2 Characteristics of the Ethernet CPs
A-56
S7-CPs for Industrial Ethernet Configuring and Commissioning
Release 01/2007
C79000-G8976-C182-07
2.5.4 Removing / Inserting (Replacing Modules)
Removing and inserting the SIMATIC NET CPs for the S7-400 while the power is
on is possible without damaging the modules.
If a CP is replaced with a new CP with the same order number, the configuration
data simply needs to be downloaded again if it is not stored on the CPU (see also
CP-specific sections of this manual).
2.5.5 Note on the S7-400 CPU: Connection Resources
Note that in the S7-400 CPU, one S7 connection is reserved for a PG and a further
one for an OP (HMI = Human Machine Interface).
Attaching the PG over MPI:
To execute ONLINE functions (for example module diagnostics) from a PG on
an S7-400 CP via the MPI interface, two connection resources (addressing of
the interface and the K-bus) are necessary on the S7-400 CPU. These two
connection resources should be taken into account in the number of S7
connections.
Example: The CPU 412-1 has sixteen free resources for S7 functions available.
If a PG is to be used for diagnostics on the S7-400 CP and is connected to the
MPI interface, two connection resources are required on the S7-400 CPU, so
that 14 connection resources remain available.
PG connection via PROFIBUS or Industrial Ethernet
If the PG is connected to the LAN (PROFIBUS or Industrial Ethernet), in order
to execute PG functions on the S7-400 CPU and diagnostics on an S7-400 CP,
only one connection resource on the S7-400 CPU is necessary.
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