Programming Of Rotary Axes; General Information - Siemens SINUMERIK 840D Function Manual

Mc axes and spindles

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R2: Rotary axes

7.3 Programming of rotary axes

Program code

Programming of rotary axes

General information about programming, see:

Further information:

Programming Manual Fundamentals

Axis-specific machine data

MD30310 ROT_IS_MODULO (modulo conversion for rotary axis)

is used to define whether the rotary axis behaves as a linear axis during programming and

positioning or whether rotary-axis special features are taken into account.

These features and any differences (mainly with respect to absolute programming) are

explained on the following pages.

Modulo conversion for rotary axes and spindles

MD30310 "Modulo conversion for rotary axes and spindles"

MD30320 "Modulo display for rotary axes and spindles"

If MD30310 and MD30320 are set to "1", the change in Operate to a modulo display takes place

as soon as the actual value display changes between 0° and 359.999° - or exceeds 359.999°

in the positive direction of rotation, or falls below 0° in the negative direction of rotation.

For internal setpoint and actual values, the behavior of rotary axes and spindles differ:

● For spindles, the modulo conversion takes place for each spindle programming (M3, M4 and

● For rotary axes, the modulo conversion only takes place with a new traversing command.

If the setpoint and actual values are read out, these are the same as the display values in the

"Service overview" - "Service axis" under the selected axis. For rotating spindles or rotary axes,

these values can also lie below the modulo range of 0° to 359,999°

; Insert pallet 2 with built-on axis

; PLC: activate traversing range limits of the

; B axis => DB35, DBX12.4=1

; Trigger a preprocessing stop

Axes and spindles

Function Manual, 06/2019, A5E47437747B AA

Sinumerik 840d sl