Stopping As Open-Loop Control Function - Siemens SINUMERIK 840C Installation Instructions Manual

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12 Functional Descriptions

12.19.6 Stopping

The time characteristics of this reaction type are shown in the diagram.

Mode group stop

Parameterizable/programmable stop operation as open-loop control function

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:

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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Stopping as open-loop control function

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),

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