Reception Procedure - Mitsubishi Electric MELSEC iQ-R Series User Manual

Reception procedure

The following shows the reception procedure when a message, including data with the same arrangement as the specified
user frame, is received and the arbitrary data is read to the CPU module.
Procedure
(When the CH1 side interface of C24 receives data)
 Read the user frame setting number received from the target device (-th) out of the start frame number and final frame
number (up to 4 combinations) initially set in the user frame specification for receiving area on the buffer memory from the
'Receive user frame (nth)' (Un\G603).
 Read arbitrary data portion in the reception message from the receive area (Un\G1536 to 2047 (default))
Target device
CPU module (*2)
Reception data
X3
read request
CPU module
Completion device
Status display device
at completion
*1 For received data using a user frame and the timing of reading the received data to the CPU module, refer to the timing for start/
completion of data reception (Page 278 Receive data, Page 284 Timing for start/completion of data reception))
*2 The receive user frame registration number and others should have been set with Engineering tool.
At the time of debugging, the initial setting value for data reception shall be set prior to data reception, but after debugging is completed,
it shall be set to the startup of C24. (Page 289 Setting of receive user frames)
*3 Reading () for the CPU module to check which user frame was received by C24 and reading of the received data ().
15 DATA COMMUNICATIONS USING USER FRAMES
288
15.2 Data Reception
Receive data with the user frame (*1)
User frame
Arbitrary data
(first frame)
(*1)
User frame
(last frame)
(*3 Ó)
INPUT
ON
Abnormal
ON
completion
Normal
completion
1 scan
(*3 Ò)
FROM