Rockwell-automation 1746-NI8 SLC 500 Analog Input Modules User Manual Manual do Utilizador descarregar pdf (Página 43)

5–2

Channel Configuration, Data, and Status

Publication

17466.8 - April 1997

The channel configuration word consists of bit fields, the settings of

which determine how the channel will operate. See the chart below

and the descriptions that follow for configuration information.

Appendix B contains a configuration worksheet.

After determining the configuration for each channel, follow the

steps outlined in chapter 2, Quick Start, or in chapter 6, Ladder

Logic Configuration Examples, to enter this configuration data into

your ladder program and copy it to the 1746-NI8 module.

Channel Configuration Word (O:e.0 through O:e.11) - Bit Definitions

Bit(s)

Define

To Select

➀

Make these bit settings in the Channel Configuration Word

Bit(s) Define

To Select

➀

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

SET

10V dc 0 0 0

SET

DIP

SWITCH



OFF

1-5V dc 0 0 1

O OFF"

FOR VOL

TAGE

0-5V dc 0 1 0

Input Type

FOR

VOL

TAGE

INPUT

0-10V dc 0 1 1

0-2 Input Type

SET

0-20 mA 1 0 0

SET

DIP

SWITCH



4-20 mA 1 0 1

O ON"

FOR CURRENT

INPUT

20 mA 1 1 0

FOR

CURRENT

INPUT

0-1 mA 1 1 1

Engineering Units 0 0 0

ScaledforPID 0 0 1

Proportional Counts 0 1 0

Data Format

1746NI4 Data Format 0 1 1

3-5 Data Format

User Defined (Class 3) 1 0 0

User Defined (Class 3) 1 0 1

Illegal (configuration error)

Zero 0 0

6 and 7

Open Circuit

Upscale 0 1

6 and 7 Open Circuit

Downscale 1 0

Illegal

No Filter 0 0 0

75 Hz 0 0 1

50 Hz 0 1 0

810

Filter

20 Hz 0 1 1

8-10

Filter

Frequency

10 Hz 1 0 0

5 Hz 1 0 1

2 Hz 1 1 0

1 Hz 1 1 1

Channel

Channel Disabled 0

Channel

Enable

Channel Enabled 1

12-15 Unused

Unused

➁

0 0 0 0

➀

addition to programming the configuration word, you must also use the DIP switches to select voltage or current.

➁

Ensure unused bits 12-15 are always be set to zeros.

Channel Configuration

Procedure

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 90 91

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