111
C-mode Command Details Section 4-3
Execution Conditions
End Codes An end code of 14 (format error) will be returned if the length of the command
is incorrect and an end code of 15 (entry number data error) will be returned if
the specified words exceed the data area boundaries, or are not specified in
BCD, or if the number of words to read is 0.
4-3-7 DM AREA READ – – RD
Reads the contents of the specified number of DM words starting from the
specified word (D00000 to D09999).
Command Format
Response Format
Limitations The DM Area is comprised of D00000 to D32767, but the range that can be
read by this command is D00000 to D09999.
The text portion of the response’s first frame can contain up to 30 words. If
more than 30 words are read, the data will be returned in multiple frames.
In the second and later frames, the text portion of the response can contain
up to 31 words.
The INITIALIZE and ABORT commands can be sent instead of the delimiter
for multiple responses for this command. If other commands are sent, they will
be treated as delimiters.
Execution Conditions
End Codes An end code of 14 (format error) will be returned if the length of the command
is incorrect and an end code of 15 (entry number data error) will be returned if
Commands Responses PLC Mode UM Area
Single Multiple Single Multiple RUN MON PROG Write-protected Read-protected
OK No OK OK OK OK OK OK OK
End code (Hex) Contents
00 Normal completion
13 FCS error
14 Format error
15 Entry number data error
18 Frame length error
21 Not executable due to CPU Unit CPU error.
@
FCS
R
D
x 10
1
x 10
0
x 10
3
x 10
2
* ↵
x 10
1
x 10
0
x 10
3
x 10
2
x 10
1
x 10
0
Unit No.
(BCD)
Header
code
TerminatorBeginning word
(0000 to 9999)
No. of words
(0001 to 9999)
@RD
x 10
1
x 10
0
x 16
1
x 16
0
* ↵
x 16
3
x 16
2
x 16
1
x 16
0
FCS
Unit No.
(BCD)
End codeHeader
code
Read data (1 word)
Read data (for number of words read)
Terminator
Commands Responses PLC Mode UM Area
Single Multiple Single Multiple RUN MON PROG Write-protected Read-protected
OK No OK OK OK OK OK OK OK
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