Omron CJ1W-PRT21, Руководство по эксплуатации

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3 Data Exchange with the CPU Unit
3-8
CJ-series PROFIBUS Slave Unit Operation Manual for NJ-series CPU Unit (W510)
3-5 Data Exchange with the CPU Unit
Data exchange between this Unit and the CPU Units uses the I/O port and memory for CJ-series Unit
allocated to the PROFIBUS Slave Unit.
The CPU Unit and CJ-series PROFIBUS Slave Unit exchange various types of information at each I/O
refresh via the memory for CJ-series Units within the CPU Unit.
From the user program, various types of information are exchanged using device variables and user-
defined variables. Device Variables are positioned internally in the CPU Bus Unit words allocated in
CIO and DM areas. User-defined variables are created by the user and can be allocated to specific
memory areas used for CJ-series Units allocated to slaves.
Additional Information
By using these variables, the user can program without the need to be aware of the configuration
of the memory used for CJ-series Units.
3-5-1 Data Flow
Data type CJ Unit memory Access method
Control and Status
Area, Configuration
Information Area Software Switches,
Status flags Allocated CIO Area Device Variable for CJ-
series Unit
Configuration Informa-
tion Area Allocated DM Area
Data Mapping User-set allocation
controller by PROFI-
BUS Master Unit Any area of CIO, DM, WR, HR and EM User-defined Variables