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8 OTHER FUNCTIONS
8.7 Clearing the OS reception area
This function is used to initialize the OS reception area in the R2.
When the OS reception area clear request signal (RYn6) is turned OFF by the
sequence program, the R2 OS reception area will be initialized.
(1) OS reception area
(a) The OS reception area is the OS area used by the R2 to temporarily store
the reception data.
1) Data received before a request for reading out receive data to the
programmable controller CPU is generated by the user-set "reception
end data size" and "reception end frame".
2) Data received from external device when programmable controller
CPU request reading of reception data stored in buffer memory
reception area.
(b) The reception data stored in the OS reception area is stored (transmitted) to
the buffer memory reception area by the R2 when one of the following
causes occurs.
1) When a request for reading out receive data to the programmable
controller CPU is generated by the user-set "reception end data size"
and "reception end frame".
2) When reception is forcibly completed.
(c) The word/byte size of the reception data stored in the OS reception area
can be confirmed with the following buffer memory.
Note that when using the buffer memory automatic update function, the
buffer will be updated at the automatic update timing, so the accurate
reception data size cannot be read at the reception completion timing.
To confirm the size of the reception data stored in the OS reception area,
read the reception data size with the RW update function.
The contents of the OS reception area cannot be read directly from the
programmable controller CPU.
•
Data size storage area in OS reception area (
R2
1B6H)
The word/byte size of the data stored in the OS reception area of the R2
(remaining reception data for which read request has not been made to
programmable controller CPU) is stored.
The data size unit follows the word/byte unit designation (
R2
102H).
The data size in the OS reception area is updated every 100ms.
b15 b0
1B6
H
∼
(Data size in OS reception area)
The data size in the OS reception area is stored.