Rockwell-automation 1746-NI8 SLC 500 Analog Input Modules User Manual Instrukcja Użytkownika Pobierz pdf (Strona 47)

5–6

Channel Configuration, Data, and Status

Publication

17466.8 - April 1997

Channel Data Word Values for Scaled Data

Input Type Signal Range ScaledforPID Proportional Counts (default) NI4 Data Format

±10V dc

-10.00V to +10.00V 0 to 16383 -32768 to 32767 -32768 to 32767

0-5V dc 0.0V to +5.00V 0 to 16383 -32768 to 32767 0 to 16384

1-5V dc +1.00V to +5.00V 0 to 16383 -32768 to 32767 3277 to 16384

0-10V dc 0.0V to +10.00V 0 to 16383 -32768 to 32767 0 to 32767

0-20 mA 0.0 mA to 20.0 mA 0 to 16383 -32768 to 32767 0 to 16384

4-20 mA 4.0 mA to 20.0 mA 0 to 16383 -32768 to 32767 3277 to 16384

±20 mA

-20.0 mA to 20.0 mA 0 to 16383 -32768 to 32767 -16384 to 16384

0-1 mA 0.0 mA to 1.00 mA 0 to 16383 -32768 to 32767

0 to 1000

➀

This

data format is not supported by the 1746NI4 module, but is available for the 1746NI8 module.

This section provides descriptions of how the data types are

expressed in the channel data word and examples of how to

mathematically convert the data.

Data Type Descriptions

The engineering units are 1 mV/step for voltage input types, and

1.0 µA/step for current input types.

The scaled-for-PID value is a 14-bit unsigned integer, with 0

representing the low scale value and 16,383 representing the full

scale value minus 1 lsb. The input signal range is proportional to

your selected input type and scaled into a 0–16,383 range, which is

standard to the SLC PID algorithm.

The proportional count value is a 16-bit signed integer. The input

signal range is proportional to your selected input and scaled into a

–32,768 to 32,767 range.

The 1746-NI4 data format converts the current and voltage signals

into 16-bit 2’s complement binary values. The table below identifies

the current and voltage input ranges for the input channels, the

number of significant bits, and the resolution.

Voltage/Current Range Decimal

Representation

Number of

Significant Bits

Resolution

per LSB

-10V dc to +10V dc - 1LSB -32,768 to +32,767 16 bits

0 to 5V dc 0 to 16,384 14 bits

305 176 V

1 to 5V dc 3,277 to 16,384 13.67 bits

305.176 uV

0 to 10V dc - 1LSB 0 to 32,767 15 bits

Scaling the

Channel Data Word

1 2 ... 42 43 44 45 46 47 48 49 50 51 52 ... 90 91

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