446
APPENDICES APPENDIX
Appendix 1 Read/Write by Device Extension Specification
Access for index modification
Index modification is the indirect specification using index registers.
Accesses shown below are available by setting the subcommand in a request data to 008 or 00C0.
The following device access commands can be used for access.
Access to index the network No. and start input/output number
When accessing a link direct device, the access target network No. can be specified by the index register with indirect
specification. Also, when accessing a module access device or a CPU buffer memory access device, the access target start
input/output number can be specified by the index register with indirect specification.
The access target can be switched with one message, by changing the value of the index register in CPU module programs.
The access target can be switched by changing the value of 'Z0', when multiple network modules are mounted onto the
access target.
Target data Reference
Network No. or start input/output number Page 446 Access to index the network No. and start input/output number
Device number Page 447 Access to index the device number
Function Command Subcommand
Random read 0403 0080, 0082, 00C0
Random write 1402 0080, 0081, 0082, 0083
Register monitor data 0801 0080, 0082, 00C0
UJ
ZZ
\\
Extension specification,
Direct memory specification
Device
code
Device number
Extension specification modification
+
Extension specification,
Direct memory specification
Device
code
Device number
Extension specification modification
+
0
Z0
SW0
SW5
SW0
SW5
SW0
SW5
Specify this in request data.
Network number
(offset value)
1 to 3
Network number to access
Specify this on the program of the CPU module.
Module on
network number 1
Module on
network number 2
Module on
network number 3
Specify access destination
device in request data.
(Access destination) (Access destination) (Access destination)
By changing the "Z0" value, the access destination can be changed.
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+
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