Contents Of The Data Designation Items - Mitsubishi MELSEC Q Series Reference Manual

4.2 Contents of the Data Designation Items

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Each frame format contains several data items for data transmission, as defined by the
control procedure. Some of the data items of the QnA compatible 2C, 3C and 4C
frames are common, but not all. The following describes the data items unique to the
QnA compatible 2C.
POINT
The data items other than those mentioned in this section are designated in the
same way as when communicating using QnA compatible 3C/4C frames.
For more details, refer to Section 3.1.6.
For the "message wait" time for data communication, refer to REMARKS in
Section 3.1.6 (11).
(1) Frame ID number
"FB" should be designated as the frame ID number when communicating in QnA
compatible 2C frames.
(2) Commands
The function to be executed is designated by one of the commands from "1 to 9"
(refer to Section 4.3), which is transmitted as a one-digit ASCII code.
(3) Character areas (areas A, B and C)
The character areas use the same designation method and contents as those for
the communication using the QnA compatible 3C/4C frames. They are
determined by the commands transmitted from the external device.
The following table shows the correspondence between the commands for the
QnA compatible 2C and QnA compatible 3C/4C frames for which the designation
method and contents of character areas are the same.
Command
Bit units
Batch read
Word units
Bit units
Batch write
Word units
Random read Word units
Test Bit units
(Random write)
Word units
Monitor data registration Word units
Monitor Word units
Designate the character areas for the command to be used according to the
instruction given in Section 3.3.
4 WHEN COMMUNICATING USING THE QnA COMPATIBLE 2C FRAMES
QnA compatible 2C
frame command
1
2
3
4
5
6
7
8
9
QnA compatible 3C/4C frame commands
corresponding to the command at the left
Command Subcommand
0401
0401
1401
1401
0403
1402
1402
0801
0802
0001
0000
0001
0000
0000
0001
0000
0000
0000
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