Specifications

CPU Function, depending on CPU and STEP 7 Version
4-5
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
Connection resources
CPU 318-2 CPUs 312IFM to 316-2DP
CPU 318-2 provides a total of 32
communication resources, that is, 32 of
those via MPI/DP interface or 16 via DP
interface.
Those connection resources are freely
available for
 PD/OP communication
 S7 basic communication
 S7 communication and
 Routing of PD communication
The CPUs provide a specific number of
connection resources.
For
 PD communication
 OP communication and
 S7 basic communication
you can reserve connection resources
which can then not be used by any other
communication function.
The remaining connection resources are
then available for PD/OP/S7 basic and S7
communication.
For routing, the CPUs 315-/316-2 provide
additional connection resources for 4
routing connections.