Siemens CNC Milling | TRANS and ATRANS | Programmable Work Offset

In this article, we describe how to use programmable work offset function in Siemens CNC controlled milling (machine centre) machines with all details and examples. 

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Programmable Work Offset Introduction

The programmable work offset can be used as below in Siemens CNC controller;

  • for recurring shapes/arrangements in various positions on the workpiece
  • when selecting a new reference point for the dimensioning
  • as a stock allowance when roughing

This results in the current workpiece coordinate system. The rewritten dimensions use this as a reference. The offset is possible in all axes.

TRANS and ATRANS Codes Format

TRANS X… Y… Z… ; programmable offset, deletes old instructions for offsetting, rotation, scaling factor, mirroring
ATRANS X… Y… Z… ; programmable offset, additive to existing instructions
TRANS ; Without values: Clears old instructions for offset, rotation, scaling factor, mirroring

The instructions which contain TRANS or ATRANS each require a separate block.

You may be interested also:
“Siemens CNC | MCALL code | Cycle Repeat”

See the following illustration for the example for programmable offset:

Programmable Work Offset Examples

TRANS CNC Program Example – 1

N20 TRANS X20 Y15 ; Programmable offset
N30 L10 ; Subroutine call; contains the geometry to be offset
N70 TRANS ; Offset cleared


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