Delta MMC120 - Manual (Page 93)

DCS120 Diagnostic and Setup Program User Notes
Delta Computer Systems, Inc. 360/254-8688 93
User Notes
Negative Offset
DCS120 displays both positive and negative numbers in the position, extend limit, and retract limit fields. The way
position and limit fields are displayed is determined by the offset field. Most applications requiring an offset use a
negative offset. The rule is: all numbers between the negative offset and 0 are displayed as negative numbers.
Example:
OFFSET 0 position range 0 to 65535 (65536 total steps)
OFFSET -1000 position range -1000 to 64535
OFFSET -6000 position range -6000 to 59535
OFFSET -10000 position range -10000 to 55535
OFFSET -20000 position range -20000 to 45535
OFFSET -30000 position range -30000 to 35535
For any negative offset, values greater than the maximum position but less than the maximum number of steps are
treated and displayed as negative numbers:
OFFSET -30000 position range -30000 to 35535 (65536 total steps)
A position request of 45000 is displayed as: 45000 - 65536 = -20536
View Data Command
The View Data command (Ctrl-V) displays raw Counts, Target, Status, and time information. (Speed values are
calculated by DCS120.)
Sum of Errors Squared (
ÿ
e
2
)
A sum of errors squared term is included on the top line of the plot screen. You can use this term by noting if it’s
getting smaller or larger as you change parameters; the smaller the number the better-tuned the axis. Repeat the tuning
steps in the MMC120 manual using the same profile terms until you get the lowest number.