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MELSEC-Q
1 GENERAL DESCRIPTION
1. GENERAL DESCRIPTION
SFC, an abbreviation for "Sequential Function Chart", is a control specification description format
in which a sequence of control operations is split into a series of steps to enable a clear
expression of the program execution sequence and execution conditions.
This manual describes the specifications, functions, instructions, programming procedures, etc.
used to perform programming with an SFC program using MELSAP-L.
MELSAP-L can be used with the following CPU modules.
• Basic model QCPU (first five digits of serial No. are 04122 or later)
• High Performance model QCPU
• Redundant CPU
• Process CPU
• Universal model QCPU
MELSAP-L conforms to the IEC Standard for SFC.
In this manual, MELSAP-L is referred to as SFC (program, diagram).
POINT
(1) The following functions cannot be executed if a parameter that sets the "high
speed interrupt cyclic interval" is loaded into a High Performance model QCPU
of which the first 5 digits of the serial number are "04012" or later.
• Step transition watch dog timer (see Section 4.6)
• Periodic execution block setting (see Section 4.7.4)
(2) The Qn(H)CPU-A (A mode) cannot use MELSAP-L explained in this manual.
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