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Glossary
SINAUT ST7 protocol
This protocol is used in the SINAUT ST7 system for data transmission via classic WAN
networks and IP-based networks. It is not compatible with DNP3.
SNAP
Subnetwork Access Protocol
Spontaneous message
Unsolicited messages are generated and transferred if a process value changes or event-
driven.
Spontaneous mode
The unsolicited or spontaneous mode is a type of transmission with which stations send
messages on their own initiative without the station being polled by the master station (see
"Polling mode"). Unsolicited messages can be sent for data points that are configured as an
event.
ST7 protocol
Protocol for transmitting process data over WANs in the SINAUT ST7 system.
Station
In the telecontrol world, the term station includes the entire hardware components of a
SIMATIC station required for detection, processing and communication with other stations or
a master station. A station can, for example, consist of a modem, a TIM and a programmable
controller (in turn consisting of a CPU and I/O modules).
Station TIM
WAN interface of a TIM set to the "station" function. Use in stations.
Status message
A status message is a process status (for example pump on, valve open) or alarm (for
example limit value exceeded). This is binary information with the values 0 or 1.
TD7 library
The TD7 software in the stations allows change-driven transmission of process data
between the individual CPUs and the control center, for example ST7cc. Failure of
connections, CPUs, or the control center are displayed. Once a problem has been corrected
or the CPUs or control center have started up, data is updated automatically. When
necessary, data messages can be given a time stamp.
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System Manual, 12/2015, C79000-G8976-C253-04
TIM DNP3
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