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2 Initial Settings and Allocations of Device Variable for CJ-series Unit
2-14
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
2-3 Device Variable for CJ-series Unit
The function of each device variable for CJ-series Unit is explained in this section.
The following explanations use variables names automatically created on the I/O Map View of Sysmac
Studio.
With the NJ series, the following three types of data in the Operation Data and System Settings data of
the Serial Communications Unit are pre-defined as the I/O ports.
Allocate device variables for CJ-series Unit to I/O ports to use.
• System Settings (to set the modes, communications specifications, and other settings for the Serial
Communications Unit.)
• Software switch (for the CPU Unit to instruct the Serial Communications Unit to execute various func-
tions)
• Status (to indicate the status of the Serial Communications Unit or error information)
The following subsections explain each type of data for the device variables for CJ-series Unit for Serial
Comunications Unit.
For the device variable names for CJ-series Unit and the addresses of the Operation Data and the Sys-
tem Settings data, refer to A-1-2 Differences in Methods for Access from a User Program.
These device variables for CJ-series Unit are used for System Settings. They are used to set the
modes, communications specifications, and other settings for the Serial Communications Unit. The
data is transferred from the CPU Unit to the Serial Communications Unit when the Controller is reset,
the serial communications port setting is changed, or the Unit is restarted.
Precautions for Safe Use
Before restarting the Serial Communications Unit after any of the System Settings are changed,
thoroughly confirm the safety of the target device for connection.
2-3-1 Allocations of Device Variable for CJ-series Unit
2-3-2 Device Variable for CJ-series Unit for System Settings