Omron 3G8F7-CRM21 User Manual page 51

Access to I/O Data
Precautions for Correct Use
When a Slave Unit occupies plural allocation areas, other Slave Units which
have the occupied node addresses cannot participate.
Example: When a Slave Unit with node address 0 exists in a network and it
occupies 2 words in the IN area and 4 words in OUT area, Word IN
Slave Units whose node addresses are 0 or 1, and Word OUT Slave
Units whose node addresses are 0, 1, 2 or 3 cannot participate.
Image of the above Precautions for Correct Use
Allocation area for IN Data of a Word IN Slave Unit
Word address Bit 15
+0
+1
+2
IN +3
area
+4
:
+62
+63
Allocation area for OUT Data of a Word OUT Slave Unit
Word address Bit 15
+0
+1
+2
OUT +3
area
+4
:
+62
+63
Data allocation
•
8-Point Word IN Slave Unit
IN area
Unused
•
8-Point Word OUT Slave Unit
OUT area
Unused
[IN data of Word MIX Slave Unit with node address 0]
[OUT data of Word MIX Slave Unit with node address 0]
7 6 5
7 6 5
Section 3-2
Bit 0
Bit 0
4 3 2 1 0
4 3 2 1 0
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