A&D OP-11 Manuale di Installazione Pagina 119

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07/2011 2 Operating A&D DataManagement
2.6 Transferring data
© Siemens AG 2011 All Rights Reserved
SIMATIC A&D DataManagement Client - 07/2011
2-119
2.6.3 Cable connections for the transfer
Basics
ADDM combines various products for data backup and data management. For
which ADDM uses the data transfer mechanisms already implemented in the
products or systems. Therefore, although the user interface for data transfer in
ADDM is always the same, the cable connections to the individual products are
quite different. The various cable connections, which may occur when using
ADDM, are described in the following.
Which cable connection is required?
The cable connections required depend upon the component to be backed up. The
cable to be used to connect the component can be found in either the properties of
the component concerned or in the section "How does A&D DataManagement
work?".
This section also provides information about the characteristics of the cable
connections and the options, which the various cable connections offer.
MPI, OPI, PROFIBUS
All SIMATIC-S7 controls and their special versions, which also include the
SINUMERIK 840D and the MCU 172A, are addressed directly over the MPI
interface.
This interface is physically a PROFIBUS interface, but with a defined number of
nodes and a fixed data transfer speed of 187.5 kbaud.
The OPI is also used with SINUMERIK controls. This interface is, like the MPI
interface, a PROFIBUS interface, but with a 1.5 Mbaud data transfer rate. Some
CPUs have PROFIBUS interfaces onboard as well as the MPI interface, or
PROFIBUS CPs can be plugged in. In such cases, the CPU is accessible both via
MPI/OPI as well as via PROFIBUS.
An appropriate interface card and a matching MPI cable are required for coupling
the backup computer in all cases. A connection to the components, which the MPI,
OPI or PROFIBUS require, is impossible without this hardware.
V24 COM1/2 ports
The RS-232-C ports are very frequently used communication interfaces in the PC
world. As a rule, these ports are present on every PC and are named COM1 or
COM2. There is an interface component located behind which can transfer a byte
of the PC serially via a cable to a second COM port. This means that the bits are
transferred one after the other (serially). The COM ports are synchronized by a
leading start bit and by one or more following stop bits.
As the data transfer is defined via voltage levels, the distance between the devices
must not be too great, or a suitably low data transfer rate must be selected.
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