Interbus 79/176
3 842 530 344/2014-05, MIT: ID 40,
Bosch Rexroth AG
8.8.2
“Outfeed” application
Outfeed points are where it is decided whether or not the workpiece pallet is
diverted. The workpiece pallets do not need to stop at the SLK before the junction,
since the amount of data needed for the decision is small. In this example, 8 bytes
should be read starting at MDT address 0x02F0. The MDT status is also transmitted
in order to allow any errors in the MDT to be addressed.
The data is read from the MDT through an
unbuffered prefetch
, then the link
immediately switches from
PRECONNECTED
to
CONNECTING
, since auto reconnect is
active.
SLK preparation
No.
PCP
communication
Index
Subindex 0 Subindex 1
Subindex 2 Subindex 3
1
Deactivate
unbuffered
prefetch so no
parameters are
set
0x5FF1 0x0000
2
Delete old
prefetch entries
0x5FF1 0x0004
3
Set parameters
for first data
block in unbuf-
fered prefetch:
1-byte MDT
status
0x5FF0
0x00020000 0x0001
4
Set parameters
for second data
block in unbuf-
fered prefetch:
8 bytes starting
from MDT ad-
dress 0x02F0
0x5FF0
0x000002F0 0x0008
5
Finished setting
parameters, acti-
vate unbuffered
prefetch
0x5FF1 0x0001
6
Switch SLK to
auto reconnect
mode
0x5FF5
0x00030002 0x0001
0x01
Write data
7
Make SLK
ready to receive
(CONNECT)
Via process data channel:
Byte 0: 0x81 (switch trigger bit: now 1, used to be 0)
8
SLK operation
Wait until event counter in event-oriented data channel (see Chapter 7.3.1 “Status informa-
tion in event-oriented data channel”) to increase by 1. At this time, a workpiece pallet has
arrived, event-oriented data exchange has occurred with the MDT and the link for the next
MDT is back to
CONNECTING
. The MDT status and the application data can be checked
The requested data bytes are sent to the fieldbus master through the event-oriented
data exchange for every MDT. The data can be provided for additional evaluation using a
controller function block.
PROOF COPy 1 | 20.05.2014 | FOR INTERNAL USE ONLy
EN
GLISH
