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•When a contact instruction for input is executed:
The CPU module performs a logical OR operation between input data from the input module (1))
and input data in the GX Developer input area (2)) or data in the remote input refresh area.
Then, the module stores the result in the input (X) device memory and executes a sequence
program using the stored result as input data (3)).
•When a contact instruction for output is executed:
The CPU module reads output data (4)) from the output (Y) device memory and executes a
sequence program.
•When the OUT instruction for output is executed:
The CPU module outputs the operation result of the sequence program (5)) to the output module
and also stores the result in the output (Y) device memory.
The remote input refresh area indicates the area to be used when auto refresh is set to the input (X) in the
*1:
CC-Link IE controller network, MELSECNET/H, or CC-Link.
Data in the remote input refresh area will be refreshed automatically during END processing.
Data in the GX Developer input area can be turned on/off by the following operation.
*2:
•
Test operation by GX Developer
•
Writing data from a network module
Data in the output (Y) device memory can be turned on/off by the following operation.
*3:
•
Test operation by GX Developer
•
Refresh via CC-Link IE controller network or MELSECNET/H
•
Writing data from an external device using the MC protocol
•
Auto refresh via CC-Link
3 - 13
CPU module
CPU (operation
processing area)
Input (X)
3)
device
memory
DX0
4)
Y20
DY25
5)
Figure 3.7 I/O data flow in direct mode
Remote
input refresh
*1
area
GX
2)
1)
Developer
*2
input area
*3
Output (Y)
device
memory
Network
module
Input
module
Output
module
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