Siemens sinumerik 840D sl Function Manual page 374

Detailed description
2.7 Extended stop and retract (ESR)
Alarm behavior
• Errors in an axis outside the EG axis grouping:
• Error in a leading axis (LA):
• Error in a following axis (FA):
• Error in the retraction axis: There is no retraction.
• EMERGENCY STOP
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.
Block search, repositioning
Extended stop and retract does not affect block search or repositioning motions.
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This axis switches off "normally". Stop and retract continue "undisturbed" or are triggered
by this type of error.
selective switchover to actual value linkage already during stop, otherwise as previously.
– 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
workpiece/tool must be left to the retraction; however, the stop should not disrupt the
process any further.
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 movements, and also releases the
electronic coupling by cancelling control system enabling.
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
Special functions: Axis Couplings and ESR (M3)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0