Omron SmartSlice GRT1 Series

15
Unit Numbers and I/O Allocations 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 Communications Unit’s Pro-
gramming Device, data is allocated from the first word starting with the Com-
munications 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 allocations (such as the GRT1-ID4/OD4) are allocated data
in 2-bit units. I/O Units with word allocations (such as the GRT1-AD2) are allo-
cated data in 1-word units. The following example shows the allocations to
Output Units.
#1
ID4
#2
ID4
#3
ID4
#4
AD2
#6
OD4
#7
ROS2
#8
OD8
#9
OD4
#5
ID8
First Word
+1
+2
+3
Communications Unit Status
Unused
#3 #2 #1
#4
+4 #5
First Word
+1
+2
Unused
#7 #6
Unused
Unused
#9
Some areas may be unused when data is allocated.
Word
Input Area
08
15
015 8
Output Area
Unused
#8
Commu-
nications
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.
Slice I/O Terminal Configuration
#1
OD4
#2
OD4
#3
OD4
#4
ROS2
#6
DA2
#5
OD4
#8
OD8
#7
OD4
+0
+1
+2
+3
#
5
#3 #2 #1
#6
+4
Word
8
15
0
Unused
#
5
#
4
Unused
#7
+5
Unused #8
Communi-
cations
Unit
Data in these areas will not be output.