A&D OP-11 Manual de instalación Pagina 160

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2 Operating A&D DataManagement 07/2011
2.10 Standard functions
© Siemens AG 2011 All Rights Reserved
2-160 SIMATIC A&D DataManagement Client - 07/2011
2.10.9 Remote maintenance options
Generales
The components can be accessed via remote management with A&D
DataManagement.
In general, one decides whether the remote maintenance takes place within a
works over the network in the works, or whether it is to be performed from the
outside via telephone or the Internet.
In the case of internal remote maintenance, the accesses are mostly controlled and
clarified by the system administration of the network. In the case of external
accesses, the company must control the releases for whoever would like to
perform the remote maintenance.
Principle
The technical procedure is the same for both types of access. As a rule, software is
used which transmits an image of the user interface of a PGs/PCs to a second
computer. Now, everything that happens on the maintenance PG/PC can be
followed on this second computer. The keyboard signals are also transmitted. This
enables remote control of the maintenance PG/PC.
However, as only the screen contents and keyboard are transmitted, the quantity of
data is limited, and remote maintenance can even be performed over analog
telephone networks.
Fig. 2-6: Remote maintenance (extern)
Standard PC Remote
diagnose software
(viewer)
STEP7 (optional)
ISDN Modem
ISDN router*
Extensive Firewall
mechanisms prevent
unauthorized external
accesses
Ethernet (TCP/IP)
Standard PC
Remote diagnosis (Host)
STEP 7
Telephone
network
ISDN or
analog
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