User`s manual

261
CHAPTER 11 DATA COMMUNICATIONS USING USER FRAMES
11
11.2 Data Reception
Remark
The following shows the difference in how reception data for each reception method (Format-0 and Format-1) is treated
when data is received using the combination of (first frame + arbitrary data).
● When data is received using Format-0 (combination (1-C))
• The Q series C24 regards all arbitrary data after the first frame as valid data and stores it sequentially in the
reception area.
• A read request is performed to the programmable controller CPU each time arbitrary data equaling the received
data count is received, and this process is repeated.
● When data is received using Format-1 (combination (1-D, 1-E))
• After the first frame is received, the Q series C24 regards all arbitrary data equaling exclusive format-1 received
data count specified for the received first frame combination as valid data and stores it in the reception area. It
then performs a read request to the programmable controller CPU.
• After data equaling exclusive format-1 received data count is received, any data until the next first frame will be
ignored. (Data will not be stored in the reception area.)
First frame
Equaling the received
data count
Stored in the
reception area
Equaling the received
data count
Stored in the
reception area
: Reception start timing
: Receive complete timing (read timing)
Reception
data
Ignored
Arbitrary data
Equaling exclusive format-1
received data count
First frame Arbitrary data
Stored in the reception area Stored in the reception area
First frame
: Reception start timing
: Receive complete timing (read timing)
Reception
data
Ignored
Arbitrary data
Reception
data
Ignored
Equaling exclusive format-1
received data count