Chapter 1 General Description - Mitsubishi Electric MELSEC-Q Series Programming Manual

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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.
MELSAP-L conforms to the IEC Standard for SFC.
• 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
In this manual, MELSAP-L is referred to as SFC (program, diagram).
• 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.
Page 117 Step Transition Watchdog Timer
Page 119 SFC Operation Mode Setting
• The QCPU-A (A mode) cannot use MELSAP-L explained in this manual.
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