Siemens SINUMERIK Series Function Manual

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N3: Software cams, position switching cycles - only 840D sl8.3 Output of cam signalsExtended Functions548 Function Manual, 03/2013, 6FC5397-1BP40-3BA1Hardware assignmentThe assignment to the hardware bytes used is made for each eight cam pairs in the followinggeneral machine data:• MD10470 SW_CAM_ASSIGN_FASTOUT_1 Hardware assignment for output of cams1 - 8 to NCK I/Os• MD10471 SW_CAM_ASSIGN_FASTOUT_2 Hardware assignment for output of cams9 - 16 to NCK I/Os• MD10472 SW_CAM_ASSIGN_FASTOUT_3 Hardware assignment for output of cams17 - 24 to NCK I/Os• MD10473 SW_CAM_ASSIGN_FASTOUT_4 Hardware assignment for output of cams25 - 32 to NCK I/OsNoteIt is possible to define one HW byte for the output of eight minus cam signals and one HWbyte for the output of eight plus cam signals in each machine data.In addition, the output of the cam signals can be inverted with the two machine data.If the 2nd byte is not specified (= "0"), then the 8 cams are output as a logic operation of theminus and plus cam signals via the 1st HW byte using the 1st inversion screen form.Status query in the part programThe status of the HW outputs can be read in the part program with main run variable$A_OUT[n] (n = no. of output bit).Switching accuracySignals are output to the NCK I/Os or onboard outputs in the position control cycle.As a result of the time scale of the position control cycle, the switching accuracy of the camsignals is limited as a function of the velocity.The following applies:Delta pos = Vact * position control cycleDelta pos = switching accuracy (depending on position control cycle)with:Vact = Current axis velocityExample:Vact = 20 m/min, PC cycle = 4 ms Delta pos = 1.33 mmVact = 2000 rpm, PC cycle = 2 ms Delta pos = 24 degrees