Delta RMC151 - Manual (Page 883)

9 Register Reference
9.2.1.3.10. Raw Counts
Type: Axis Status Register
RMC70 Address: Primary Input: %MDn.12, where n = 8 + the axis number
Secondary Input: %MDn.27, where n = 8 + the axis number
RMC150 Address: Primary Input: %MDn.12, where n = 8 + the axis number
Secondary Input: %MDn.27, where n = 8 + the axis number
System Tag: Primary Input: _Axis[n].RawCounts
Secondary Input: _Axis[n].SecRawCounts
where n is the axis number
How to Find: Axes Status Registers Pane, All tab: Feedback
Data Type: DINT
Units: raw counts
Description
The Raw Counts register is the value read directly from the transducer. They are used to
derive the Counts, Volts or Current, which in turn are used to calculate the Actual
Position, Pressure, Force, or Velocity.
The Raw Counts are determined in the following manner for each transducer type:
• MDT
The number of MDT clock counter cycles from the start pulse to the stop pulse (or
from the beginning to the end of the PWM response). This is identical to the Counts.
• SSI
The value clocked in from the transducer.
• Analog Voltage or Current
The digital value read from the A-to-D converter. This value is then converted to Volts
or Current using the factory-set calibration values of the module.
Dual-input (differential) Force or Acceleration inputs have Channel A_Raw Counts and
Channel B_Raw Counts.
• Quadrature
Accumulated encoder counts since module power-up. Unlike the Counts status
register, this counter is never reset, and is not affected by the sign Position Scale or
Position Unwind parameter. The Raw Counts will wrap between -2,147,483,648 and
+2,147,483,647.
• Resolver
The Raw Counts are the absolute counts of the resolver. One revolution of the resolver
will give 0 to 65535 raw counts, at which point it will wrap. This is regardless of the
resolution. For 14-bit resolution, the counts will increment by 4. For 16-bit resolution,
the counts will increment by 1.
• Custom Inputs
The Raw Counts register is the Counts register rounded the nearest integer.
The Raw Counts register is a 32-bit unsigned register. However, when converted to
Counts, Volts or Current, the value is converted to a floating-point value. See the
Exceeding 24 Bits section of the Feedback Resolution topic for details on the 24-bit
limitation of the Counts register.
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