Siemens SINUMERIK 840C Installation Instructions Manual page 606

8 PLC Machine Data (PLC MD)
8.5 PLC MD for the operating system (system bits)
PLC MD
DB63
7
DW No.
1)
6012
DL 6
Default value: 0000 0001
This MD enables the interchange of spindle signals between NC and PLC. As the basic
configuration of the 840T includes only one spindle, bit 0 must be "1".
If more than one spindle is available, you must set the bits corresponding to the channels in
this MD. The highest spindle number is entered in PLC MD 9. Options E41, F05 and F06
enable the use of as many as six spindles.
PLC MD
DB63
7
DW No.
1)
6016
DL 8
8
1)
6017
DR 8
16 15
6018 1)
DL 9
24 23
1)
6019
DR 9
Default value: MD 6016 0000 0111
MD 6017 0000 0000
Use this MD to enable the signals of the axes between the NC and the PLC. As the basic
configuration of the 840T includes two axes, bits 0 and 1 in MD 6016 must be set to "1".
If there are more than two axes, the corresponding bits must be set in this MD.
The highest axis number is specified in PLC MD 10.
Fictitious axes for transformation (option 6FC5 150-0AD04-0AA0) must also be declared in the
PLC MDs. Options A01 to A06 provide for more than two real axes.
After each restart, the PLC system obtains the information required from the relevant NC
machine data and stores it in the data blocks DB60 and DB63, which means that
- the other PLC MD remain active
- the PLC processes only those channels, spindles and axes actually defined via NC MD
- any changes in the number of channels, spindles or axes will become effective only after a
PLC restart.
_______
1) As from software version 3, these PLC MD are irrelevant, they are only used for display purposes
8–14
Bit No.
6 5 4
6 5
Bit No.
6 5 4
Signals from/to axis
7 6 5
Signals from/to axis
14 13
Signals from/to axis
22 21
Signals from/to axis
30 29
© Siemens AG 1992 All Rights Reserved
3 2 1
Signals from/to spindle
4 3 2
3 2 1
4 3 2
12 11 10
20 19 18
28 27 26
6FC5197- AA50
SINUMERIK 840C (IA)
09.95
0
1
0
1
9
17
25