Communications
configuring
System- and communication configuring D7-SYS - SIMADYN D
3-89
Edition 12.2003
description of the variable is in this case checked for consistency with
the expected description.
•
Addressing
An object can be uniquely addressed using its index in the OV
(addressing per index) or using its (optional) name (addressing per
name or symbolic addressing).
All of the objects in SIMADYN D-OV can be optionally addressed per
index or per name (if available). The configuring engineer defines
whether an object is to be addressed via its index or its name.
SIMADYN D, as client, addresses in the productive phase (read, write
utilities) the variables per index. If the configuring engineer addresses
the variables per name, then SIMADYN D first executes a "Get OV"
with addressing per name, in order to receive the index of the
variables.
•
Communications association:
A communications relationship defines the route and type of
communications between the associations. For two stations, which
communicate with one another per FMS, a communications
association must be configured which corresponds with that of the
other. For connection-oriented communication associations, a
connection is first established before an FMS utility can be realized
using it; communication associations such as these are only possible
between two stations. For communication associations without
connection, several stations can communicate with one another
(broadcast associations).
Communications reference
Number, which refers to a communications association.
The SIMADYN D communications utilities, process data and message
system, are realized on PROFIBUS layer 7 (FMS).
What does implemented on FMS mean?: All of the data to be transferred
are defined as object and processed using the FMS utilities, essentially
with the "Read" and "Write" FMS utilities. Instead of "A sends data to B",
"A (client) writes into an object in B (server)" or alternatively with
interchanged roles "B (client) reads an object in A (server)".
For FMS utilities, there is always one client and one server. A data object
is always defined in the server and must be available in its object
directory (OV).
What does open implementation mean?: The structure of the data object
is open, i. e. it can be read via the FMS utility "Get OV". The SIMADYN D
utilities, process data and message system, are implemented as open
utilities.
Each bus station requires the following to function on the bus:
•
Bus parameters
These include baud rate, PROFIBUS address and other parameters
which influence the bus speed. Baud rate and PROFIBUS address
are specified using CFC. All of the other bus parameters are set using
COMSS5.
General
Realized on FMS
Open
implementation
Requirements
