User`s manual

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10.2 User Frame Types and Registration
Data communications using user frames can be performed by registering the user frames to the Q series C24 from an
external device and the programmable controller CPU.
Page 220, CHAPTER 9 explains the types of user frames and the data that can be used.
To register a user frame from the programmable controller CPU, refer to Page 220, CHAPTER 9.
To register a user frame from an external device, first refer to Page 220, CHAPTER 9 and check the precautions, etc.,
then register the user frame with the function described in the MELSEC Communication Protocol Reference Manual.
10.3 User Frame On-Demand Data Transmission and Buffer
Memory Used
This section describes user frame on-demand data transmission processing and the on-demand data list by user
frame setting to the Q series C24 buffer memory.
(1) Transmission of on-demand data using user frames
The following describes the transmission of on-demand data using user frames.
• Programmable controller CPU processing
• Before issuing a transmission request to the Q series C24, set the No. of the user frame registered in the
Q series C24 to the buffer memory shown in the table below.
• Except for the above, the programmable controller CPU execution procedure and control procedure are
the same as transmitting on-demand data without user frames described in the MELSEC Communication
Protocol Reference Manual.
• External device processing
• When the external device receives the user frame transmitted by the Q series C24 as the first frame,
receive it as on-demand data.
(2) Buffer memory used and on-demand data list
• Buffer memory used
During on-demand data transmission by user frame, the user frame to be transmitted is designated in the buffer
memories shown below.
*1 Designates the registration No. (shown below) of the user frame to be transmitted from among the user frames
registered in the Q series C24.
1H to 3E7H (1 to 999): Default registration frame
3E8H to 4AFH (1000 to 1199): User frame (registered in flash ROM)
8001H to 801FH (-32767 to -32737): User frame (registered in buffer memory)
Address
Name Description
CH1 CH2
A9H(169) 149H(329)
On-demand user
frame designation
First frame No.
designation
(1st) Designates the No. of the user frame that is transmitted as the first
frame.
0H: Do not transmit
Others: Transmit
*1
(Other than 0 is always designated for the 1st frame. When
designating the 1st frame, the 2nd frame can also be designated.)
AAH(170) 14AH(330) (2nd)
ABH(171) 14BH(331)
Last frame No.
designation
(1st) Designates the No. of the user frame to be transmitted as the last
frame.
0H: Do not transmit
Others: Transmit
*1
(When designating the 1st frame, the 2nd frame can also be
designated.)
ACH(172) 14CH(332) (2nd)