Siemens SINUMERIK 840C Installation Instructions Manual page 998

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The following individual sources are also available:

Axis/spindle-specific sources:

Activation of sources:

The user determines which of the possible axis sources initiate a retraction and which do

not in an axis-specific and spindle-specific MD byte NC MD 530* 596*.

Sources specific to channel/mode group and general sources:

Activation of sources:

The user determines which sources are active and which are not in a channel-specific MD

byte NC-MD 920*.

External sources via HW inputs:

A retraction process can be initiated from and external source (provided input is active) by

means of a mode group-specific input byte of the mixed I/O or CSB (can be defined by

means of MD).

Activation of input bits:

An MD byte NC-MD 922* is assigned to each channel; this byte is used to define which

input bits are active and which are not.

A retraction process is initiated if a low-level signal is present at an active input bit of the

mixed I/O, i.e. low-active inputs; 24 V must be applied to the active inputs before the

retraction is enabled.

Emergency retraction is only applied to axes that are under closed-loop control (i.e. controller

enable must be set).

SINUMERIK 840C (IA)

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Retraction threshold FA/FS exceeded

DC link voltage warning threshold

Generator minimum speed limit

Mode group stop of channel mode group

EMERGENCY STOP

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6FC5197- AA50

12 Functional Descriptions

12.19.7 Retraction

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