17
Node Address Settings and I/O Allocation
Section 2-2
I/O Allocation
Example
I/O data is allocated to the I/O Units in the order that they are connected to the
Communications Unit, regardless of the I/O Units’ models. Unless special
allocation data settings are selected with the Configurator, data is allocated
from the first word starting with the Communications Unit’s status flags and
then the leftmost I/O Unit’s data.
Data in the Master’s input and output areas is allocated to the Slice I/O Units
based on their unit numbers.
Note
I/O Units with bit allocation (such as the GRT1-ID4/OD4) are allocated data in
2-bit units. I/O Units with word allocation (such as the GRT1-AD2) are allo-
cated data in 1-word units. The following example shows the allocation to an
Output Unit.
Allocated Data
Patterns
The following kinds of data can be allocated in the Master. The Configurator
can be used to freely select the kinds/combination of data allocated. If the
Configurator isn’t used to select the data pattern, the default setting is used,
which is I/O data + Communications Unit status flags (pattern number 1 in the
following table).
Data Allocated to Master
Note
The Communications Unit’s status flags and Slice I/O Units’ communications
participating/withdrawn flags cannot be allocated in the output area.
+2
+3
#4
+1
Word
15
8
0
#1
#3
#2
#6
Word
15
8
0
#5
#2
ID4
#3
ID4
#4
AD2
#5
OD4
#1
ID4
#6
ROS2
Some areas may be unused
when data is allocated.
Communi-
cations
Unit
Communications Unit status
Unused
First word
First word
Unused
Output area
Input area
#2
OD4
#3
OD4
#4
ROS
2
#5
OD4
#1
OD4
#6
DA2
+1
+2
#6
+0
Word
#1
+3
#5
#2
#3
#4
#5
Communi-
cations
Unit
Data is allocated in 2-bit units
to I/O Units that require 4 bits,
so there may be unused areas
as shown in the following table.
Unused
Slice I/O Terminal configuration
15
8
0
Allocated data pattern
1
I/O data (inputs) + Communications Unit status flags
2
I/O data (inputs and outputs) only
3
Communications Unit status flags only
4
Slice I/O Unit communications participating/withdrawn flags only
Summary of Contents for SMARTSLICE - 04-2008
Page 1: ...DeviceNet Communications Unit Cat No W454 E1 03 SmartSlice GRT1 DRT OPERATION MANUAL ...
Page 2: ...SmartSlice GRT1 DRT DeviceNet Communications Unit Operation Manual Revised April 2008 ...
Page 3: ...iv ...
Page 5: ...vi ...
Page 13: ...xiv ...
Page 27: ...8 Basic Operating Procedure Section 1 5 ...
Page 57: ...38 Unit Functions Section 2 3 ...
Page 101: ...82 DeviceNet Explicit Messages Appendix A ...
Page 113: ...94 Standard Models Appendix C ...
Page 115: ...96 Power Consumption Tables Appendix D ...
Page 117: ...98 I O Current Consumption Appendix E ...
Page 119: ...100 Glossary ...