44/176 Accessing data on the ID 40/MDT
Bosch Rexroth AG
, MIT: ID 40, 3 842 530 344/2014-05
6.5 Default process for SLK-MDT communication
The ID 40 system works in three phases:
•
Phase 1
: No data exchange between SLK and MDT.
The HF field is off
•
Phase 2
: Data exchange possible between SLK and MDT.
The HF field is on.
•
Phase 3
: Data transmission between PLC and MDT
Fig. 19:
Phase 2
HF field on
Phase 1
HF field off
Phase 1
HF field off
Phase 3
Data
transmission
MDT registers with
the SLK
System Start
Not done
Link state
PRECONNECTED
Link state
CONNECTED
Link
request
DISCONNECT
Done
Link state
DISCONNECTED
Done
Not done
Link
request
CONNECT
Done
Display:
Display:
Display:
Display:
Data exchange between
PLC and MDT via SLK
Not done
Default process for SLK-MDT communication
6.6 “Open transfer” and “Close transfer” functions
Due to the new MDT lifeguarding function (see Chapter 6.9 “MDT lifeguarding”), the
transfer channel functions are obsolete.
However, existing applications do not need to be adjusted, since an SLK running
software version 3.11 or higher accepts the old transfer channel commands.
However, no function is executed in the SLK.
PROOF COPy 1 | 20.05.2014 | FOR INTERNAL USE ONLy
