PROGRAMMING MODULE #2 - SCALE BY KEY-IN METHOD
PROGRAM DECIMAL POINT POSITION
Select the desired decimal point position of the scaled display by pressing
either the “Up” or “Down” button.
Note: Whatever decimal point is selected will appear in succeeding
programming steps. Also, the “P” button must be pressed after each step to enter
the desired data and to proceed to the next step.
“ dECPNt”<>“0”
“0.0”
“0.00”
“0.000”
“0.0000”
PROGRAM ROUNDING INCREMENT AND RIGHT HAND
DUMMY ZEROS
Rounding values other than one cause the scaled number to ‘round’ to the
nearest rounding increment selected (ie. rounding of ‘5’ causes ‘122’ to round to
‘120’ and ‘123’ to round to ‘125’). If the process is inherently jittery, the display
value may be rounded to a higher value than one. This will allow the display to be
easier to read. If the range of the process exceeds the required resolution, (ex.
0-10,000 PSI, but only 10 PSI resolution required), a rounding increment of 10 will
effectively make the display more stable. This programming step is usually used in
conjunction with programmable digital filtering (Pro 4) to help stabilize display
readings. (If display stability appears to be a problem and the sacrifice in display
resolution is unacceptable, program higher levels of digital filtering or increase
the level of process dampening.) Rounding increments of 10, 20, 50, and, 100 may
also be used to add “dummy zeros” to the scaled readings, as desired.
“round”< > “1”
“2”
“5”
“10”
“20”
“50”
“100”
At this stage a choice of either return to “Pro 0” or continue with scaling of the
display is offered.
“SCALE” < > “yES”
“NO”
If “YES” was selected for the previous step, the scaling procedure is started. In
order to scale the indicator, two signal level values and two display values that
correspond to the signal values must be known. These four values are directly
entered into the indicator. An example of a signal-display pair is listed below:
3.000 PSI @ 4.000 mA AND 15.000 PSI @ 20.000 mA
Scaling point #1 Scaling point #2
Note that reverse acting indication can be accomplished by either reversing
the two signal points or the display value points, but not both. If both are reversed,
then forward (normal) acting indication will occur. In either case, do not reverse
the input signal wires because the indicator was designed to accept positive
signals only. With this scaling procedure, both the display values and signal
values are keyed in.
KEY-IN DISPLAY VALUE FOR SCALING POINT #1
“dSP 1” < > “-99999” to “99999” (ex. 3.000 PSI)
KEY-IN SIGNAL VALUE FOR SCALING POINT #1
“INP 1” < > “0-50” (ex. 4.000)
KEY-IN DISPLAY VALUE FOR SCALING POINT #2
“dSP 2” < > “-99999” to “99999” (ex. 15.000 PSI)
-8-
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