Rockwell-automation 1760-DNET Pico DeviceNet Communications Module Use Manual de usuario descargar pdf (Pagina 55)

Publication 1760-UM003A-EN-P - September 2005

Application Examples for Pico 6-11

Read marker: M1 – M16/N1 – N16

Unlike the write operation, the marker read operation reads the entire

marker area of a particular marker type (M or N) is read.

Command rejected –

(3)

0 1 Len 01 01

1 2

Type

(1)

With M marker 86 86

With N marker 87 87

2 3

Index

00 – 0F 00 – 0F

3 4

Data 1 (Low Byte)

(2)

00/01 00/01

4 – 6 5 – 7 Data 2 – 4 00 00

(1) There are 16 M markers and 16 N markers. The markers are addressed by Type and Index: Use Type to select

the M or N marker. Use Index to select the marker number.

(2) The marker is set if a value is written to the data byte that does not equal zero. The marker is reset accordingly

if the value 0 is written to data byte Data 1.

(3) Possible causes page 6-34

Table 6.18 Marker M13 is Set

Byte Meaning Value (hex), sent by

Master Slave Master Slave

Attribute ID: Write 8C –

0 Response:

Write successful – C1

Command rejected –

(1)

(1) Possible causes page 6-49

0 1 Len 01 01

1 2 Type

M marker 86 86

2 3 Index 0C 0C

3 4 Data 1 01 00

4 – 6 5 – 7 Data 2 – 4 00 00

Table 6.17 Telegram Structure

Byte Meaning Value (hex), sent by

Master Slave Master Slave

1 2 ... 50 51 52 53 54 55 56 57 58 59 60 ... 167 168

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