Data Exchange With The Cpu Unit; Data Flow - Omron CJ1W-PRT21 Operation Manual

3 Data Exchange with the CPU Unit

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.
3-5-1

Data Flow

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.
Control and Status
Area, Configuration
Information Area
Data Mapping
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.
3-8
Data type
Software Switches, Allocated CIO Area
Status flags
Configuration Informa- Allocated DM Area
tion Area
User-set allocation Any area of CIO, DM, WR, HR and EM
controller by PROFI-
BUS Master Unit
CJ-series PROFIBUS Slave Unit Operation Manual for NJ-series CPU Unit (W510)
CJ Unit memory Access method
Device Variable for CJ-
series Unit
User-defined Variables