Accessing data on the ID 40/MDT 45/176
3 842 530 344/2014-05, MIT: ID 40,
Bosch Rexroth AG
6.7 Auto reconnect function
Auto reconnect
allows data to be exchanged with an MDT without stopping the
workpiece pallet in front of the SLK. A typical application for this is a transfer station
where it has to be decided whether the workpiece pallet continues forward or is fed
out. Normally minimal information from the MDT is sufficient for this purpose. See
also Chapter 7.9.2 “Transfer' application”.
This information can be transmitted by the MDT to the SLK as it passes by. The
desired data is read from the MDT with the prefetch function (in
PRECONNECTED
state), then communication with the MDT is automatically terminated. The field does
not turn off once communication with the MDT stops, i.e., the SLK can immediately
accept another MDT. No bus communication is necessary to control these processes.
The data read in prefetch is transmitted to the application through an event-oriented
data exchange (see Chapter 6.2 “Event-oriented data transmission”).
Automatically terminating communication with the MDT is turned on and off through
auto mode (see Chapter 5.3.3 “Auto mode”).
It is not possible to access the MDT with the command-oriented data exchange
when auto reconnect is active, since the link state
CONNECTED
is bypassed.
Fig. 20:
Phase 2
HF field on
Phase 1
HF field off
Phase 3
Data
transmission
MDT registers with
the SLK
System Start
Not done
Link state
PRECONNECTED
Link state
DISCONNECTED
Done
Not done
Link
request
CONNECT
Done
Display:
Display:
Display:
Link states for auto reconnect
PROOF COPy 1 | 20.05.2014 | FOR INTERNAL USE ONLy
EN
GLISH
