Omron CJ1W-DRM21 - 3-1 Data Exchange with the CPU Unit; Data Flow; Data Exchange with the CPU Unit

3 Data Exchange with the CPU Unit
3-2
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
3-1 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 DeviceNet Unit.
The CPU Units and CJ-series DeviceNet Units exchange data as shown in the table and chart below.
Data exchange type
Note The allocations setting table and slave detailed status data are retained in the CPU unit by the battery even
during power interruptions.
3-1-1 Data Flow
Access methods from
the user program
AT specification
destination
Data exchange timing Unit data type
Device variable for
CJ-series Unit
I/O port During I/O refresh Software switch
Status
Allocations setting table
Slave detailed status
User-defined variable Memory used for
CJ-series Unit
During I/O refresh Slave I/O Data
At I/O refresh after instruc-
tion execution
Message send/receive
data for communications
instructions
System-defined variable None During I/O refresh Unit Restart Flag, Com-
munications Port Enabled
Flags, etc.