Fieldbus Coupler/Controller • 49
Fieldbus Coupler 750-306
3.1.5.3 Addressing
3.1.5.3.1 Fieldbus Specific
Once the supply voltage is applied, the Assembly Object maps data from the process image. As soon as a connection is established, a DeviceNet-Master (Scanner) can address and access the data by "Class", "Instance" and "Attribute".
Data mapping depends on the selected Assembly Instance of the static Assembly.
Further information
The Assembly Instances of the static Assembly are described in chapter 5.5.1.1 "Assembly Instance".
fieldbus master
Fieldbus coupler
memory area for input data
word 0 |
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I/O modules |
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Assembly |
Application |
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Producer |
Input- |
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Assemly |
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word 255 |
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memory area |
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Consumer |
Output- |
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for output data |
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I O
word 255
Fig. 3-1: Fieldbus specific data exchange for a DeviceNet fieldbus Coupler |
g012531e |
Note
For the number of input and output bits or bytes of the individual I/O modules, please refer to the corresponding I/O module description.
Note
A process image restructuring may result if a node is changed or extended. In this case the process data addresses also change in comparison with earlier ones. In the event of adding a module, take the process data of all previous modules into account.
WAGO-I/O-SYSTEM 750
DeviceNet
50 • Fieldbus Coupler/Controller
Fieldbus Coupler 750-306
Example for static assembly (default assembly):
The default assembly is: |
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Output1 |
(I/O Assembly Instance 1) |
Input1 |
(I/O Assembly Instance 4) |
In this example, the fieldbus node arrangement looks like this:
1)1 fieldbus coupler DeviceNet (750-306),
2)1 digital 4-channel input module (i. e. 750-402),
3)1 digital 4- channel output module (i. e. 750-504),
4)1 analog 2- channel output module with 2 bytes per channel (i. e. 750-552),
5)1 analog 2- channel input module with 2 bytes per channel (i. e. 750-456),
6)1 End module (750-600).
Input process image:
Default process data, input image (Assembly Class, Instance 4)
Byte |
.7 |
.6 |
.5 |
.4 |
.3 |
.2 |
.1 |
.0 |
0 |
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low byte channel 1 |
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1 |
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high byte channel 1 |
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2 |
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low byte channel 2 |
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3 |
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high byte channel 2 |
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4 |
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not used |
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DI041) |
DI031) |
DI021) |
DI011) |
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5 |
DS08 2) |
DS07 2) |
DS06 2) |
DS05 2) |
DS04 2) |
DS03 2) |
DS02 2) |
DS01 2) |
1)DI = Digital Input
2)DS = Diagnostic Status
Output process image:
Default process data, output image (Assembly Class, Instance 1)
Byte |
.7 |
.6 |
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.5 |
.4 |
.3 |
.2 |
.1 |
.0 |
0 |
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low byte channel 1 |
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1 |
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high byte channel 1 |
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2 |
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low byte channel 2 |
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3 |
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high byte channel 2 |
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4 |
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not used |
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DO041) |
DO031) |
DO021) |
DO011) |
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1) DO = Digital Output
WAGO-I/O-SYSTEM 750
DeviceNet