Siemens 0-27648 analog scaling with NORM_X and SCALE_X
Work from Siemens analog integer representation to normalized and engineering-unit values while keeping unipolar, bipolar, overflow, and underflow ranges distinct.
- Product
- SIMATIC S7 analog I/O
- Level
- Intermediate
- Read time
- 10 min
- Reviewed
- 2026-07-15
- Author
- Toolbox editorial team
- Reviewer
- Technical review
What to establish before troubleshooting
For a typical unipolar Siemens current range, 0 to 27648 represents the nominal configured span. A common implementation normalizes that integer to 0.0-1.0 and then scales it to engineering units.
Bipolar voltage ranges and out-of-range representations use different boundaries. The exact module manual and configured measurement type remain authoritative.
Abbreviated worked example
Normalize 13824 counts
A unipolar channel is documented as 0-27648 counts for a 0-100 percent process range.
- 1Normalize: 13824 / 27648 = 0.5.
- 2Scale: 0 + 0.5 x (100 - 0).
Result: 13824 counts represents 50 percent.
Caution: Do not apply the 0-27648 assumption to a bipolar range or interpret overflow/underflow representation as valid process data.
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