Siemens SINUMERIK 840DE SL - 2.1.3 Positioning monitoring

Detailed Description
2.1 Motion monitoring functions
Axis Monitoring, Protection Zones (A3)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
2-3
Effectivity
The following error monitoring only operates with activated position control for:
• Linear axes with and without feedforward control
• Rotary axes with and without feedforward control
• Position-controlled spindles
Fault case
In case of a fault after exceeding of the configured tolerance limit, the following occurs:
• Alarm: "25050 Axis <
Axis identifier > Contour monitoring"
• The affected axis is stopped via the configured braking ramp in follow-up mode:
MD36610 $MA_AX_EMERGENCY_STOP_TIME
(Time for braking ramp when an error occurs)
• If the axis/spindle is involved in interpolation with other axes/spindles, these are brought
to a standstill with rapid stop (set velocity = 0).
2.1.3 Positioning monitoring
Function
At the end of a positioning operation:
• Set velocity == 0 AND
• DB31, ... DBX64.6 / 64.7 == 0 (traverse command minus / plus)
checks the positioning monitoring that the following error of every participating machine axis
is smaller than the exact stop fine tolerance during the delay time.
• MD36010 $MA_STOP_LIMIT_FINE (exact stop fine)
• MD36020 $MA_POSITIONING_TIME (delay time exact stop fine)
Note
The smaller the exact stop fine tolerance is, the longer the positioning operation takes
and the longer the time until block change.