Mitsubishi Electric MELSEC-Q Series Programming Manual page 143

• Executing S(P).SFCTCOMR instruction, SM735 of the special relay (SFC comment readout instruction executing flag)
turns ON. Confirms whether or not S(P).SFCTCOMR instruction is executed by SM735.
• In case comments are not set into active steps, "2DH(-)" is stored to the comment area (word length of 32 characters).
• Read comments are stored in ascending order of the step No.
• Comments are read from the comment file specified when S(P).SFCTCOMR is executed.
• Comments to read with S(P).SFCTCOMR, comments of transition condition associated with active steps of
S(P).SFCTCOMR instruction is executed. Because of this, step comments to be activated after S(P).SFCTCOMR
execution cannot be read.
*2 As coil retention step at a status of retaining coil output or operation retention step retaining operation condition (without transition
check) is not active step, a comment cannot be read.
• Reading comment is performed at END processing for a scan that has executed S(P).SFCTCOMR instruction. The number
of comments specified at n3 is read per END processing. Comments that are not read per END processing are followed to
the next END processing. Reading comments for transition conditions (maximum: the number specified at n2) associated
with active steps is completed, the device specified at (d2) turns ON for 1 scan.
For the Universal model QCPU, when the standard ROM is selected in "Corresponding Memory" in
"Comment File Used in a Command" in the PLC File tab of the PLC parameter dialog box, the number of
comments read at END processing is determined by the system.
*2
with when
4 SFC PROGRAM CONFIGURATION
4.8 SFC Comment Readout Instruction
4
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