Data Flow; Data Exchange With The Cpu Unit - Omron CJ1W-DRM21 Operation Manual

3 Data Exchange with the CPU Unit

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.
3-1-1

Data Flow

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