Siemens S7-400 Installation Manual page 24

Product Overview
Components
PG cables
PROFIBUS components
for example, PROFIBUS bus
terminal
RS 485 repeaters
Programming device (PG) or PC
with the STEP 7 software
package
Fan subassemblies
(for special areas of application)
Additional components of the S7-400 such as communications processors, function
modules, etc., are described in separate manuals.
Components of an M7-400
The most important components of the M7-400 and their functions are given in the
following tables:
Components
Central Processing Units (CPUs)
Accessories:
Memory Card
DRAM Cards
Application Modules (FMs)
Accessories:
Memory Card
DRAM Cards
On-Board Silicon Disk
1-4
Function
...connect a CPU to a
programming device.
... connect the S7-400 to other
S7-400 devices or programming
devices.
...amplify data signals on bus
lines and links bus segments.
...configures, programs, debugs,
and assigns parameters to the
S7-400.
...ventilates modules in special
cases; can be operated with or
without a filter.
Function
... function as AT-compatible
processing units; execute the
user program; communicate via
the MPI with other CPUs or with
a programming device / PC;
serve to accommodate two
interface submodules (IFs).
... are ISA-compatible processing
units to support the CPU.
(They are described in a
separate manual.)
S7-400 and M7-400 Programmable Controllers Hardware and Installation
Illustration
Illustration
A5E00069481-04