Default Process For Slk-Mdt Communication; Open Transfer" And "Close Transfer" Functions - Bosch Rexroth ID 40 Manual

44/176 Accessing data on the ID 40/MDT
Bosch Rexroth AG, MIT: ID 40, 3 842 530 344/2014-05
PROOF COPy 1 | 20.05.2014 | FOR INTERNAL USE ONLy

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
Phase 1
HF field off
Phase 2
HF field on
Phase 3
Data
transmission
Data exchange between
PLC and MDT via SLK
Phase 1
HF field off
Fig. 19: 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.
System Start
Link state
DISCONNECTED
Link
request
Not done
CONNECT
Done
MDT registers with
the SLK
Done
Link state
PRECONNECTED
Link state CONNECTED
Link
request
Not done
DISCONNECT
Done
Display:
Display:
Not done
Display:
Display: