Mitsubishi Electric MELSEC-Q00U(J)CPU

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(1) Outline of the processing
The following describes the details of the refresh processing.
*1 The remote input refresh area indicates the area to be used when auto refresh is set to the input (X) in the CC-Link IE,
CC-Link IE Field Network Basic, MELSECNET/H, or CC-Link. Data in the remote input refresh area will be refreshed
automatically during END processing.
*2 Data in the programming tool input area can be turned on or off by the following:
•Test operation of a programming tool
•Writing data from the network module
•Writing data from an external device using the MC protocol
• Writing data using the simple PLC communication function
*3 Data in the output (Y) device memory can be turned on or off by the following:
•Test operation of a programming tool
•Writing data from an external device using the MC protocol
•Writing data from the network module
• Writing data using the simple PLC communication function
*4 This applies only to the QnUDVCPU and QnUDPVCPU.
(a) Input
On/off data of an input module are batch-input to the area for communication with the input module in the CPU
module before the start of sequence program operations.
The CPU module performs sequence program operations using the on/off data stored in the input (X) device
memory.
(b) 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.
Item Description
Input refresh
Before program operation, input data are collectively read out from the input modules (1), the OR processing with
the programming tool input area and remote input refresh area is executed, and then the data are stored in the
input (X) device memory.
Output refresh Before program operation, data in the output (Y) device memory (2) are collectively output to the output module.
Execution of an input
contact instruction
Input data in the input (X) device memory (3) are read out and the program is executed.
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 stored to the output (Y) device memory.
CPU module
CPU (operation
processing area)
3)
4)
*3
5)
X0
Y22
Input (X)
device
memory
Input module
access area
Output (Y)
device
memory
Input
refresh
Network
module
Network
module
Input
module
Output
module
1)
Output
refresh
2)
Remote
input refresh
area
*1
Programming
tool input
area
*2
Y20
Built-in network
*4
(CC-Link IEF Basic)
Built-in network
*4
(CC-Link IEF Basic)