Omron GRT1 - 27-11-2006, Руководство по эксплуатации

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34
Station Address Settings and I/O Allocation
Section 3-1
2. One block of mapped Output data (from the Master Unit) and one block of
mapped Input data are maintained in the GRT1-PRT and transferred to/
from the Master Unit.
3. The first Input data word always contains the SmartSlice I/O Status word.
4. Bit-sized SmartSlice I/O Units, e.g. GRT1-ID4, GRT1-OD4 are grouped to-
gether in words.
5. Word sized SmartSlice I/O Units, e.g. GRT1-AD2, GRT1-DA2V are
mapped to one or more words.
6. Total size of mapped I/O data can be 64 words output and 64 words input.
I/O Allocation Example I/O data is mapped to the GRT1-PRT Units I/O data blocks in the same order
the SmartSlice I/O Units are connected to the PROFIBUS Communication
Unit, regardless of the I/O Units’ models.
The example below shows the I/O data mapping to the Input / Output blocks.
Note I/O Units with bit allocation (e.g. GRT1-ID4/OD4) allocate data in 2-bit units.
I/O Units with word allocation (such as the GRT1-AD2) are allocated data in
1-word units. The following example shows the mapping of Output Units.
+2
+3
#4
+1
Word
15 8
0
#1 #3 #2
Word
15 8
0
Some areas may be unused
when data is mapped.
Communi-
cation
Unit
Communication Unit status
Unused
First word First word Unused
Output area
Input area
#6 #5
#6
ROS2 #5
OD4 #4
AD2 #3
ID4 #2
ID4 #1
ID4
#2
OD4 #3
OD4 #4
ROS
2
#5
OD4 #1
OD4
+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 which require 4 bits,
There may be unused areas
as shown in the following table.
Unused
SmartSlice I/O Unit configuration
15
8
0
#6
DA2V