34
Access to I/O Data
Section 3-2
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 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
BIT OUT Data Allocation Area
Data allocation
•
2-Point Bit IN Slave Unit
•
4-Point Bit IN Slave Unit
•
2-Point Bit OUT Slave Unit
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Word
address
:
:
:
:
:
:
:
[BIT IN 0]
:
+0
+1
:
+15
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Word
address
[BIT OUT 0]
+0
+1
:
+15
:
:
:
:
:
:
:
:
BIT IN area
1
0
BIT IN area
1
2
3
0
BIT OUT area
1
0
Summary of Contents for 3G8F7-CRM21
Page 4: ...iv...
Page 10: ...x TABLE OF CONTENTS...
Page 46: ...26 Connecting the Communications Power Supply Cables Section 2 4...
Page 74: ...54 Board Hardware Error Notification Section 4 8...
Page 173: ...153 APPENDIX D Sample Program D 1 Sample Program 154...
Page 230: ...210 Wiring for Power Supply Section E 5...
Page 234: ...214 Index...
Page 236: ...216 Revision History...
Page 237: ......