A - 5
Appendices
NX-series Communications Interface Units User’s Manual (W540)
A-3 List of NX Objects
A
A-3-1 Format of NX Object Descriptions
A-3 List of NX Objects
This section describes the NX objects of the CIF Units.
The method to access NX objects through instructions
or other messages depends on where the NX
Unit is connected.
If the NX Unit is connected to a CPU Unit,
access is possible with the Read NX Unit Object instruction
and the Write NX Unit Object instruction.
When the NX Unit is connected to a Communications Cou
pler Unit, the method depends on the con-
nected communications master and Communications Coupler Unit.
Refer to the user's manual for the connected Communications Coupler Unit for method to use mes-
sages to access NX objects on Slave Terminals.
In this manual, NX objects are described with the following format.
A-3-1 Format of NX Object Descriptions
Index
(hex)
Subindex
(hex)
Object name Default Data range Unit
Data
type
Access
I/O
alloca-
tion
Data
attri-
bute
Index (hex) : This is the index of the NX object that is expressed a
s a four-digit hexadecimal number.
Subindex (hex) : This is the subindex of the NX object expres
sed by a two-digit hexadecimal number.
Object name : This is the name of the object. For a subindex, this is th
e name of the subindex.
Default : This is the value that is set by default.
Data range : For a read-only (RO) NX object, this is the ra
nge of the data you can read. For a
read-write (RW) NX object, this is the setting range of the data.
Unit : The physical unit of the object.
Data type : This is the data type of the object.
Access : This data tells if the object is read-only or read/write.
RO: Read only
RW: Read/write
I/O allocation : This tells whether I/O allocation is allowed.
Data attribute : This is the timing when changes to writable NX objects are enabled.
Y: Enabled by restarting
N: Enabled at all times
---: Write-prohibited
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