Rockwell Automation 6008-SV2R VMEbus remote I/O Scanner - Manual (Page 33)

Chapter
Addressing I/O
3
3Ć4
8Ć and 16Ćpoint examples
1Ćslot addressing
(1 I/O chassis slot = 1 I/O group = 1 input image word and 1 output
image word = 16 input bits and 16 output bits.)
0
1
2
3
4
5
6
7
Output Image Table
Word #
0
1
2
3
4
5
6
7
Input Image Table
Word #
ЙЙЙЙЙ
ЙЙЙЙЙ
scanner memory
Rack x
00 17 bits
00 17 bits
00
01
02
03
04
05
06
07
10
11
12
13
14
15
16
17
Input
Terminals
Input
Terminals
An 8Ćpoint I/O module occupies
8 bits in a word. See ➀
00
01
02
03
04
05
06
07
Input
Terminals
Input
Terminals
Two 8Ćpoint input modules occupy 8
bits of each group. See ➁
ЙЙЙЙЙ
ЙЙЙЙЙ
➀
➁
00
01
02
03
04
05
06
07
Input
Terminals
Output
Terminals
An 8Ćpoint input module in group 4
occupies the first 8 bits of input word
4. The 8Ćpoint output module
occupies the first 8 output bits in
output word 5. See ➂
ЙЙЙЙЙ
ЙЙЙЙЙ
ЙЙЙЙЙ
➂
➂
ЙЙЙЙЙ
ЙЙЙЙЙ
Group 2 Group 3
Group 4 Group 5 Group 6 Group 7
ЙЙЙЙЙЙЙЙЙ
ЙЙЙЙЙЙЙЙЙ
ЙЙЙЙЙЙЙЙЙ
ЙЙЙЙЙЙЙЙЙ
16Ćpoint I/O modules occupy 16 bits,
an entire word, in the image table.
See ➃
➃
➃
Group 0
00
01
02
03
04
05
06
07
10
11
12
13
14
15
16
17
00
01
02
03
04
05
06
07
10
11
12
13
14
15
16
17
Input
Terminals
Output
Terminals
00
01
02
03
04
05
06
07
00
01
02
03
04
05
06
07
0 1 2 3
4 5 6 7