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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.
On/off
data
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.
CPU (operation
processing area)
DX0
Y20
*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
80
Device memory
0
DX10
CPU module
CPU module
Input (X)
3)
device
memory
4)
DY25
5)
Input of on/off data upon
instruction execution
Output of on/off data upon
instruction execution
Input module or
output module
2) Programming
1)
tool input
*1
area
*2
Output (Y)
device
memory
On/off data
Input
module
Output
module
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