Rockwell-automation 1769-ADN Compact I/O 1769-ADN DeviceNet Adapter Manual de usuario descargar pdf (Pagina 30)

Publication 1769-UM001B-EN-P - October 2002

2-6 How Communication Takes Place and I/O Image Table Mapping

1769-IF4 (Series A and B)

Analog Current/Voltage

Input Module (4 Channel)

Input Data

For each 1769-IF4 input module, input data words 0-3 contain the

analog value of the inputs. Word 4 and 5 contain analog status and

error information.

1769-IM12 240V AC Input

Module (12 Point)

Input Data

For each 1769-IM12 input module, input data word 0 contains the

current state of the field input points. Bits 12 to 15 are not used.

1769-IQ16 24V DC

Sink/Source Input Module

(16 Point)

Input Data

For each 1769-IQ16 input module, input data word 0 contains the

current state of the field input points.

Word

Bit Position

15 14131211109876543210

0 SGN Analog Input Data Channel 0

1 SGN Analog Input Data Channel 1

2 SGN Analog Input Data Channel 2

3 SGN Analog Input Data Channel 3

4 Not Used S3 S2 S1 S0

5 U0 O0U1O1U2O2U3O3 Set to 0

SGN= sign bit in two’s format

Sx = general status bit for channels 0 through 3. This bit is set (1) when an error (over- or

under-range) exists for that channel.

Ux = under-range flag bits for channels 0 through 3. These bits can be used in the control

program for error detection.

Ox = over-range flag bits for channels 0 through 3. These bits can be used in the control

program for error detection.

Word

Bit Position

1514131211109876543210

0 0 0 0rrrrrrrrrrrr

r = read

Word

Bit Position

1514131211109876543210

0rrrrrrrrrrrrrrrr

r = read

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 203 204

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Rockwell-automation 1769-ADN Compact I/O 1769-ADN DeviceNet Adapter Manual de usuario Pagina 30

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