Bradley Smoker PLC-5 point Example, Input, Termi, Nals, 4Addressing I/O and Controller Memory

4-4Addressing I/O and Controller Memory

18-and 16-point Example

0 1

	1-slot addressing (1 I/O chassis slot = 1 I/O group = 1 input image
2 3	word and 1 output image word = 16 input bits and 16 output bits.)

Input	Input
Terminals	Termi
00	nals 10
01	11
02	12
03	13
04	14
05	15
06	16
07	17

Group 0

An 8-point I/O module occupies 8 bits in a word. See 1

4 5

Input	Input
Terminals	Terminals
00	00
01	01
02	02
03	03
04	04
05	05
06	06
07	07
Group 2	Group 3

Two 8-point input modules occupy 8 bits of each group. See 2

6 7

Controller memory

Rack x

Word #		Output Image Table
	0
	1
	2
	3
	4
3	5
	6

47

17 00 bits

Input Image Table

Word #

1 0

1

2

2 3

3 4

5

46

7

17 00 bits

Input	Output
Terminals	Terminals
00	00
01	01
02	02
03	03
04	04
05	05
06	06
07	07

Input	Output
Terminals	Terminals
00	00
01	01
02	02
03	03
04	04
05	05
06	06
07	07
10	10
11	11
12	12
13	13
14	14
15	15
16	16	If you were to address the device attached to
17	17

this output circuit in your control program, the address would be O:xx7/17.

Group 4 Group 5

An 8-point input module in group 4 occupies the first eight bits of input word 4. The 8 point output module occupies the first 8-output bits in output word 5. See 3

Group 6 Group 7

16-point I/O modules occupy 16 bits, an entire word, in the image table. See 4

Publication 1785-UM012D-EN-P - July 2005