Siemens SINUMERIK 840C Installation Instructions Manual page 289

6 NC Machine Data (NC MD), NC Setting Data (NC SD)
6.6.1 General MD bits (general bits)
NC MD 7
5020
Default value: 0
Bit 2 Bit 2 = 1 Emergency retraction off (G420) for all channels
Meaning:
Monitoring of the ER sources, specified via MD, OFF for:
- the channel where the part program is executed
- all axes of the mode group for ALL channels incl. PLC
- all spindles of the mode group for ALL channels incl. PLC
G420 X S1 =
Meaning:
Monitoring of the ER sources, specified via MD, OFF for:
- the X axis for ALL channels incl. PLC
- the spindle S1 for ALL channels incl. PLC
"G420/G421" from PLC:
Axis-specific:
Spindle-specific:
Monitoring for axes (FA/FS) can also be switched on/off from PLC. If
monitoring is switched off from PLC, it is switched off for all channels.
Bit 2 = 0 Emergency retraction off (G420) in current channel
NC MD 7
5021
Neutral position of mixed I/O outputs bit 5 to 0
Bit 5-0=1 After Mode Group Reset the output byte of the mixed I/O module is at high
level (24 V).
Bit 5-0=0 After Mode Group Reset the output byte of the mixed I/O module is at low
level (0 V).
Active: On Power On
_______
1) As from SW 4
6–104
Bit No.
6 5 4
DB29 DR K+ 2.5
DB29 DR K+ 26.5
Bit No.
6 5 4
Neutral Neutral
position of position of
outputs for outputs for
mode group mode group
1) 1)
6 5
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Siemens AG 1992 All Rights Reserved
3 2 1
Emergency
retraction
off (as from
SW4.7
SW 5.2)
DL K+ 2.5
DL K+ 26.5
3 2 1
Neutral Neutral Neutral
position of position of position of
outputs for outputs for outputs for
mode group mode group mode group
1) 1) 1)
4 3 2
SINUMERIK 840C (IA)
04.96
0
0
Neutral
position of
outputs for
mode group
1)
1
6FC5197- AA50