Rockwell-automation 1746-NI16V SLC 500 Analog Input Modules User Manua User Manual download pdf (Page 112)

Publication 1746-UM001A-US-P

Glossary 2

is enabled and there are no channel errors. When the channel is

disabled, the channel data word is cleared (0).

digital filter - A filter implemented in firmware, using discrete,

sampled data of the input signal.

filter - A device that passes a signal or range of signals and eliminates

all others.

filter frequency - (-3 dB frequency) The user-selectable frequency.

full scale error - (gain error) The difference in slope between the

actual and ideal analog transfer functions.

full scale range - (FSR) The difference between the maximum and

minimum specified analog input values.

gain drift - The change in full scale transition voltage measured over

the operating temperature range of the module.

input data scaling -The data formats that you select to define the

logical increments of the channel data word. These may be

scaled-for-PID, or Engineering Units, which are automatically scaled.

They may also be proportional counts, which you must calculate to fit

the resolution of the quantity being measured in your application.

input image - The input from the 1746-NI16 module to the SLC500™

processor. The input image contains the module data words and status

words.

local configuration - A control system where all the chassis are

located within several feet of the processor, and chassis-to-chassis

communication is via a 1746-C7 or 1746-C9 ribbon cable.

LSB - (Least Significant Bit) The bit that represents the smallest value

within a string of bits.

module scan time - same as module update time

module update time - The time required for the module to sample

and convert the input signals of all enabled input channels and make

the resulting data values available to the SLC500 processor.

multiplexer - An switching system that allows several input signals to

share a common A/D converter.

normal mode rejection - (differential mode rejection) A logarithmic

measure, in dB, of a device’s ability to reject noise signals between or

among circuit signal conductors.

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Rockwell-automation 1746-NI16V SLC 500 Analog Input Modules User Manua User Manual Page 112