Instrumentation
Allen-Bradley analog raw counts and engineering-unit scaling
Identify the actual Allen-Bradley module data representation before scaling raw integer counts, floating-point channel data, alarms, and overrange indicators.
- Product
- ControlLogix and CompactLogix analog I/O
- Level
- Intermediate
- Read time
- 11 min
- Reviewed
- 2026-07-15
What to establish before troubleshooting
Allen-Bradley analog modules do not all share one universal raw range. The selected module, series, input range, and data format determine whether the controller receives engineering units, floating point, or integer counts.
Start with the module-defined tag and current configuration rather than assuming 0-32767, 6241-31206, or another value copied from a different module.
Abbreviated worked example
Check a nominal 0-32767 example
A documented channel maps 0 counts to 0 percent and 32767 counts to 100 percent; the observed value is 16384.
- 1Normalize: 16384 / 32767 = approximately 0.5000.
- 2Apply the 0-100 percent span.
Result: The expected value is approximately 50 percent.
Caution: This example is valid only after the installed module documentation and channel configuration confirm those endpoints.
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