Rockwell-automation 1746-NI8 SLC 500 Analog Input Modules User Manual Manual de usuario descargar pdf (Pagina 81)

Variable Content

TTL:Chap

C–3

Publication

17466.8 - April 1997

For the 1746-NI4, input selection (voltage or current) is made via a

switch. For the 1746-NI8, input selection (voltage or current) is

made via a switch and a configuration word is used to define the

other operating parameters for the module. The 1746-NI4 does not

employ a configuration word.

To configure the 1746-NI8 for the same input type as the 1746-NI4,

use the following configuration word. For voltage input you must

select ±10V dc, and for current input you must select ±20 mA.

Define a configuration word for channels 0–7 on the 1746-NI8

module.

• Input Type

• Data Format

• Open Circuit

• Filter Frequency

• Channel Enable

• Not Used

Current Input

Voltage Input

1112131415

0000

910 8 67450123

0000

Bit Number

1100 01111000

1100 01100000

Bit Definitions for Converting from 1746NI4 to 1746NI8:

Bits 0-2

Input Type

000 = ±10V dc 110 = ±20 mA

Bits 3- 5 Data Format 011 = 1746NI4 data format

Bits 6 and 7 Open Circuit

00 = zero (the open circuit option is not available for the ±20 mA data type)

Bits 8-10 Filter Frequency 100 = 10 Hz

Bit 11 Channel Enable 0 = channel disabled 1 = channel enabled

Bits 12-15 Not Used 0000 = always make this setting

See chapter 5 for more detailed information on channel

configuration.

To convert your ladder program from the 1746-NI4s to a 1746-NI8,

you only need to change the module addressing. Change the

addresses in the program (slot and word sub element number) to

reflect the location of the new module.

See chapter 6 for more information on ladder programming.

Channel Configuration

Ladder Program

1 2 ... 76 77 78 79 80 81 82 83 84 85 86 ... 90 91

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Rockwell-automation 1746-NI8 SLC 500 Analog Input Modules User Manual Manual de usuario Pagina 81

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