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(3) Output
The operation results of the sequence program is output to the output (Y) device memory in the CPU
module every time program operation is performed. Then, the CPU module batch-outputs the on/off
data in the output (Y) device memory to an output module before the start of sequence program
operations.
CPU (operation
processing area)
3)
X0
Y22
Y20
•Input refresh:
Before the start of sequence program operations, the CPU module batch-reads input data (1)) from
an input module, performs a logical OR operation with data in the GX Developer input area or data
in the remote input refresh area, and then stores the result in the input (X) device memory.
•Output refresh:
Before the start of sequence program operations, the CPU module batch-outputs data in the output
(Y) device memory (2)) to the output module.
•When a contact instruction for input is executed:
The CPU module reads input data (3)) from the input (X) device memory and executes a sequence
program.
•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 stores the operation result of the sequence program (5)) in the output (Y) device
memory.
CPU module
Remote
input refresh
area
Input (X)
GX Developer
device
input area
memory
Input module
access area
4)
*3
Output (Y)
device
5)
memory
Figure 3.3 I/O data flow in refresh mode
CHAPTER3 CPU MODULE OPERATION
Network
module
*1
Input
refresh
Input
*2
module
1)
Output
refresh
Output
module
2)
Network
module
1
2
3
4
5
6
7
8
3 - 10
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