C6-3
IM 34M06H62-02E 2nd Edition : June 2008-00
Adjusting the Proportional Band
When fine-tuning a proportional band obtained from auto-tuning, or when adjusting the
proportional band manually, note the following points.
- Always adjust downwards from a larger value to a smaller value.
- If oscillations appear, it means that the PB setting is too small.
- Adjusting the proportional band will not eliminate the offset. (Adjusting the Integral
Time (TI) and Manual Reset (MR) parameters may however eliminate the offset.)
Figure C6.4 Adjusting the Proportional Band
Table C6.2 Proportional Band Parameter
Data Position Number
Symbol Description Unit
Data Range
Default
Value
Attribute
Stored
Loop1 Loop2 Loop3 Loop4
206 406 606 806 1.PB Proportional band % 1 to 9999 (0.1 to 999.9%) 50 RW
226 426 626 826 2.PB Proportional band % 1 to 9999 (0.1 to 999.9%) 50 RW
246 446 646 846 3.PB Proportional band % 1 to 9999 (0.1 to 999.9%) 50 RW
266 466 666 866 4.PB Proportional band % 1 to 9999 (0.1 to 999.9%) 50 RW
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