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MELSEC-Q
4 ABOUT QD51 (-R24) FUNCTIONS
4.8.2 Data communications by expansion register (ED)
The QD51 (-R24)'s expansion register (ED) is a device which can store data from all
tasks and perform reading of data.
(For details of the expansion relay, refer to Section 3.5.4.)
Expansion register
(ED0 to ED1023)
Reading of data
Reading of data
Storing of data
Data storage
Program 1 Program 2
The expansion registers that can be used by the QD51 (-R24) are ED0 to ED1023,
1024 points.
[Commands and functions used]
The commands and functions used to carry out data communications by the expansion
registers are shown below.
Command, Function Name Processing Contents
W@ : Performs storage of data in the expansion register and reading of
data.
GETMEM : Performs reading of expansion register data.
PUTMEM : Performs storage of data in the expansion register.
4.8.3 Data communications by common memory
Buffer memory in the QD51 (-R24) is common memory which can be used to carry out
storage and reading of data from all tasks.
(For details of the common memory, refer to Section 3.5.3.)
Common memory
Reading of data
Reading of data
Storing of data
Data storage
Program 1 Program 2
The common memory that can be used in the QD51 (-R24) consists of 4 k words
(8 k bytes) of memory space.
[Commands and functions used]
The commands and functions used to carry out data communications by the common
memory are shown below.
Command, Function Name Processing Contents
GETMEM : Performs reading of data in common memory.
PUTMEM : Performs storage of data in common memory.
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