Mitsubishi Electric MELSEC iQ-R Series - Direct Mode

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8 RUNNING A PROGRAM
8.3 Data Communication and I/O Processing
Direct mode
The CPU module performs I/O processing when each instruction is executed in a program.
With this mode, the CPU module uses the direct access input (DX) and direct access output (DY) to perform I/O processing.
Outline of the processing
The following describes the details of the direct mode.
*1 Data in the engineering tool input area can be turned on or off by the following:
 Test operation of an engineering tool
 Writing data from the network module
 Writing data from an external device using SLMP
*2 Data in the output (Y) device memory can be turned on or off by the following:
 Test operation of an engineering tool
 Writing data from the network module
 Writing data from an external device using SLMP
Item Description
Execution of an input contact
instruction
The OR processing is executed with the input information of the input module (1) and the input data of the engineering
tool input area (2) or remote input refresh area. The result is stored in the input (X) device memory and is used as input
data (3) to execute the program.
Execution of an output contact
instruction
Output data in the output (Y) device memory (4) are read out and the program is executed.
Execution of the OUT instruction The operation result of the program (5) are output to the output module, and stored in the output (Y) device memory.
0
DX10
Input module or
output module
CPU module
Device memory
On/off
data
On/off data
Input of on/off data upon
instruction execution
Output of on/off data upon
instruction execution
(3)
(4)
(5)
DX0
Y20
(1)
(2)
DY25
CPU module
CPU (operation
processing area)
*2
Input (X) device memory
Output (Y) device memory
Input module
Output module
Engineering tool input area
*1