Technical data

Glossary
Software
452 System Manual, 07/2009, C79000-G8976-C222-07
● There is less load on transmission link, fewer messages are transmitted.
● There is less load on the send buffer of the TIM; an image memory message is entered a
maximum of once in the send buffer.
See also → Image memory / send buffer
IP
Internet Protocol
IP address
An IP address consists of a numeric code made up of four numbers from 0 to 255 (for
example 192.168.0.55). It is the numeric address of a particular computer in the network /
Internet.
ISDN
(Integrated Services Digital Network)
ISDN integrates various services in one transmission network. ISDN networks integrate
telephone, telefax, teletext, Datex-J, video phones and data transfer. This makes a wide
variety of digital services available to the user: Language, texts, graphics and other data.
LAN
(Local Area Network)
Local area network.
Local data traffic is possible in the SINAUT ST7 system via the LAN types "MPI" and
"Industrial Ethernet".
In SINAUT, the LAN is also used as a "WAN", for example when communication via the
Internet is required or when GPRS stations transfer their data onto the Internet to a master
station via a GPRS network.
Local buffer
If the ST7cc server cannot forward its data to WinCC, all messages (ST7 data messages
and organizational messages) are stored in the local buffer. Once WinCC becomes available
again, the buffered messages are processed. This mechanism achieves two aims:
● Form the perspective of the stations, the master station can be reached when WinCC is
not available.
● General requests resulting from temporary deactivation of WinCC are avoided.
Local TIM
A TIM connected to a PC (ST7cc, ST7sc) or an S7 CPU over the MPI bus, Industrial
Ethernet or an IP-based network.