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MELSEC-
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8 OTHER FUNCTIONS
REMARK
In the case the OS reception area over flows (e.g. when the reception data is not
read) when the flow control is not performed, the reception error read request
(RXn3) turns ON (7)) immediately after the reception normal (error) read request
(RXn2, RXn3) that has been ON is turned OFF (6)), and the error code is stored.
In that case, data in the OS reception area are not transferred to the buffer memory.
When any over flow occurs, turn ON the reception read complete (RYn2) again and
clear the OS reception area.
External device
OS reception area over flowing
Reception read complete signal
(RYn2)
Reception normal/error read request signal
(RXn2/RXn3)
R2 reception area
OS reception area
7)6)
5)
3)
2)
4)1)
No. Details
1) Data are transferred from the external device to OS reception area.
2) Data in the OS reception area are transferred to R2 reception area.
3)
After storing data to reception area, the reception normal/error read request signal
(RXn2/RXn3) turns ON.
4)
The OS reception area overflows since data is sent continuously from the external
device without being read out from the reception area.
5) Turn ON the reception read complete signal (RYn2) after reception data are read.
6)
The reception normal/error read request signal (RXn2/RXn3) turns OFF with the
reception read complete signal (RYn2) ON.
7)
The reception error read request signal (RXn3) turns ON since the OS reception area
has over flown.