)
Power Supply24 V DC or 120/230 V AC (depends on power supply module)
Digital InputsDepends on module (e.g., 8, 16, 32 channels)
Digital OutputsDepends on module (e.g., 8, 16, 32 channels)
Analog InputsDepends on module (e.g., 8, 16 channels)
Analog OutputsDepends on module (e.g., 2, 4)
Relative Humidity5% to 95% non-condensing
MountingDIN rail

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