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Send buffer principle
If a send message is transmitted using the send buffer principle, each time the message is
transferred to the TIM, it is entered completely in the send buffer. If such a message cannot
or should not be transmitted immediately, it may exist more than once in the send buffer.
When it is sent, the message is taken completely from the send buffer and transmitted.
See also Image memory / send buffer
Setpoint
A setpoint is a selected digital or analog value that is transmitted once after the value has
been set. The entered value is recalculated when necessary. A setpoint is always
transmitted as 1 word. At the receiving end, the setpoint can either the output directly to the
process as an analog signal (for example to an external controller) or the value is made
available to the local program for further processing (setpoint for internal controller, limit
value, threshold value etc.).
Setpoint and command input are interlocked for safety reasons; in other words, a setpoint
input cannot be made at the same time as a command input. In this case, the acquisition
program recognizes an error. Neither the setpoint nor the command are transmitted.
SIM card
The SIM card is an identification card for a subscriber of a GSM mobile wireless network.
(SIM: Subscriber Identity Module)
SIMATIC S7
Siemens automation system
Simple Internet communication
In SINAUT ST7, simple Internet communication means data exchange between TCP/IP-
compliant devices in Ethernet, landline or mobile wireless networks using the MSC protocol.
SINAUT
SIemens Network AUTomation
Station control system or telecontrol system based on SIMATIC S7
SINAUT message
Message used by the SINAUT ST7 or SINAUT DNP3 protocol. SINAUT messages are
divided into organizational messages and data messages.
ST7 messages contain the data of an ST7 object to be transmitted. Depending on the object
type, a message can contain either all data of an ST7 object or a contiguous subarea of the
object data.
SINAUT ST7 station control system
System Manual, 09/2016, C79000-G8976-C178-10
Glossary
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