Omron NX-AD series, User Manual

Page: 259 / 290

A - 39
Appendices
NX-series Analog I/O Units User’s Manual for Analog Input Units and Analog Output Units (W522)
A-
3 List
of
NX Object
s
A
A-
3-1 F
ormat o
f Object Descr
ipt
ions
A-3 List of NX Objects
This section describes the NX objects of the Analog Input Units and Analog Output 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 Coupler 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 Object Descriptions
Index
(hex)
Subindex
(hex)
Object name
Default
value
Data range Unit
Data
type
Acc
ess
I/O
allo-
cat-
ion
Data
attri-
bute
Index (Hex) : This is the index of the NX object that is expressed as a four-digit hexadecimal
number.
Subindex (Hex) : This is the subindex of the NX object that is expressed as a two-digit hexadeci-
mal number.
Object name : This is the name of the object. For a subindex, this is the name of the subindex.
Default value : This is the value that is set by default.
Data range : For a read-only (RO) NX object, this is the range of the data you can read. For a
read-write (RW) NX object, this is the setting range of the data.
Unit : The unit is the physical units.
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