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 7
914*
Default value: all bits default to 0
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 7
Toggle Toggle
output bit 7 output bit 6
916*
on emer- on emer-
gency gency
1)
retraction retraction
Toggle of outputs for retraction enabled: Bits 7 to 0
Bit 0-7 Bit 0-7=1 The corresponding bit in the output byte of the mixed I/O module is
inverted when a retraction is triggered by this channel.
Bit 0-7=0 The corresponding bit in the output byte of the mixed I/O module
remains unaltered on retraction.
Active: at once
NC MD 7
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
it, stopping as well as retraction is requested.
Bit 0=0 No alarm or Mode Group Stop is triggered if a fault is detected.
_______
1) As from SW 4
6–156
Bit No.
6 5 4
Bit No.
6 5 4
Toggle Toggle
output bit 5 output bit 4
on emer- on emer-
gency gency
1) 1) 1)
retraction retraction
Bit No.
6 5 4
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Siemens AG 1992 All Rights Reserved
3 2 1
3 2 1
Toggle Toggle Toggle
output bit 3 output bit 2 output bit 1
on emer- on emer- on emer-
gency gency gency
1) 1)
retraction retraction retraction
3 2 1
NC-
controlled
ext. stop.
and retract.
1)
SINUMERIK 840C (IA)
10.94
0
Channel
with FIFO
(up to SW2)
0
Toggle
output bit 0
on emer-
gency
1) 1)
retraction
0
Trigger
alarm +
mode group
stop on
1)
error
6FC5197- AA50