Technical data

OM 1191 55
Embedded Fieldbus
Actual Value Scaling
The scaling of actual values can be protocol dependent. In
general, for Actual Values, scale the feedback integer using
the parameter’s resolution. For example:
Feedback Integer Parameter Resolution
(Feedback Integer) × (Parameter Resolution) = Scaled Value
1
0.1 mA
1 × 0.1 mA = 0.1 mA
10 0.1%
10 × 0.1% = 1%
Where parameters are in percent, the Complete parameter
descriptionssectionspecieswhatparametercorrespondsto
100%. In such cases, to convert from percent to engineering
units,multiplybythevalueoftheparameterthatdenes
100% and divide by 100%. For example:
Feedback Integer Parameter Resolution Value of the Parameter that denes 100%
(Feedback Integer) × (Parameter Resolution) × (Value of 100%
Ref.) / 100% = Scaled Value
10 0.1% 1500 rpm
1
10 * 0.1% * 1500 RPM / 100% = 15 rpm
100 0.1% 500 Hz
2
100 * 0.1% * 500 Hz / 100% = 50 Hz
1. Assuming, for the sake of this example, that the Actual Value uses parameter 9908 MOT NOM SPEED as the 100% reference, and that 9908 = 1500 rpm.
2. Assuming, for the sake of this example, that the Actual Value uses parameter 9907 MOT NOM FREQ as the 100% reference, and that 9907 = 500 Hz.
Although Actual Value scaling could differ from the above for
theN2andFLNprotocols,itcurrentlydoesnot.Toconrm,
see the following sections, as appropriate:
• N2 analog input objects in the N2 protocol technical
data section.
• Scaling drive feedback values in the FLN protocol
technical data section.
Scaling does not apply for the BACnet protocol.