Allen-Bradley Compact I/O 1769-ADN DeviceNet, User Manual

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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.
Wo
rd
Bit Position
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
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 O0 U1 O1 U2 O2 U3 O3 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.
Wo
rd
Bit Position
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 0 0 0 0 r r r r r r r r r r r r
r = read
Wo
rd
Bit Position
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 r r r r r r r r r r r r r r r r
r = read