©Contrinex 2013 - JDCPPT_LF_Fieldbus

Fieldbus

J.-D. Chatelain

Fieldbus

Master

1 1

2 2

3 3

Interface 1

RWM 1 RWM 2 RWM 3 RWM 4

1 1

RWM 1

Interface 2

2 2

RWM 1

Interface 3

RWM 3 RWM 4 RWM 2

3 3

Power supply

Fieldbus

Master

1 1

2 2

3 3

Interface 1

RWM 1 RWM 2 RWM 3 RWM 4

1 1

RWM 1

Interface 2

2 2

RWM 1

Interface 3

RWM 3 RWM 4 RWM 2

3 3

Power supply

Fieldbus

Master

1 1

2 2

3 3

Interface 1

RWM 1 RWM 2 RWM 3 RWM 4

1 1

RWM 1

Interface 2

2 2

RWM 1

Interface 3

RWM 3 RWM 4 RWM 2

3 3

Power supply

Fieldbus

Master

1 1

2 2

3 3

Interface 1

RWM 1 RWM 2 RWM 3 RWM 4

1 1

RWM 1

Interface 2

2 2

RWM 1

Interface 3

RWM 3 RWM 4 RWM 2

3 3

Power supply

©Contrinex 2013 - JDCPPT_LF_Fieldbus

Example:Read 4 words from address 10

J.-D. Chatelain

X

X

"R"

"D"

0

10

4

Power supply

Fieldbus

New command

X

X

X

Lire 4 mots à partir de l'adresse 10

0 0 1 0 0 RWM2

Read

Tag EM4056

From address 10

4 words

irrelevant

RWM2

No interface error

No RWM error

irrelevant

No data

01

Tags in front of RWM1 and RWM2Acknowledgment

PHASE 1Master

RWM 1

0

2

0

0

0 0 10 11 00 11

RWM 2 RWM 3 RWM 4

Slave

Command completed

X

X

"R"

"D"

0

10

4

Power supply

Fieldbus

X

X

X

Lire 4 mots à partir de l'adresse 10

0 0 1 0 0

RWM 1

0

2

0

0

0 0 10 11 00 11

RWM 2 RWM 3 RWM 4

Slave

01

irrelevant

Understood, end of communication

irrelevant

PHASE 1Master

Number of words

Power supply

Fieldbus

New command

Data + protections

Lire 4 mots à partir de l'adresse 10

0 0 1 0 0 01

"R"

"P"

RWM2

Reply

irrelevant

RWM2

No interface error

No RWM error

Data

RWM 1 RWM 2 RWM 3 RWM 4

Slave

6

2

0

0

0 0 10 11

DATA 2 (début)

00Tags in front of RWM1 and RWM2Releasing of data1

DATA 1

0

X

X

X

1 0

0

10

4

X

X

"R"

"D"

PHASE 2Master

61

0

10

4

X

X

Waiting next data

Lire 4 mots à partir de l'adresse 10

0 0 1 0 0 1

"R"

"P"

irrelevant

Data

RWM 1 RWM 2 RWM 3 RWM 4

Slave

0 0 10 11

DATA 2 (beginning)

DATA 1

1 0

1

DATA 2 (continuation)

2

0

0

DATA 3

DATA 4

Protection 1

Protection 2

1Releasing of data

PHASE 2Master

Power supply

Fieldbus

Power supply

Fieldbus

0

10

4

X

X

Data are read

Lire 4 mots à partir de l'adresse 10

0 0 1 0 0 1

"R"

"P"

irrelevant

irrelevant

RWM 1 RWM 2 RWM 3 RWM 4

Slave

0 0 10 11 1 0

1

DATA 2 (continuation)

DATA 3

DATA 4

Protection 2

1Waiting an instruction

Protection 1

PHASE 2Master

Power supply

Fieldbus

0

10

4

X

X

Waiting next data

Lire 4 mots à partir de l'adresse 10

0 0 1 0 0 1

"R"

"P"

irrelevant

Data

RWM 1 RWM 2 RWM 3 RWM 4

Slave

0 0 10 11 1 0

1

DATA 2 (suite)

DATA 3

DATA 4

Protection 4

1Releasing of dataProtection 3

Protection 1

Protection 4

irrelevant

PHASE 2Master

Power supply

Fieldbus

0

10

4

X

X

Data are read

Lire 4 mots à partir de l'adresse 10

0 0 1 0 0 1

"R"

"P"

irrelevant

RWM 1 RWM 2 RWM 3 RWM 4

Slave

0 0 10 11 1 0

1

DATA 4

Protection 4

1

Protection 3

Protection 1

Protection 4

irrelevant

1All data have been sentWaiting an instruction

PHASE 2Master

Power supply

Fieldbus

0

10

4

X

X

Command completed

Lire 4 mots à partir de l'adresse 10

0 0 1 0 0 1

"R"

"P"

irrelevant

RWM 1 RWM 2 RWM 3 RWM 4

Slave

0 0 10 11 1 0

DATA 4

Protection 4

Protection 3

Protection 1

Protection 4

irrelevant

1End of transaction

0

0

PHASE 2Master

©Contrinex 2013 - JDCPPT_LF_Fieldbus

Fieldbus

J.-D. Chatelain

End of this chapter