Mitsubishi Electric MELSEC iQ-RJ71C24-R2 - Page 295

15 DATA COMMUNICATIONS USING USER FRAMES
15.2 Data Reception
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15
■Start frame No. designation area and final frame No. designation area (Un\G174 to 181/334 to
341)
From among the user frames registered in C24, designate the user frame No. to be used by following the designation method
as shown below.
• 0H (0): No designation
• 1H to 3E7H (1 to 999): Designate the default registration frame (for OS ROM registration).
• 3E8H to 4AFH (1000 to 1199): Designate the user frame (for flash ROM registration).
• 8001H to 801FH (-32767 to -32737): Designate the user frame (for buffer memory registration).
Precautions
• For the receive user frames, the start frame and final frame are set as a pair, regardless of whether the target device
transmits these frames.
(If the target device does not transmit either one of the frames, set the frame No. that is not transmitted to "0" (No
designation).)
• A maximum of four combinations of start and final frames can be set for the nonprocedural protocol.
However, if there is a combination that specifies the start frame when multiple combinations are set, specify the start frame
for all other combinations.
In addition, set in the following order starting from the first buffer memory.
When specifying the start frame
Each frame number for combinations that specify the start frame and the final frame
Each frame number for combinations that specify the start frame but not the final frame
When setting multiple combinations
For the combination that specifies only the final frame without specifying the start frame, the start frame for all of the
combinations cannot be specified. Set the frame number for the final frame to be used from the first buffer memory in order.
• When setting more than one combination, the start frame having the registered code in the same arrangement or the same
frame No. cannot be designated.
• Use the user frame No. of the following user frames to set the receive user frames.
Default registration frame No.: 1H to 3E7H
User frame No. registered in C24 flash ROM: 3E8H to 4AFH
User frame No. registered in C24 buffer memory: 8001H to 801FH
• Do not set the frame number of a user frame contains the additional code data by the transparent code for receiving
specification as a user frame for data reception using the nonprocedural protocol.
to
b0b15
(Default All 0H)
First frame (1st)
Buffer memory address
Un\G174/334
to to to
First
combination
First frame (4th)
Un\G177/337
Last frame (1st)
Un\G178/337
Fourth
combination
to to to
Last frame (4th)
Un\G181/341
Write 0H to 801FH