Timing For Start/Completion Of Data Reception - Mitsubishi MELSEC L Series User Manual

11.2.2 Timing for start/completion of data reception

Setting the user
frame for reception
With the first frame
Reception
Without the first
start
frame
Receive
—
complete
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This section explains the reading of reception data based on the user frame and other
factors (such as the receive complete code and received data count) during data
reception using a user frame.
(1) Timing for start/completion of data reception
The following describes the timing for start/completion of the data reception
processing with the Q series C24.
• Data reception using a user frame
• Data reception using the receive complete code and received data count
initially set in the Q series C24
• Data reception using exclusive format-1 received data count
When using format-0
(See (2) in this section for each timing.)
When the first data of arbitrary data is
received.
When the factor of receive complete (timing of reception data reading to the
programmable controller CPU) is one of the following:
• When the last frame is received.
• When data of the receive complete code
is received. (In the case of a
combination without the first frame)
• When data equaling the received data
count is received.
• When a receive error (time out for the
no-reception monitoring time (timer 0))
occurs.
All arbitrary data received up to the point when one of the above occurs or a receive
error is generated is stored in the reception area.
11 DATA COMMUNICATIONS USING USER FRAMES
When the first frame is received.
(Depends on prior settings. See (2) in this section.)
When using Format-1
(See (2) in this section for each timing.)
—
• When exclusive format-1 received data
count is specified as 0 and the first
frame is received.
• When exclusive format-1 received data
count is specified as 1 or more and data
equaling this count is received.
• When a receive error (time out for the
no-reception monitoring time (timer 0))
occurs.
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