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2-9
2 Initial Settings and Allocations of Device Variable for CJ-series Unit
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
2-2
Data Exc
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ang
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with
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2
2-2-1 D
ata Flo
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* This is executed when the Controller is reset, the serial communications port setting is changed, or the Unit is
restarted.
NJ-series CPU Unit
User program
I/O port
Device variable for
CJ-series Unit
Device variable for
CJ-series Unit
Device variable for
CJ-series Unit
User-defined
variable
Serial Communications Port
Settings Change Bits
CPU Bus Unit
Restart Bits
Status (for port 1)
Status (for port 2)
Software switch (for port 1)
Software switch (for port 2)
Setup Area (for port 1)
Setup Area (for port 2)
Send/receive data
Instruction
AT specification
AT specification
AT specification
AT specification
For input
For output
For System Setting
System-defined Variable
Operation Data
Memory used for CJ-series Unit
System Settings data
I/O refresh
I/O refresh
Update (*)
During execution of the instruction
Serial Communications Unit
Status and
software
switch data
for each
communications
port
Send data
Receive data
System Setup
data for each
communications
port