Omron CJ1W-PRT21 - Accessing from the User Program

3-11
3 Data Exchange with the CPU Unit
CJ-series PROFIBUS Slave Unit Operation Manual for NJ-series CPU Unit (W510)
3-5 Data Exchange with the CPU Unit
3
3-5-2 Accessing From the User Program
These variables are defined by the user and can be used to exchange data with PROFIBUS slave
devices from a user program. User-defined Variables are specified to access user-allocated areas des-
ignated with CX-ConfiguratorFDT for slave devices.
To use this area from the user program, you need to create user-defined variables of AT specification.
From the user program, various types of information are exchanged using AT specified device vari-
ables for CJ-series Unit that are allocated to the I/O ports, and AT specified user-defined variables
that are allocated to slave allocation areas.
Use I/O Map in Sysmac Studio to allocate device variables for CJ-series Unit to the I/O port. Specify
variable names using one of the methods shown below.
1. Select and allocate existing variables.
2. Input a new variable name.
3. Automatically create with "Device variable creation".
The following shows the structure of a variable name created automatically with method 3.
For details on Device Variables for CJ-series Unit, refer to the following:
• 3-6 Device Variables for CJ-series Unit (Software Switches, Statuses)
• 3-7 Device Variables for CJ-series Unit (Configuration)
In the explanations throughout this manual, the default device name automatically created is used
as the device variable name for CJ-series Unit, for example *_StartCommCmd.
For details on the CJ Unit memory, refer to NJ-series CPU Unit Software User’s Manual (Cat. No.
W501)
Sysmac Studio is used to register user-defined variables to the variable table. Specify the user-defined
variables in memory used for CJ-series Unit to which slaves can be allocated.
Below is an example of allocation to user-defined variables.
 CJ1W-PRT21 Slave Unit Configuration
• Machine Number 1
• Station Address 2
• 1 Word In (to master) from host CPU memory area CIO 150
User-defined Variable
3-5-2 Accessing From the User Program
How to Create Device Variables for CJ-series Unit
Name of Device Variable for CJ-series Unit Type
*_StartCommCmd BOOL
Part that identifies the individual Unit.
Part that the user can change and identifies unit func-
tions, statuses and parameters.
How to Create User-defined Variables