Siemens SINUMERIK 840C Installation Instructions Manual page 341

6 NC Machine Data (NC MD), NC Setting Data (NC SD)
6.6.6 Channel-specific MD bits 2
NC MD
914*
Default value:
Bit 0 Bit 0=0 Channel without FIFO
Bit 0=1 Channel with FIFO
Active: On warm restart/Power On
If FIFO is selected for the four MDs only once, the entire storage space (30 Kbytes) is
allocated to the respective channel.
If two FIFO channels are selected, these two channels share the available storage space
(15 Kbytes per channel).
If more than two channels are defined, an error message ("Too many FIFO channels defined"
alarm) is issued.
NC MD
Toggle
output bit 7
916*
on emer-
gency
retraction
Toggle of outputs for retraction enabled: Bits 7 to 0
Bit 0-7 Bit 0-7=1
Bit 0-7=0
NC MD
918*
Bit 1 Bit 1=1 NC-controlled extended stopping and retraction enabled.
Bit 1=0 NC-controlled extended stopping and retraction disabled.
Bit 0 Bit 0=1 When a fault is detected an alarm and Mode Group Stop is triggered and, with
Bit 0=0 No alarm or Mode Group Stop is triggered if a fault is detected.
_______
1) As from SW 4
6–156
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7 6 5
all bits default to 0
7 6 5
Toggle Toggle
output bit 6 output bit 5
on emer- on emer-
gency gency
1) retraction 1) retraction
The corresponding bit in the output byte of the mixed I/O module is
inverted when a retraction is triggered by this channel.
The corresponding bit in the output byte of the mixed I/O module
remains unaltered on retraction.
Active: at once
7 6 5
it, stopping as well as retraction is requested.
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Bit No.
4 3
Bit No.
4 3
Toggle Toggle Toggle
output bit 4 output bit 3 output bit 2
on emer- on emer- on emer-
gency gency gency
1) retraction 1) retraction 1) retraction
Bit No.
4 3
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Siemens AG 1992 All Rights Reserved
10.94
2 1 0
Channel
with FIFO
(up to SW2)
2 1 0
Toggle Toggle
output bit 1 output bit 0
on emer- on emer-
gency gency
1) retraction 1) retraction 1)
2 1 0
NC- Trigger
controlled alarm +
ext. stop. mode group
and retract. stop on
1) 1)
error
6FC5197- AA50
SINUMERIK 840C (IA)