General Description - Mitsubishi MELSEC-Q Series Programming Manual

1 GENERAL DESCRIPTION

1. GENERAL DESCRIPTION
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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 MELSAP3.
MELSAP3 can be used with the following CPU modules.
• Basic model QCPU whose serial number (first five digits) is 04122 or later
• High Performance model QCPU
• Process CPU
• Redundant CPU
• Universal model QCPU
• LCPU
• QnACPU
MELSAP3 conforms to the IEC Standard for SFC.
In this manual, MELSAP3 is referred to as SFC (program, diagram).
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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 MELSAP3 explained in this manual.
The SFC function that can be used by the Qn(H)CPU-A (A mode) is "MELSAP-II".
For MELSAP-II, refer to the "MELSAP-II (SFC) Programming Manual".
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