Sample Applications; Manual Workstation" Application - Bosch Rexroth ID 40 Manual

Interbus 77/176

8.8 Sample applications

The following examples show some typical applications of the ID 40 system using
Interbus.
8.8.1

"Manual workstation" application

Outfeed point
Workstation
Fig. 26: Sample "manual workstation" application
The MDT should be read and written at a processing station. First, 32 bytes should
be read from the MDT address 0x0110, then 50 bytes should be written from the
MDT address 0x0100. The MDT status is also transmitted in order to allow any errors
in the MDT to be addressed.
The actual link state is read in an event-oriented manner to determine whether or not
a new MDT is in the link. Since the link state is contained in the event-oriented data
channel by default (see Chapter 8.4 "Event-oriented data exchange"), the SLK does
not need an additional configuration command.
The remaining data is exchanged with the MDT by command in the CONNECTED
state. The MDT then signs off with the commanded link state RECONNECT. At the
same time, the SLK switches to the CONNECTING state to wait for the next MDT.
Command-oriented data exchange occurs in Interbus through PCP communication.
SLK preparation
The link CONNECTING is configured through the process data channel.
See Chapter 8.5 "Commanded link state via process data channel".
SLK operation
Check the actual link state until the value CONNECTED appears (2). A new MDT has
now arrived. The controller reads the MDT status (4). When the MDT status does not
indicate an error, the user data can now be read starting with MDT address 0x0110.
Once this data has been evaluated and the workpiece processed, the result of
the processing is written to the MDT (6). Communication with the MDT is then
terminated (8).
3 842 530 344/2014-05, MIT: ID 40, Bosch Rexroth AG
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