Communications configuring
3-32
System- and communication configuring D7-SYS - SIMADYN D
Edition 12.2003
•
STF (SINEC technological functions)
is the definition of SINEC H1 layer 7, defined in the
"SINEC AP 1.0 Specification" from Siemens. The variable utilities
used for SIMADYN D
which are in conformance with MMS, are part of
STF.
•
Client
The client issues the task to an STF utility and initiates
communications.
•
Server
The server accepts an STF utility and is the responding party in the
communications. The server defines objects, which a client can
access using STF utilities.
•
Variable
A variable is a basic or complex object for a server. The client can
access the variables using STF variable utilities.
•
Read variable
With this STF utility, a client reads the value of a variable at a server.
The client sends the task "Read variable X"; the server sends, as
response, the value of the variables.
•
Write variable
Using this STF utility, a client changes the value of a variable at a
server. The client sends the task "Write variable X" together with the
new values to the server; the server acknowledges this.
•
Data transport connection
The data transport connection is a defined communications path
between two bus nodes at OSI layer 4. A data transport connection
must be configured using NML. It must be configured so that it
coincides for both bus nodes. When the bus nodes run up, the data
transport connections are first established and only after that is data
transfer possible.
•
Application association
The application association is a defined communications path
between two bus nodes at OSI layer 7 (STF). An application
relationship must be configured using NML. It must be configured so it
coincides for both bus nodes.
Application associations are based on a data transport connection.
3.4.1
Hardware and central coupling block
3.4.1.1 Hardware
The following hardware is required for a SINEC H1 coupling:
•
Subrack with C-bus connection
•
CPU
Terminology for
SINEC H1
Requirements
