Rockwell-automation 1746-NI8 SLC 500 Analog Input Modules User Manual Bedienungsanleitung PDF herunterladen (Seite 46)

5–5

Channel Configuration, Data, and Status

Publication

17466.8 - April 1997

While the channel enable bit is cleared (0), the channel data word

and status word values are cleared. After the channel enable bit is

set, the channel data word and status word remain cleared until the

module sets the channel status bit (bit 11) in the channel status word.

(Refer to Channel Status on page 5–11.)

Unused Bits (Bits 12-15)

Bits 12–15 are not defined. Ensure these bits are always set to zero.

The module input image uses 8 data word values whether the module

is in Class 1 or Class 3 mode. The converted voltage or current input

data values reside in I:e.0 through I:e.7 of the module’s input image

file. When an input channel is disabled, its data word is reset to

zero.

1746NI8 Module Input Image - Data Word

Class 1 Class 3

I:e.0 channel 0 data word 16 bit integer

• •

I:e.1 channel 1 data word 16 bit integer

• •

I:e.2 channel 2 data word 16 bit integer

• •

I:e.3 channel 3 data word 16 bit integer

• •

I:e.4 channel 4 data word 16 bit integer

• •

I:e.5 channel 5 data word 16 bit integer

• •

I:e.6 channel 6 data word 16 bit integer

• •

I:e.7 channel 7 data word 16 bit integer

• •

The channel data word contains a 16-bit integer that represents the

value of the analog input channel. The tables below show the

channel data word values for various input types and data formats.

The second table shows the default full-scale values for the

proportional counts data format. The table does not imply the entire

data value range is usable resolution.

Channel Data Word Values for Engineering Units

Input Type Signal Range Engineering Units Engineering Units Scale

±10V dc

-10.25V to +10.25V -10250 to +10250 1mV/step

0-5V dc -0.5V to +5.5V -500 to +5500 1mV/step

1-5V dc +0.5V to +5.5V +500 to +5500 1mV/step

0-10V dc -0.5V to +10.25V -500 to +10250 1mV/step

0-20 mA -0.5 mA to 20.5 mA -500 to 20500 1.0uA/step

4-20 mA 3.5 mA to 20.5 mA 3500 to 20500 1.0uA/step

±20 mA

-20.5 mA to 20.5 mA -20500 to 20500 1.0uA/step

0-1 mA -0.05 mA to 1.05 mA -50 to 1050 1.0uA/step

Channel Data Word

1 2 ... 41 42 43 44 45 46 47 48 49 50 51 ... 90 91

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