Direct Mode - Mitsubishi Q-Series User Manual

4 SEQUENCE PROGRAM CONFIGURATION & EXECUTION
CONDITIONS

4.7.2 Direct mode

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(1) Definition of direct mode
In the direct mode the communication with the input/output modules is performed
when executing sequence program instructions.
With Basic model QCPU, direct mode I/O processing can be executed by using
direct access inputs (DX) and direct access outputs (DY).
See 10.2.1 for direct access inputs. See 10.2.2 for direct access outputs.
Basic model QCPU
CPU (operation processing area)
Input (X)
3)
device
memory
DX0
Y20
DY25
• When an input contact instruction has been executed:
An OR operation is executed for the input module's input information 1) and
peripheral device input area's input information 2), and the result is stored in the
input (X) device memory. This data is then used as input information 3) at
sequence program execution.
• When an output contact instruction has been executed:
Output information 4) is read from the output (Y) device memory, and a sequence
program is executed.
• When an output OUT instruction has been executed:
The sequence program's operation result 5) is output to the output module, and is
stored in the output (Y) device memory.
Fig.4.8 Input/Output Information Flow at Direct Mode
REMARK
1: The GX Developer input area can be switched ON and OFF by the following:
• Test operation by the GX Developer
• A network refresh by the MELSECNET/H network system
• Writhing from a serial communication module
• CC-Link automatic refresh
2: The output (Y) device memory can be switched ON and OFF by the following:
• Test operation by the GX Developer
• A network refresh by the MELSECNET/H network system
• Writhing from a serial communication module
• CC-Link automatic refresh
Remote input
refresh area
GX Developer
2)
input area
2
4)
Output (Y)
device
5)
memory
MELSEC-Q
3
1)
Input
module
1
Output
module
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