Delta MMC120 - Manual (Page 112)

112
Since the scale is less than 16383.5, use the Prescale Divisor bits in the
CONFIGURATION WORD to divide the transducer counts by 8. Then multiply
the scale by 8 to obtain:
SCALE = 3802.22 x 8 = 30418
OFFSET
Default: 0
Range: -65536 to 65535
TIP: From the Tools menu, select Scale/Offset Calibration to help calculate
SCALE and OFFSET.
OFFSET is used to shift the ACTUAL POSITION with respect to the transducer zero.
The OFFSET is specified in Position Units and is equal to the desired ACTUAL
POSITION at zero TRANSDUCER COUNTS . It is defined as:
OFFSET = P0 - (P0 - P1) x C0
(C0 - C1)
CAUTION: When using OFFSET, you must be familiar with the limitations of 16-bit
math. These are described in Valid 16-bit Positions .
Why Bother?
The OFFSET can be used to set your 0 point anywhere along the axis.
What if it is displayed under the monitor program incorrectly?
The OFFSET may be displayed incorrectly on the monitor main screen under some
circumstances. This is because the offset specifies the zero location of the axis. The
numbers are not necessarily incorrect (the module still functions correctly), but they may
not look right. To correct the problem, enter the correct value for the OFFSET and save
the parameters to a file (using the Save As… item from the File menu). Whenever you
start the monitor program, read the parameters from the monitor and the problem should
be corrected. Each time the monitor program is started, your last-opened board file will
be opened, automatically correcting the problem.
EXTEND LIMIT
Default: Current position on power-up
Range: Valid 16-bit Position
The EXTEND LIMIT specifies the maximum requested position value that the motion