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2 Initial Settings and Allocations of Device Variable for CJ-series Unit
2-12
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
The CPU Unit and the Serial Communications Unit exchange data via the memory within the CPU Unit
used for the CJ-series Unit.
For details of the memory used for CJ-series Unit, refer to NJ-series CPU Unit Software User's Manual
(W501).
The user program exchanges data using the following.
Allocate device variables for CJ-series Unit to I/O ports on the I/O Map View of Sysmac Studio.
Specify the variable name to be allocated by one of the following methods:
• Select and allocate an existing variables.
• Input a new variable name.
• Automatically create with "Create Device Variable."
The following is the configuration of variable names created with the last method: Automatic creation.
For details of the device variable for CJ-series Unit, refer to 2-3 Device Variable for CJ-series Unit.
In the explanations from here on, the device name automatically created is used as the device variable
name for CJ-series Unit, for example *_P1_SgwDsblCmd.
How to Access from User Program
Data type Access method
Software switch Device variable for CJ-series Unit
Status data
System Settings data
Send/receive data of Serial Port I/O instructions in No-protocol Mode User-defined variable
Send/receive data with Protocol Macro instruction in Protocol Macro
Mode
Data in allocation area in Modbus-RTU Slave Mode
Serial Communications Port Settings Change Bits, Unit Restart Bits, Net-
work Communications Instruction Enabled Flag System-defined variable
2-2-2 How to Specify and Create Variables
How to Specify Device Variable for CJ-series Unit
Name of device variable for CJ-series Unit
*_ P1_SgwDsblCmd
This is the device name when this unit is registered
in the Unit Configuration. (By default, a device name
is assigned from "J01" in the order of registration in
the Unit Configuration.)
This identifies the individual unit.
This is an I/O port name. The name indicates unit
functions, statuses and parameters.