Siemens SINUMERIK 840C - Manual (Page 995)

12 Functional Descriptions 09.95
12.19.6 Stopping
12.20.6.1 Stopping as open-loop control function
The time characteristics of this reaction type are shown in the diagram.
Parameterizable/programmable stop operation as open-loop control function
n
T1
(MD)
324
T2
(MD)
325
T3
1452*
or 495*
Mode group stop
t
FA/FS
In the case of mode group stop errors, the following reactions are possible (times T1 to T3 can
be parameterized via MD):
T1 Within time T1:
1.) All
• leading axes/spindles
• and all axes/spindles which are explicitly requested by means of programming, but
are not leading axes or spindles as well as
• axes which interpolate with the leading axes/spindles specified above and all axes
which interpolate with axes/spindles explicitly requested through programming
instructions are controlled as an interpolative function, thus ensuring that the
motion is continued (contour accuracy),
2.) All FA/FS remain linked,
3.) All other axes/spindles not mentioned under 1. and 2. are immediately switched to
follow-up mode.
T2 Within time T2:
1.) All the above drives are braked interpolatively down to 0 as a function of acceleration
2.) All FA/FS remain linked.
These characteristics (T1 + T2) can also be activated for EMERGENCY STOP (via NC-
MD 5022, bit 0).
T3: Within time T3:
All FA/FS are made to follow as a closed-loop control function (MD 1452*/495*). All other
axes switch to "Follow-up" mode (MD 1224*/447*). On expiry of T3, the FA/FS are also
switched to follow-up mode.
This reaction is generally initiated for linked GI groupings as well as for drives programmed by
means of G functions provided that the machine data for extended stopping and for times T1
and/or T2 have been parameterized.
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SINUMERIK 840C (IA)