Technical data

Glossary
Software
System Manual, 07/2009, C79000-G8976-C222-07
459
See also → "Conditional spontaneous message" and → "Unconditional spontaneous
message"
Spontaneous mode
The spontaneous mode is a method of SINAUT data transmission in which subscribers can
exchange data among themselves directly. Here, no central entity is necessary in the form of
a master TIM as in polling mode (see "Polling mode"). The spontaneous mode is intended
for data transmission in dial-up networks and for communication via IP-based networks.
For transmission in a dial-up network and in pay-by-volume/time IP-based networks (for
example GPRS), the data to be sent is assigned different priorities during parameter
assignment ("high" or "normal", with TD7onTIM also "alarm"). When data with high or alarm
priority are ready for transmission, the dial-up connection is established immediately. If the
data has "normal" priority, it is first stored on the TIM. This data is then sent the next time a
connection is established to the partner for whatever reason. This can, for example, be the
situation when information with higher priority needs to be sent or when the partner
establishes a connection to exchange data.
Squelch
Squelch
Squelch reduces the interfering noise in communications during breaks in transmission. This
increases the signal-to-noise ratio.
ST7 message
ST7 messages consist of a frame, an area for addresses and control fields (message
header) and an area for net data (object data) with the time stamp. The ST7 messages are
divided into organizational messages and data messages. The structure of an ST7 message
is based on the guidelines of the ST7 protocol.
ST7 protocol
This protocol is used in the SINAUT ST7 system for transmitting process data over WANs.
ST7cc
SINAUT ST7cc is the ideal control center system based on SIMATIC WinCC for SINAUT
ST7.
It is specially designed for event-driven and time-stamped data transmission in the SINAUT
system. It avoids the possible loss of data that can occur with cyclic polling in WinCC. It also
ensures the use of the correct event time supplied by the SINAUT stations for all WinCC
messages and archive entries. The integrated process image contains all process data as
well as the status of all SINAUT subscribers in the network and makes this data available
directly to WinCC for fast transfer to the process image.