Part Program Start, Nc Start; Alarm Behavior; Block Search, Repos - Siemens SINUMERIK 840D sl Function Manual

9.2.10.4

Part program start, NC start

In order that a defined initial state is available when a part program starts, the programmed
absolute retraction positions and the enable signals of the retraction axes are deleted when
the part program starts.
Note
Retraction positions and enable signals
When a part program starts, the absolute retraction positions (POLF) and the enable signals
of the retraction axes (POLFMASK) must be reprogrammed corresponding to the actual
requirements.
9.2.10.5

Alarm behavior

The alarm response depends on the axis in which a fault occurs:
● Fault in an axis outside the axis grouping of an electronic gear:
This axis switches off "normally". Extended stopping and retraction continue to operate as
before - or are initiated by such a fault.
● Error in a leading axis (LA):
selective switchover to actual value linkage already during stop, otherwise as previously.
● Error in a following axis (FA):
– Carry out retract: Retraction axis may not be a following axis, that is, no conflict.
– Carry out stop: The following axis may react with uncontrollable behavior. Saving the
● Error in the retraction axis: There is no retraction.
● Emergency Stop
An Emergency Stop is not a fault from a control system point of view, rather the response
is the same as for any other control signal. For safety reasons, Emergency Stop interrupts
the interpolation and all traversing motion, and also cancels the electronic coupling by
withdrawing the controller enable signals.
In applications where the coupling and traversing movements must remain valid after
Emergency Stop, the PLC must delay the Emergency Stop long enough for the required
NC or drive-end reactions to terminate.
The following interface signal is available as feedback signal to the PLC:
IS "ESR reaction not initiated" DB31, ... DBX98.7
If an alarm with cross-channel NOREADY reaction is issued during the active phase of the
ESR (i.e. NOREADY | NCKREACTIONVIEW | BAGREACTIONVIEW), then ESR is triggered
in all channels.
9.2.10.6

Block search, REPOS

Extended stop and retract does not affect block search or REPOS motions.
Special functions
Function Manual, 01/2015, 6FC5397-2BP40-5BA2
workpiece/tool must be left to the retraction; however, the stop should not disrupt the
process any further.
R3: Extended stop and retract
9.2 Control-managed ESR - 840D sl only
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