Mitsubishi Electronics 13JW55 ユーザーズマニュアル

 

 

App. - 2

 

 

 
Appendix 1.2  Refresh mode 

In the refresh mode, all changes caused in an input module are imported to the input 

data memory in a programmable controller CPU before every scan. The data in the 

data memory is used for an operation. 

The operation results made in a program for output (Y) are stored to the output data 

memory at every operation. All the data stored in the output data memory is 

batch-output to the output module after the execution of the END instruction. 

The following diagram shows the flow of I/O data in the refresh mode. 

 

Data memory for 
inputs (X)

Data memory for 
outputs (Y)

Programmable controller

CPU
(Operation processing)

Output 
module

Y70

X0

Y75

Input 
module

1)

When inputs 
are refreshed

When outputs 
are refreshed

2)

3)

4)

5)

 

 

• Input refresh 

Input data in the input module is batch-read 1) before the execution of the step 0, 

and stored to the data memory for input (X). 

• Output refresh 

Data 2) in the data memory for output (Y) is batch-output to the output module 

before the execution of the step 0. 

• When the input contact instruction is executed: 

The input data is read from the data memory for input (X) 3), and a sequence 

program is executed. 

• When the output contact instruction is executed: 

The output data 4) is read from the data memory for output (Y), and a sequence 

program is executed. 

• When the output OUT instruction is executed: 

The operation result of the sequence program 5) is stored in the data memory for 

output (Y).