Rockwell Automation 1746-BTM Barrel Temperature Control Module User Manual - Manual (Page 45)

Publication 1746-UM010B-EN-P - April 2001
Setting Autotune and Gains Values 4-5
Entering Autotune/Gains
Values with Implied
Decimal Point The autotune/gains block (M0 file) contains 49 words as listed in
Table 4.A below. For each gain value, you enter a 16–bit integer
value.
When entering or reading integer values, the range, given in the
associated table, tells you the implied decimal point. It is the number
of digits to the right of the decimal point (for an example range of 0.0
thru 3276.7, the implied decimal point is 1).
IMPORTANT
Because loop values are stored and reported in
integer files, you must understand the meaning of
IDP. Otherwise, the magnitude of your intended
value may be in error by as much as 1000,
depending on the position of the IDP.
Table 4.A Autotune/Gains Values with Implied Decimal Point
Parameter Given Range
IDP
(1) Example
Cool Time Constant 0.0 thru 32767.7 sec. 1 If you want to store a value of 660.0, enter 06600.
Heat Gain
0.00 thru 327.67 o /sec.
2 If you want to store a value of 100.00, enter 10000.
Cool Proportional 0.000 thru 32.767 3 If you want to store a value of 18, enter 18000.
Heat Integral 0.0000 thru 3.2767 4 If you want to store a value of 0.5, enter 05000.
(1)
IDP indicates the number of digits from the right that locates the implied decimal point.