System-Defined Variables; A-3-1 System-Defined Variables For The Overall Nj-Series Controller (No Category; System-Defined Variables For The Overall Nj-Series Controller (No Category - Omron NJ-series User Manual

Appendices
A-3

System-defined Variables

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.
These variables 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.
Basically, system-defined variables are classified according to the function modules. The variables start
with the following category names.
Function module
System-defined variables for the overall
NJ-series Controller
PLC Function Module
Motion Control Function Module
EtherCAT Master Function Module
EtherNet/IP Function Module
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.
A-3-1 System-defined Variables for the Overall NJ-series Controller
(No Category)
 Functional Classification: Clock
Variable name Meaning
_CurrentTime System Time
A-26
None
_PLC
_CJB
_MC
_EC
_EIP
Function
The function of the variable is described.
Function
Contains the CPU Unit's internal clock data.
Category name
Data type
The data The range of
type of the values that the
variable is variable can
given. take is given.
Data type
DATE_ DT#1970-01-
AND_ 01-00:00:00 to
TIME DT#2106-02-
06-23:59:59
NJ-series CPU Unit Software User's Manual (W501)
Range of
Reference
values
The page of
the individual
system-
defined vari-
able specifi-
cations table
is given.
Range of
Reference
values
page A-49