Actual Pressure/Force

Type:	Axis Status Register
Address:	RMC75: Primary Input: %MDn.8, where n = 8 + the axis number Secondary Input: %MDn.23, where n = 8 + the axis number RMC150: Primary Input: %MDn.8, where n = 8 + the axis number Secondary Input: %MDn.23, where n = 8 + the axis number RMC200: Primary Input: %MDn.20, where n = 256 + the axis number Secondary Input: %MDn.80, where n = 256 + the axis number
System Tag:	Pressure Input: _Axis[n ].ActPrs, where n is the axis number Force Input: _Axis[n ].ActFrc, where n is the axis number
How to Find:	Axes Status Registers Pane, Basic tab
Data Type:	REAL
Units:	Pr or Fr

Description

The Actual Pressure or Actual Force is the measured pressure or force of the axis at any moment. This value is updated every control loop. The Actual Pressure or Actual Force may have filtering applied.

Filtering

The Actual Pressure or Force can be filtered in several different ways. The default setting is that the Actual Pressure or Force is not filtered, but filtering may be applied if the signal is excessively noisy. See the Filtering topic for details.

RMC75/150:

The Actual Pressure or Actual Force is the value after filtering has been applied.

RMC200:

The Actual Pressure or Actual Force is the final filtered value after both the control filter and display filter have been applied. The unfiltered value is given by the Actual Pressure/Force (Unfiltered) status register, and the first filtered value is given by the Actual Pressure/Force (Control) value. The control algorithm uses the Actual Pressure/Force (Control) value. Further filtering may be applied for display purposes, and the final filtered value is given by the Actual Pressure/Force register.

Calculation

The pressure or force is calculated as follows:

Pressure Input:

Voltage Input:

Actual Pressure = Voltage * Pressure Scale + Pressure Offset

Current Input:

Actual Pressure = Current * Pressure Scale + Pressure Offset

Single-Input Force:

RMC75/150:

Voltage Input:

Actual Force = Voltage * Force Scale + Force Offset

Current Input:

Actual Force = Current * Force Scale + Force Offset

RMC200:
The RMC200 includes the Voltage or Current Offset and Negative Correction Factor parameters, which are intended to be used with load cells. The Actual Force calculation is as follows:

Voltage Input (±10V, 0-10V, ±5V):

If ( ( Voltage + Voltage Offset ) < 0 ) Then

Actual Force = ( Voltage + Voltage Offset ) x Negative Correction Factor x Force Scale + Force Offset

Else

Actual Force = ( Voltage + Voltage Offset ) x Force Scale + Force Offset

EndIf

Current Input (4-20 mA, ±20 mA):

If ( ( Current + Current Offset ) < 0 ) Then

Actual Force = ( Current + Current Offset ) x Negative Correction Factor x Force Scale + Force Offset

Else

Actual Force = ( Current + Current Offset ) x Force Scale + Force Offset

EndIf