Rockwell Automation DEVICENET 1771-SDN, User Manual

Page: 127 / 139

Publication 1771-6.5.132 - June 2000
Data Map Example D-5
In 1/2-slot addressing 24 bits are available for discrete input mapping,
as shown below.
node #1 1 byte
S D
node #2 1 byte
S D
node #1 1 byte
S D
node #2 1 byte
S D
Channel A
Channel B
to node #62
to node #62
Module Status
55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40
15 0
79
95
143
159
206
222
270
81 80
2D 1D
145 144
2S 1S
208 207
2S 1S
Input Data Bits from Channel A Devices
bits 40-79
bits 80-143
Input Data Bits from Channel B Devices
bits 144-206
Status Bits from Channel A Devices
Status Bits from Channel B Devices
bits 207-270
word 0
word 1
word 2
word 3
word 4
word 5
word 6
word 7
word 8
word 9
word 10
word 11
word 12
word 13
word 14
word 15
word 16
Bit numbering in the data table is right
to left, beginning with zero.
In 1/2-slot addressing, the first 24 bits after the
module status word are used for the input
image table. This table is for discrete input bits.
Data bits for channel A node addresses 1-24 are
mapped to this area in ascending numeric order
according to node address
Device Input
Note:
D = data bit
S = status bit
1D & 1S = data and
status bits for node #1
2D & 2S = data and
status bits for node #2
208 207
2S 1S
Note: 1 word = 2 bytes
1 byte = 8 bits
Input Image Table
23 22 21 20 19 18 17 16
2D 1D
(for discrete input data bits)
39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24