Siemens SINUMERIK 840C User Manual
Page 616
8 PLC Machine Data (PLC MD)
09.95
8.5 PLC MD for the operating system (system bits)
6052
DL 26
7
6
5
4
3
2
1
0
6053
DR 26
7
6
5
4
3
2
1
0
PLC MD
DB63
DW No.
Bit No.
7
6
5
4
3
2
1
0
Enable central interrupt byte IF PLC/PLC 135 WD
Reserved
Default value:
0
An EU interface module's eight interrupt inputs can be enabled separately.
Bit = 0
Input is disabled
Bit = 1
Input is enabled for OB 2 call
Also see PLC MD 30.
6055
DR 27
7
6
5
4
3
2
1
0
6056
DL 28
7
6
5
4
3
2
1
0
PLC MD
DB63
DW No.
Bit No.
7
6
5
4
3
2
1
0
Edge central interrupt byte IF PLC/PLC 135 WD
Reserved
Default value:
0
A signal change at an EU IM interrupt input triggers the interrupt that invokes OB 2 (enable via
PLC MD 6052). The signal edge (i.e. positive or negative edge) that is to trigger the interrupt
can be specified separately for each interrupt input.
Bit = 0
Positive edge triggers interrupt
Bit = 1
Negative edge triggers interrupt
The system program checks the machine data for the interrupt-generating I/Os for validity on
cold restart. The PLC issues an error message and goes to STOP when illegal machine data
are encountered. Also see PLC MD 30.
6061
DR 30
PLC MD
DB63
DW No.
Bit No.
7
6
5
4
3
2
1
0
Default value:
All bits default to 0
8–24
© Siemens AG 1992 All Rights Reserved 6FC5197- AA50
SINUMERIK 840C (IA)