Mitsubishi MELSEC Q Series Programming Manual page 831

(3) The user message is displayed when the UMSG instruction command is rising.
If the string is changed while the command is on, then the modified user message will
appear in the display unit.
(4) The string specified by the UMSG instruction is displayed upon END processing. If two or
more UMSG instructions are executed, then the last UMSG instruction executed before the
END is valid. If two or more programs are running, then the last UMSG instruction to be
executed is valid.
(5) This instruction is not processed if it is run when no display unit is mounted.
(6) If the "ESC" key on the display unit is pressed while a user message is being displayed, the
displayed message will disappear.
To display the message again, execute "User Message" from the menu screen on the
display unit.
(7) If a NULL code (00
currently being displayed will disappear.
The procedure for specifying a NULL code (00
See the MELSEC-L CPU Module User's Manual (Function Explanation, Program Fundamentals)
for details about the display unit.
Operation Error
(1) The following will cause a computation error, setting the error flag (SM0), and storing an
error code in SD0.
• When there is no NULL code (00
device number specified by
• When more than 128 single-byte characters are specified in the
) is specified as the argument to this instruction, then any message
H
Specifying a NULL code(00 )
H
) within the range of the target device following the
H
S
) in the instruction parameter is as follows.
H
string
S
1
2
3
4
6
6
7
8
(Error code: 4101)
(Error code: 4100)
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