80
2.8.2 Direct mode
In a direct mode, the CPU module performs I/O processing when each instruction is executed in a sequence
program.
With this mode, the CPU module uses the direct access input (DX) and direct access output (DY) to perform I/O
processing.
(1) Outline of the processing
The following describes the details of the Direct processing.
*1 Data in the programming tool input area can be turned on or off by the following:
•Test operation of a programming tool
•Writing data from the network module
•Writing data from an external device using the MC protocol
• Writing data using the simple PLC communication function
*2 Data in the output (Y) device memory can be turned on or off by the following:
•Test operation of a programming tool
•Writing data from an external device using the MC protocol
•Writing data from the network module
• Writing data using the simple PLC communication function
Input module or
output module
CPU module
Device memory
0
DX10
On/off
data
On/off data
Input of on/off data upon
instruction execution
Output of on/off data upon
instruction execution
CPU module
CPU (operation
processing area)
3)
4)
*2
5)
DX0
Y20
Input (X)
device
memory
Output (Y)
device
memory
Input
module
Output
module
1)
2)
Programming
tool input
area
*1
DY25
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