Siemens SINUMERIK 840D sl Function Manual

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● The load-side zero mark search rate MD34040 $MA_REFP_VELO_SEARCH_MARKERshould not exceed the limiting frequency of the absolute trace of the encoderMD36302 $MA_ENC_FREQ_LIMIT_LOW.If the speed is too high, absolute information cannot be read any more, and thus, noequivalent zero marks are generated.● If no zero marks are found within:MD34060 $MA_REFP_MAX_MARKER_DISTotherwise, an alarm will be triggered.● A start of the zero mark search with the override of a BERO (MD34200 = 5) is not supported.MD34200 = 0 is to be used as a equivalent.● The following MD must be set if the absolute encoder retains even the referenced statusthrough POWER OFF, besides the last position:MD34210 $MA_ENC_REFP_STATE = 2Data backup and standard commissioningSome properties of an absolute encoder restrict the transfer of series startup files to othermachines. The following machine data must be checked and corrected if necessary afterloading the series startup:● MD30250 $MA_ACT_POS_ABS (internal encoder position)● MD30270 $MA_ENC_ABS_BUFFERING (traversing range extension)● MD34090 $MA_REFP_MOVE_DIST_CORR (absolute offset)● MD34210 $MA_ENC_REFP_STATE (adjustment status)● MD34220 $MA_ENC_ABS_TURNS_MODULO (Modulo range)● MD34230 $MA_ENC_SERIAL_NUMBER (encoder serial number)15.9.8 Enabling the measurement systemThe measuring system of a machine axis is activated in the following cases:● Power up of the control (POWER ON)● Activation of the measuring system via interface signal (deselection of "parking"):DB31, ... DBB1.5 / 1.6 (position measuring system 1/2)DB31, ... DBB2.1 (servo enable)● Violation of the assigned encoder limit frequency (spindles):MD36300 $MA_ENC_FREQ_LIMITWhen the measuring system is activated, the NC synchronizes the actual value system of themachine axis with the current absolute value. Traversing is disabled during synchronizationfor axes but not for spindles.R1: Referencing15.9 Referencing with absolute encodersBasic Functions1188 Function Manual, 01/2015, 6FC5397-0BP40-5BA2