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A-6
System-defined Variables Related to
Hardware
System-defined variables are assigned specific functions by the system. They are registered in the
global variable table, or the local variable table for each POU, in advance.
The variable names cannot be changed. Some of the variables start with an underbar and some start
with "P_".
Some of the system-defined variables are read-only and some are read/write.
You read and write the variables with the user program, with communications from external devices,
with the Sysmac Studio, or with an NS-series PT.
The variables are described in the tables of this appendix as shown below.
Variable name
Meaning
This is the system-
This is the mean-
defined variable
ing of the vari-
name. The prefix
able.
gives the category
name.
A version in parentheses in the Variable name column is the unit version of the CPU Unit when the sys-
tem-defined variable was added.
The system-defined variables that are related to hardware are listed in the rest of this appendix.
A-6-1
System-defined Variables for the Overall NJ-series Controller
(No Category)
Functional Classification: Clock
Variable name
Meaning
_CurrentTime
System Time
NJ-series CPU Unit Hardware User's Manual (W500)
Function
The function of the variable is described.
Function
Contains the CPU Unit's internal clock data.
Appendices
Range of
Data type
values
The data
The range of
type of the
values that the
variable is
variable can
given.
take is given.
Range of
Data type
values
DATE_
DT#1970-01-
AND_
01-00:00:00 to
TIME
DT#2106-02-
06-23:59:59
Reference
The page of
the individual
system-
defined vari-
able specifi-
cations table
is given.
Reference
page A-112
A-103
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