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Access to I/O Data
Precautions for Correct Use
Bit
15
14
Word
address
+0
+1
:
:
+15
Bit
15
14
Word
address
+0
+1
:
:
+15
34
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 bits in the Bit IN area and 4 bits in Bit OUT area, Bit IN
Slave Unit whose node address is 0, and Bit OUT Slave Units
whose node address is either 0 or 1 cannot participate.
Image of the above Precautions for Correct Use
BIT IN Data Allocation Area
13
12
11
10
:
:
BIT OUT Data Allocation Area
13
12
11
10
:
:
Data allocation
•
2-Point Bit IN Slave Unit
BIT IN area
•
4-Point Bit IN Slave Unit
BIT IN area
•
2-Point Bit OUT Slave Unit
BIT OUT area
9
8
7
6
:
:
9
8
7
6
:
:
Section 3-2
5
4
3
2
[BIT IN 0]
:
:
5
4
3
2
[BIT OUT 0]
:
:
1
3
2
1
1
1
0
:
1
0
:
0
0
0
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