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Rockwell Automation 1794-APB/B FLEX I/O PROFIBUS Adapter Module User Manual User Manual

Page 33

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2–13

How Communication Takes Place and I/O Image Table Mapping

Publication 1794ĆUM057B-EN-P - November 2001

1794ĆOA8 - 8Ćpoint Discrete Output Module Image Table Mapping

Module Image

Outputs

I/O Image

Not used

Not used

Not used

Input Size

Output Size

0 or 1 Word

1 or 2 Words

Read

Write

1794ĆOA8 Memory Map

Decimal Bit

15

14

13

12

11

10

09

08

07

06

05

04

03

02

01

00

Size

Oct. Bit

17

16

15

14

13

12

11

10

07

06

05

04

03

02

01

00

Read Words

Not used

Read Word 1

Not used

O7

O6

O5

O4

O3

O2

O1

O0

WriteWord 1

Not used

WriteWord 2

Where O = Output value (where O0 corresponds to output 0, O1 corresponds to output 1, etc.)

1794ĆOW8 - 8Ćpoint Discrete Relay Output Module Image Table

Mapping

Module Image

Outputs

I/O Image

Not used

Not used

Not used

Input Size

Output Size

0 or 1 Word

1 or 2 Words

Read

Write

1794ĆOW8 Memory Map

Decimal Bit 15

14

13

12

11

10

09

08

07

06

05

04

03

02

01

00

Size

Oct. Bit

17

16

15

14

13

12

11

10

07

06

05

04

03

02

01

00

Read Words

Not used

Read Word 1

Not used

O7

O6

O5

O4

O3

O2

O1

O0

WriteWord 1

Not used

WriteWord 2

Where O = Output value: where O0 corresponds to output 0, O1 corresponds to output 1, etc., and when bit = 0, the output is off; when bit = 1, the output is on.