2 Characteristics of the Ethernet CPs
A-55
S7-CPs for Industrial Ethernet Configuring and Commissioning
Release 01/2007
C79000-G8976-C182-07
2.5 Slot Rules for SIMATIC S7-400
2.5.1 Permissible Slots
An S7-400 CP can be inserted both in the central rack and in the expansion rack
with a K bus interface. For the total number of CPs you can install, please refer to
the information on the relevant CP in the “Properties” chapter.
In the SIMATIC S7-400, there is no set slot assignment for the SIMATIC NET CPs.
Slots 2 to 18 are permissible. Note, however, that depending on the power supply
module installed, slot 1 may also occupy slots 2-3 (4 during redundant operation).
2.5.2 Number of SIMATIC NET CPs
The number of SIMATIC NET CPs that can be operated simultaneously is limited
by the specific characteristics of the CPU. The exact number can be found in the
CP-specific section of this manual.
2.5.3 Multicomputing
The communication load can be distributed by installing several SIMATIC NET
CPs (distribution of load). If, however, you want to increase the number of
available connection resources, you can insert several CPUs in a rack
(multicomputing). All S7-400 CPUs in a rack can communicate via one or more
SIMATIC NET CPs.
The following communication services support multicomputing:
ISO transport connections
ISO-on-TCP connections
S7 functions
TCP connections
UDP connections
E-mail connections
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