Mitsubishi Electric MELSEC iQ-R Series User Manual page 287

Timing chart for reception processing of C24
The charts indicating the timing of the reception processing for data reception using a user frame, including the reception
processing by the receive end data quantity, are shown below.
The numbers in the table indicate the timing of a received data read request to the CPU module.
Combination Amount of received data of
arbitrary data
Combi 1-A Receive data quantity < receive
nation end data quantity
with
Receive data quantity  Receive
the
end data quantity
start
1-B Receive data quantity = 0
frame
Receive data quantity  Receive
1-C
end data quantity
Receive data quantity > Receive
end data quantity
1-D Receive data quantity
Method 1 dedicated receive end
data quantity > 0
1-E Receive data quantity
Method 1 dedicated receive end
data quantity = 0
*2
Combi 2-A Receive data quantity < Receive
nation end data quantity
without
Receive data quantity  Receive
the
end data quantity
start
frame
*2
2-B Receive data quantity = 0
*1 The reception processing by the receive end code is not performed when the same data as the receive end code has been registered in
the final frame.
*2 The data reception interval is not monitored with the no-reception monitoring time (timer 0) when only the final frame is set.
When a reception error is detected, C24 stores arbitrary data portion of the data received immediately before
the error in the receive area on the buffer memory, then turns the 'CH1 reception abnormal detection' (X4) ON.
Timing pattern number
Received data
Received When
data prior to receiving the
the start frame
reception of
the start
frame
Deleted Data reception
start
Data 1-E
recepti
on start
 
15 DATA COMMUNICATIONS USING USER FRAMES
When receiving When
arbitrary data in receiving the
the reception final frame
message

1-A(1)
1-A(2)

1-B

1-C(1)
1-C(2)
1-D

Data reception start 2-A(1)
Data 2-A(2)
recepti
on start

Data 2-B
reception
start
15.2 Data Reception
When receiving
*1
the end code
Data of the end code
is treated as part of
arbitrary data.

Data of the end code
is treated as part of
arbitrary data.
15

2-A(3)
2-A(4)

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