User Frame Types And Registration; User Frame On-Demand Data Transmission And Buffer Memory Used - Mitsubishi MELSEC L Series User Manual

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.
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 Chapter 9.
To register a user frame from an external device, first refer to Chapter 9 and check the
precautions, etc., then register the user frame with the function described in the
MELSEC-Q/L 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
(2) Buffer memory used and on-demand data list
Address
CH1 CH2
A9 (169) 149 (329)
H H
AA (170) 14A (330)
H H
On-demand user
frame designation
AB (171) 14B (331)
H H
AC (172) 14C (332)
H H
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The following describes the transmission of on-demand data using user frames.
1) 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-Q/L MELSEC
Communication Protocol Reference Manual.
2) 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.
1) 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.
Name
First frame No.
designation
Last frame No.
designation
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.
1 to 3E7 (1 to 999)
H H
3E8 to 4AF (1000 to 1199)
H H
8001 to 801F (-32767 to -32737) : User frame (registered in buffer memory)
H H
10 ON-DEMAND DATA COMMUNICATIONS USING USER FRAMES
Designates the No. of the user frame that is transmitted as
the first frame.
(1st)
0 : Do not transmit
H
Others : Transmit
Other than 0 is always designated for the 1st frame.
(2nd)
When designating the 1st frame, the 2nd frame can
also be designated.
Designates the No. of the user frame to be transmitted as
(1st)
the last frame.
0 : Do not transmit
H
Others : Transmit
(2nd)
When designating the 1st frame, the 2nd frame can
also be designated.
: Default registration frame
: User frame (registered in flash ROM)
Description
1
( )
1
( )
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