Siemens SINUMERIK 840D Function Manual page 227

Mc axes and spindles

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Feedback signal, activation of the traversing range limits

The feedback signal that the traversing range limits of a 360° modulo rotary axis are active in

the NC, is realized using the axis-specific NC/PLC interface signal:

DB31, ... DBX74.4 == 1 (modulo rotary axes: traversing range limits active)

Example: Changing the traversing range limits

Pallet 1 with several clamped workpieces is machined on a 360° modulo rotary axis. The pallet

1 is then swapped for a pallet 2 with a built-on axis. The traverse range now has to be monitored.

Parameterization:

● MD30300 $MA_IS_ROT_AX[ AX5 ] = 1

● MD30310 $MA_ROT_IS_MODULO[ AX5 ] = 1

● MD36110 $MA_POS_LIMIT_PLUS[ AX5 ] = 340

● MD36100 $MA_POS_LIMIT_MINUS[ AX5 ] = 350

Extract from part program:

Program code

G1 X0 Y300 Z500 B0 F5000

CYCLE84(500,400,0,350,0,1,4,10,,0,500,1000) ; drilling cycle

Axes and spindles

Function Manual, 06/2019, A5E47437747B AA

Direction of rotation +/-

Software limit switch +/-

360° modulo rotary axis with software limit switch

; Insert pallet 1 with quadruple clamping

; PLC: deactivate traversing range limits of the

; B axis => DB35, DBX12.4=0

; Trigger a preprocessing stop

R2: Rotary axes

7.2 Modulo 360 degrees

Sinumerik 840d sl