Mitsubishi MELSEC Q Series Programming Manual page 576

COMRD(P)
Program Example
(1) The following program stores the comments set at D100 into the area starting from W0 as
ASCII when X1C is turned ON.
[Ladder Mode]
[Operation]
Comment at D100
Caution
(1) The processing completes after several scans.
(2) The COMRD(P)/PRC instruction is not executed if the start signal (execution command) of
the COMRD(P)/PRC instruction is turned ON before completion of the instruction (while
SM721 is ON). Execute the COMRD(P)/PRC instruction when SM721 is OFF.
(3) Two or more file comments cannot be accessed simultaneously.
(4) The following instructions cannot be executed simultaneously because they use SM721 in
common.
SP. FREAD
SP. FWRITE
PRC
COMRD
7-202
LINE A TARGET
Instruction ON During ON for One Scan After
Name Execution
Designated by instruction.
SM721
SM720
[List Mode]
Step Instruction
b8 b7
b15
49 (I)
W0
H
45 (E)
W1
H
41 (A)
W2
H
54 (T)
W3
H
52 (R)
W4
H
45 (E)
W5
H
20 (space)
W6
H
20 (space)
W7
H
W15 20 (space)
H
W16
ON after Abnormal Completion
Completion
(Device designated by instruction) + 1
None
Device
b0
4C (L)
H
4E (N)
H
20 (space)
H
20 (space)
H
41 (A)
H
47 (G)
H
54 (T)
H
20 (space)
H
20 (space)
H
00
H