Siemens SINUMERIK 840D sl Function Manual

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Special feature of Phase 3In the following cases, the machine axis stops first after detection of the zero mark and thentraverses back to the reference point:● Because of the reference point positioning velocity, the sum of reference point distanceand reference point offset is less than the required braking distance:MD34080 + MD34090 < "required braking distance due to MD34070"● The reference point is located, opposite to the current travel direction, "behind" thereference cam.(reference point approach velocity)Reference camVelocity(reference point creep velocity)Distance=HURPDUNUHIHUHQFHSRLQWYDOXHMD34100 $MA_REFP_SET_POS [0 ... 3]MD34040 $MA_REFP_VELO_SEARCH_MARKERMD34020 $MA_ REFP_VELO_SEARCH_CAMFigure 15-11 Reference point distance plus reference point offset less than braking distance15.6 Referencing with distance-coded reference marks15.6.1 General overviewDistancecoded reference marksMeasuring systems with distance-coded reference marks consist of two parallel scale tracks:● Incremental grating● Reference mark trackThe distance between any two consecutive reference marks is defined. This makes it possibleto determine the absolute position of the machine axis when two consecutive reference marksare crossed. For example, if the distance between the reference marks is approx. 10 mm, atraverse path of approx. 20 mm is all that is required to reference the machine axis.Referencing can be performed from any axis position in the positive or negative direction(exception: end of travel range).R1: Referencing15.6 Referencing with distance-coded reference marksBasic FunctionsFunction Manual, 01/2015, 6FC5397-0BP40-5BA2 1167