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7 APPLICATION INSTRUCTIONS
7.11 Character String Processing Instructions
• The processing completes after several scans.
• 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.
• Two or more file comments cannot be accessed simultaneously.
• The following instructions cannot be executed simultaneously because they use SM721 in common.
• For the High-speed Universal model QCPU and LCPU, when a comment file stored on an SD memory card is used, this
instruction cannot be executed while SM606 (SD memory card forced disable instruction) is ON. If the instruction is
executed, the command will be ignored.
Instruction Name ON During Execution ON for One Scan After
Completion
ON after Abnormal
Completion
SP.FREAD
SP.FWRITE
SM721 Designated by instruction. (Device designated by instruction) +
1
PRC
COMRD
SM720 None
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