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DISCOVER May 1/2005
CPUs in teaching and research
A CPU for all Occasions
In France and Germany, CPUs from
the Simatic S7-300 product range
are also gaining in popularity in the
world of higher education. Given
their versatile capabilities, this comes
as no surprise.
 The safety professional:
CPU 315F-2 DP
At the new European
Competence Center for
Safety Technology at
ENSAM University in
Metz, France, Simatic
S7-300F has already become
a fixed variable. At level 3 of the
"Safety Integrated" security concept,
alongside S7-400F, this CPU is realized
as a standard control with integrated
safety function.
If an error occurs, safe Simatic controls
are used to ensure the |
Young engineers using Siemens systems
for safety engineering training at the
European Competence Center |
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application
is flexibly transferred into or kept
in a safe mode. For this purpose, the
fail-safe CPU 315F-2 DP features comprehensive
autonomous testing and
self-diagnosis functions. It also offers
functions such as the processing of
standard and fault-tolerant programs
on one CPU, fail-safe slave-to-slave
communication between intelligent DP
slaves, as well as the usual diagnosis
and alarm functions of the standard
Simatic S7-CPU.
All programming is performed using
step 7 in the standard languages
LAD and FBD. The software package "S7
Distributed Safety" supports the failsafe
I/Os for parameterization and
supports programming with readymade
certified modules.
 Fit for PROFINET: CPU 315-2 PN/DP
A CPU 315-2 PN/DP is currently being
used in the University of Duisburg-Essen
(Germany). Profi-
net is one of the technologies
being studied
as part of an
experiment on "networked"
systems for
control and error diagnosis. The study
is using Profinet communication between
an ET 200 and S7-315 PN.
The CPU enables the connection of
I/O and field devices via Profinet, such
as the distributed I/O Simatic ET 200S
with Profinet interface connection. The
additional integrated Profibus interface
can also be used to connect field
devices as before and the Profinet interface
is then used for communication
at cell level. The Profinet CPU can
be programmed using a central programming
device or PC via Industrial
Ethernet with Step 7. The necessary
driver is included in Step 7. The devices
of the underlying Profibus can
also be accessed from here without the
need to reconnect the programming
device.
The highlights of the CPU include integrated
interfaces, which prevent the
need for additional modules. The CPU
also features continuous communication from control level to field level, an
application option as a gateway from
Profinet/Ethernet to Profibus, and flexible
maintenance using the innovative
Micro Memory Card.
 Scalable for Motion Control: CPU 315T
At the University
of Wuppertal
(Germany), the
automation of a
guideway grinding
machine using
a CPU 317T
is currently the subject of a dissertation
in the faculty of Electronics, Information
and Media Technology.
The CPU 315T combines the Simatic
standard CPU and the high-performance
PLCopen- certified Motion Control
functions: Fast, deterministic controller
cycles enable the high performance
control of up to eight axes – in
isochronous mode. Like the CPU 317T,
the CPU 315T also possesses a fast local
digital I/O device and two Profibus interfaces.
The underlying technology structure
of the control includes 32 technology
objects. These are composed of
a maximum of eight axes, 16 cams, 16
output cams, and eight measuring
probes and external sensors.
A range of features make the CPU interesting
for education: simplified and
fast engineering through the integration
of technology and motion control
in Step 7, easy-to-understand motion
functions based on the international
standard PLCopen, the initial operation
tool "axis control panel" for moving
the axes without the S7 program,
the trace tool for continual recording
or real-time monitoring of target and
actual values, as well as the fast Fourier
transformation for analysis of the frequency
spectrum.
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