Mitsubishi MELSEC Q Series Programming Manual page 575

(2) If no comment has been registered for the device specified by
comment range setting is made, all of the characters for the comment are processed as
"20 " (space).
H
(3) The device number plus 1 where the final character of
ON/OFF status of SM701 (number of characters to output select signal).
When SM701 is OFF
When SM701 is ON
(4) When a comment is read, SM720 turns ON for one scan after the instruction is completed.
SM721 turns ON during the execution of the instruction.
While SM721 is ON, the COMRD(P) instruction cannot be executed. If the attempt is made,
no processing is performed.
1. The device comment used in the COMRD(P) instruction uses a comment file
2. Set the comment file used for the COMRD(P) instruction in "PLC file setting" in
3. The COMRD(P) instruction cannot be executed during the interrupt program.
Operation Error
(1) In any of the following cases, an operation error occurs, the error flag (SM0) turns ON, and
an error code is stored into SD0.
• The comment is not registered to the device number specified by
• The device number specified by
• The device specified by
(For the Universal model QCPU, LCPU.)
: Does not change
: Stores "0"
stored in a memory card and the standard ROM.
Comment files stored in the program memory cannot be used.
the PLC parameter dialog box. If the comment file to be used is not set in the
PLC file setting, device comments cannot be output with the COMRD(P)
instruction.
No operation if executed.
D
exceeds the range of the corresponding device.
D
S
is stored differs depending on the
D
is not a word device.
COMRD(P)
despite the fact that the
. (Error code: 4100)
S
(Error code: 4101)
(Error code: 4101)
7-201
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