Communications
configuring
System- and communication configuring D7-SYS - SIMADYN D
3-127
Edition 12.2003
3.8 DUST1
coupling
The DUST1 coupling is a basic serial point-to-point connection. The
communication utilities, service and process data can use the DUST1
coupling.
The main application of the DUST1 coupling is to establish
communications with CFC or the basic service tool to commission a
configured software package.
The DUST1 coupling is available in two versions:
•
With CS7 coupling module and SS4 communications module
−
communication utilities, service or process data, can be configured.
−
the coupling can be accessed from all CPUs.
•
With a local X01 interface on the CPU (this versions is not described
in any further detail here)
−
the communications utility service is always available and does not
have to be configured.
−
only one single CPU can be controlled via this service interface.
3.8.1 Hardware
structure
The following hardware is required for the DUST1 coupling:
•
CS7 communications module with a SS4 communications module
The cable interface uses RS232, but can also be changed-over to 20 mA
or RS485 by inserting SS2 or SS3 interface sub-modules.
Generally, RS232 is used when connecting CFC or the basic service tool.
3.8.2 Configuring
For the serial DUST1 coupling, the telegram lengths are restricted to
256 bytes per channel (and therefore per function block).
Central block @CSD01 is available to configure DUST1 via a
communications module SS4 in a communications module CS7. This
block has the task to initialize and parameterize the data interface on a
communications module. The CS7 communications module can be
accessed from all CPUs.
The channel name and address stage 1 are specified at the AT-, AR- and
US inputs of the transmit- and receive blocks. A unique number between
0 and 255 should be specified in address stage 1. At system run-up, it is
identified whether a number has been assigned a multiple number of
times for several blocks. Address stage 2 does not have to be configured.
Application
Required hardware
Cable interface
General
Central coupling
block
Transmit/receive
blocks