Retraction; Sources - Siemens SINUMERIK 840C Installation Instructions Manual

12 Functional Descriptions

12.20.7 Retraction

12.20.7
The retraction motion can be parameterized and programmed.
The following diagram shows the possible sources and the associated reactions for the
extended, parameterizable and open-loop controlled retraction without giving the programmable
retraction motions.
Axis/spindle-
specific sources
DC link warning threshold
Generator minimum
speed limit
NC MD 530* 596*
1 MD byte
for enabling
per axis/spindle
0: Signal not operative
1: Signal operative
Axis/spindle-
specific interface
Retraction signal
Programmable retraction as open-loop control function
There are two categories of retraction, i.e.
• as an open-loop control function and
• as an autonomous drive function.

Sources

There are four source areas for the retraction process:
• Internal axis/spindle-specific sources,
• Internal sources specific to channel/mode group or general sources,
• External sources via HW inputs,
• Communications failure (autonomous drive sources which initiate generator-mode braking
of the drive).
12–222
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Retraction
Channel-specific/
general sources
Emergency retraction
threshold FA
1 MD byte
for enabling
per channel
NC MD 529* 592*
1 MD byte
for enabling
per axis/spindle
and channel
0: Reaction is not initiated
DB 29 - DB 31
1: Reaction is initiated
e.g.: Mode group stop
e.g.: Alarm
e.g.: Internal retraction
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External sources
Mode group stop
EMERGENCY HW input
STOP (1 byte per mode group)
NC MD 920*
1 MD byte
for enabling
• Mixed I/O
per channel
• CSB
NC MD
NC MD 918*
528* 588*
1 MD byte
per axis/spindle
and channel
HW output
One byte per mode group
© Siemens AG 1992 All Rights Reserved
10.94
NC MD 922*
NC MD 916*
Channel-specific
interface DB 10-DB 15
6FC5197- AA50
SINUMERIK 840C (IA)