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MELSEC-
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7 USING FRAMES WHEN EXCHANGING DATA
*1 If only the reception head frame is designated, the frame reception will be
completed when the data size set in the reception end data size designation
(
R2
111H) is received.
If both the reception head frame and reception end frame are designated, the
frame reception is completed when the reception end data size is reached. The
data until the next head frame is received is invalid.
(Example)
Completion of frame reception
Reception
head frame
Random data section
Reception
end frame
Reception
data
Reception end data size The data until the head frame
is received is invalid.
Reception
head frame
*2 If the reception head frame and reception end frame are designated, and 0 is
designated for the reception end data size, when the reception end frame is
received, the frame reception will be completed.
This allows the random data section to have a varied length.
POINT
If the R2 detects an error during data reception, the random data section of the
data received until immediately before is stored in the reception area of the buffer
memory, and the reception error read request signal (RXn3) turns ON.