7.11 String Processing Instructions
7.11.7 Reading device comment data
7-179
7
APPLI
C
A
T
IO
N
INSTRUCTIONS
COMRD
COMRD
C
aut
i
on
(1) QCPU completes the processing after several scans.
(2) The COMRD(P) or PRC instruction is not executed if the start signal (execution command)
of the COMRD(P) or PRC instruction is turned ON before completion of the instruction (while
SM720 is ON). Execute the COMRD(P) or 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.
Instruction name
ON during
execution
ON for one scan after
completion
ON after abnormal completion
SP_FREAD
SP_FWRITE
SM721
Specified by instruction
(Device specified by instruction) + 1
PRC
COMRD(P)
SM720
None
Summary of Contents for MELSEC Q Series
Page 1: ...Structured Programming Manual Mitsubishi Programmable Controller QCPU Common Instructions ...
Page 2: ......
Page 14: ...A 12 MEMO ...
Page 340: ...6 178 MEMO MTR ...
Page 708: ...7 368 MEMO ...
Page 776: ...8 68 MEMO ...
Page 796: ...9 20 MEMO ...
Page 804: ...App 8 MEMO ...
Page 812: ...Index 8 MEMO ...
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