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C-mode Command Details Section 4-3
The response’s first frame will contain 30 words of program data. The second
and later frames will contain 31 words except for the last frame, which will
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.
4-3-33 PROGRAM WRITE – – WP
Writes to the CPU Unit user’s program area the machine language program
transmitted from the host computer. The contents are written as a block, from
the beginning.
Command Format
Response Format
Limitations The command cannot be executed while the UM Area is write-protected.
Data is written from the beginning of the UM Area to the maximum limit of the
program area.
An error will not occur if the command attempts to write program data beyond
the maximum size of the program area.
The program data can be divided into multiple frames in units of 4 characters.
Execution Conditions
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 No
End code (Hex) Contents
00 Normal completion
13 FCS error
14 Format error
18 Frame length error
19 Not executable
21 Not executable due to CPU Unit CPU error.
23 User memory protected
@WP
x 10
0
x 10
1
x 16
1
x 16
0
↵*
Unit No. (BCD)
Header
code
Complete program
TerminatorFCS
@WP
x 10
0
x 10
1
x 16
1
x 16
0
↵*
Unit No. (BCD)
Header
code
End code TerminatorFCS
Commands Responses PLC Mode UM Area
Single Multiple Single Multiple RUN MON PROG Write-protected Read-protected
OK OK OK No No No OK No OK
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