Delta RMC101 User Manual download pdf (Page 552)

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101

RMC100 and RMCWin User Manual

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6.1.6 Analog Transducer Scaling

Defining the Valid 16-bit Pressure/Force/Position/Velocity Range

For general scaling information, see the Scaling Overview topic.

Because the RMC uses 16-bit words for positions, pressures, forces, and speeds, these

quantities must all fit within a range of 65,536 position units. Because the units used are user

definable, this range does not limit most applications. See the section below on defining the units

themselves.

The definition of the range of 65,536 position, pressure, force, or speed units depends on the use

of the analog channel.

For pressure and force channels, the range is fixed to that of a signed 16-bit integer: 32768 to

32767.

For position or velocity axes, the Offset and Scale parameters define the range. If the Scale

parameter is negative, then the position range extends from the Offset value minus 65535 up to

the Offset value. If the Scale parameter is non-negative, then the position range extends from the

Offset value up to the Offset value plus 65535. The following chart summarizes this concept:

Scale

Min. Position

Max. Position

< 0

Offset - 65535

Offset

³ 0

Offset

Offset + 65535

However, because the Offset is also used to convert transducer counts to position units, it cannot

be set independently. For velocity control axes or velocity reference axes, the absolute position is

typically not important, and the Offset can be set independently.

Translating to Pressure Units

For every scan the RMC makes, the Counts A status field is converted to a value for the Actual

Pressure status field. This conversion uses the Scale A and Offset A parameters plus the

Prescale Divisor bits of the Configuration word.

The following formula shows the conversion:

Translating to Force Units

For every scan the RMC makes, the Counts A and Counts B status fields are converted to the

Actual Force A and Actual Force B, which are used to calculate Actual Force. These conversions

use the Scale A, Scale B, Offset A, and Offset B parameters plus the Prescale Divisor bits of the

Configuration word.

The following three formulas show these conversions:

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