Factory Automation

MELSEC-F series High-Speed Counting

    Using high speed counters, high speed signals from encoder ans sensors can be counted.
    Because FX PLC has built-in high performance high speed counters, high speed control is possible with a simple program. A high speed counter block with hardware comparator is also available.

    High speed counter block/adapter

    Model
    (Number of channels)     		Type Highest response
    frequency     		Hardware comparison
    output function     		2-phase counter
    edge count function     		Applicable FX PLC
    FX
    3S     		FX
    3G     		FX
    3U     		FX
    3GC     		FX
    3UC
    FX2N-1HC
    (1 ch)
    		1-phase
    1-count     		Max. 50 kHz ○ - × × ○
    Max.
    8 units     		× *2*3
    ○
    Max.
    8 units
    1-phase
    2-count     		Max. 50 kHz
    2-phase
    2-count     		1 edge count:
    Max. 50 kHz
    2 edge count:
    Max. 25 kHz
    4 edge count:
    Max. 12.5 kHz     		○
    FX3U-2HC
    (2 ch)
    		1-phase
    1-count     		Max. 200 kHz ○ - × × ○
    Max.
    8 units     		× *2
    ○
    Max.
    4 units
    1-phase
    2-count     		Max. 200 kHz
    2-phase
    2-count     		1 edge count:
    Max. 200 kHz
    2 edge count:
    Max. 100 kHz
    4 edge count:
    Max. 50 kHz     		○
    FX2NC-1HC
    (1 ch)
    		1-phase
    1-count     		Max. 50 kHz ○ - × × × × *3
    ○
    Max.
    8 units
    1-phase
    2-count     		Max. 50 kHz
    2-phase
    2-count     		1 edge count:
    Max. 50 kHz
    2 edge count:
    Max. 25 kHz
    4 edge count:
    Max. 12.5 kHz     		○
    FX3U-4HSX-ADP
    (4 ch)
    		1-phase
    1-count     		Max. 200 kHz × ○ × × *1
    ○
    Max.
    2 units     		× ×
    1-phase
    2-count     		Max. 200 kHz
    2-phase
    2-count     		1 edge count:
    Max. 100 kHz
    4 edge count:
    Max. 100 kHz
    • *1When used together with analog or communication adapters, function expansion board is required.
    • *2When connecting to FX3UC, FX2NC-CNV-IF or FX3UC-1PS-5V is required.
    • *3FX3UC-32MT-LT(-2): 7 units. FX3UC-**MT/D, FX3UC-**MT/DSS, FX3UC-16MR/D(S)-T: 8 units.

    Built-in high speed counter function (high speed input adapter function)

    FX3S Series PLC

    Type Counter No.
    Highest
    response
    frequency *     		Max. response
    frequency when
    high speed processing
    instruction is used *     		Supported high speed processing instructions High
    speed
    counter
    move     		2 phase
    counter
    multi-
    count
    function     		FX3U-4HSX-ADP
    max. response
    frequency
    (FX3U only)
    When
    high speed
    comparison
    SET/RESET
    is used     		When
    high speed
    band
    comparison
    HSZ
    is used     		High
    speed
    comparison
    SET     		High
    speed
    comparison
    RESET     		High
    speed
    band
    comparison     		Counter
    interrupt     		High
    speed
    table
    comparison
    1-
    phase
    1-
    count     		C235,
    C236,
    C241
    Max. 2 pts：
    Max. 60 kHz     		overall frequency
    60 kHz     		○ ○ ○ × × × - ×
    C237 to C240,
    C242 to C245
    Max. 4 pts：
    Max. 10 kHz
    1-
    phase
    2-
    count     		C246
    Max. 1pt：
    Max. 60 kHz
    C247,
    C248,
    C248(OP)
    C249,
    C250
    Max. 2 pts：
    Max. 10 kHz
    2-
    phase
    2-
    count     		C251
    Max. 1pt：
    Max. 30 kHz     		×
    C252,
    C253,
    C253(OP)
    C254,
    C255
    Max. 2 pts：
    Max. 5 kHz
    • *Regarding high speed counter reponse frequency, the overall frequency is limited. For details, please refer to the programming manual.

    FX3G, FX3GC Series PLC

    Type Counter No.
    Highest
    response
    frequency *     		Max. response
    frequency when
    high speed processing
    instruction is used *     		Supported high speed processing instructions High
    speed
    counter
    move     		2 phase
    counter
    multi-
    count
    function     		FX3U-4HSX-ADP
    max. response
    frequency
    (FX3U only)
    When
    high speed
    comparison
    SET/RESET
    is used     		When
    high speed
    band
    comparison
    HSZ
    is used     		High
    speed
    comparison
    SET     		High
    speed
    comparison
    RESET     		High
    speed
    band
    comparison     		Counter
    interrupt     		High
    speed
    table
    comparison
    1-
    phase
    1-
    count     		C235,
    C236,
    C238,
    C239,
    C241
    Max. 4 pts：
    Max. 60 kHz     		overall frequency
    60 kHz     		○ ○ ○ × × × - ×
    C237,
    C240,
    C242 to C245
    Max. 2 pts：
    Max. 10 kHz
    1-
    phase
    2-
    count     		C246,
    C248(OP)
    Max. 2 pts：
    Max. 60 kHz
    C247 to C250
    Max. 2 pts：
    Max. 10 kHz
    2-
    phase
    2-
    count     		C251,
    C253(OP)
    Max. 2 pts：
    Max. 30 kHz     		×
    C252 to C255,
    C254(OP)
    Max. 2 pts：
    Max. 5 kHz
    • *Regarding high speed counter reponse frequency, the overall frequency is limited. For details, please refer to the programming manual.

    FX3U, FX3UC Series PLC

    Type Counter No.
    Highest
    response
    frequency *     		Max. response
    frequency when
    high speed processing
    instruction is used *     		Supported high speed processing instructions High
    speed
    counter
    move     		2 phase
    counter
    multi-
    count
    function     		FX3U-4HSX-ADP
    max. response
    frequency
    (FX3U only)
    When
    high speed
    comparison
    SET/RESET
    is used     		When
    high speed
    band
    comparison
    HSZ
    is used     		High
    speed
    comparison
    SET     		High
    speed
    comparison
    RESET     		High
    speed
    band
    comparison     		Counter
    interrupt     		High
    speed
    table
    comparison
    1-
    phase
    1-
    count     		C235 to C240
    Max. 6 pts：
    Max. 100 kHz     		40 kHz 40-
    (Number
    of times of
    use of instruction)     		○ ○ ○ ○ ○ ○ - 200 kHz
    C244(OP),
    C245(OP)
    Max. 2 pts：
    Max. 10 kHz     		10 kHz 200 kHz
    C241 to C245
    Max. 3 pts：
    Max. 40 kHz     		40 kHz -
    1-
    phase
    2-
    count     		C246,
    C248(OP)
    Max. 2 pts：
    Max. 100 kHz     		40 kHz 200 kHz
    C247 to C250
    Max. 2 pts：
    Max. 40 kHz     		40 kHz -
    2-
    phase
    2-
    count     		C251,
    C253
    Max. 2 pts：
    Max. 50 kHz
    (1 edge count, 4 edge count)     		1 edge count 40 kHz ○ 100 kHz
    4 edge count 10 kHz (40-
    Number
    of times of
    use of
    instruction)÷4
    C252,
    C253(OP),
    C254,
    C255
    Max. 2 pts：
    Max. 40 kHz     		1 edge count 40 kHz 40-
    (Number
    of times of use of instruction)     		-
    4 edge count 10 kHz (40-
    Number
    of times of
    use of
    instruction)÷4
    • *Regarding high speed counter reponse frequency, the overall frequency is limited. For details, please refer to the programming manual.

    Variety of functions