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    DP820 Config PDF

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    khaledmangawy
    The DP820 module consists of 2 independent pulse counting channels that can interface with various transducer signals. It is used to totalize the pulse output of a flow transmitter to measure total flow. The module settings and logical connections are described to totalize the pulse count, measure frequency, scale the frequency measurement, and reset the pulse counter and overflow values.

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    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    DP820 Config PDF

    Uploaded by

    khaledmangawy
    159 views7 pages
    The DP820 module consists of 2 independent pulse counting channels that can interface with various transducer signals. It is used to totalize the pulse output of a flow transmitter to measure total flow. The module settings and logical connections are described to totalize the pulse count, measure frequency, scale the frequency measurement, and reset the pulse counter and overflow values.

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    Original Title

    DP820 Config.pdf

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    The DP820 module consists of 2 independent pulse counting channels that can interface with various transducer signals. It is used to totalize the pulse output of a flow transmitter to measure total flow. The module settings and logical connections are described to totalize the pulse count, measure frequency, scale the frequency measurement, and reset the pulse counter and overflow values.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    159 views7 pages

    DP820 Config PDF

    Uploaded by

    khaledmangawy
    The DP820 module consists of 2 independent pulse counting channels that can interface with various transducer signals. It is used to totalize the pulse output of a flow transmitter to measure total flow. The module settings and logical connections are described to totalize the pulse count, measure frequency, scale the frequency measurement, and reset the pulse counter and overflow values.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 7

    DP820 Configuration Manual

    DP820 Incremental Pulse Counter Module


    Configuration Manual

    Description
    DP820 module consists of 2 identical and independent channels for pulse and frequency
    measurement.

    • 2 channels
    • Interface with RS422 , 5V , 12V , 24V and 13mA transducer signal
    • Simultaneous pulse and frequency measurement
    • 29 bit bidirectional counter for pulse count by accumulation
    • Frequency measurement of 0.25 Hz to 1.5 MHz

     
    DP820 Configuration Manual

    Pulse Based Totalizer for Flow Transmitter


    The settings of the DP820 are as shown below:

    • Pulse mode selection use A:UP/B:Down


    • The Flow transmitter pulse output is totalized in the Pulse counter
    • Hence the following settings were made in the flow transmitter o 1 pulse per 0.01 kg
    (Based on the Accuracy) o 15 ms pulse width (Based on max pulses per second
    /Frequency output of Flow transmitter)

    The parameter connections are as follows:-

     
    DP820 Configuration Manual

    • The counter value in channel 5 and 6 shall be the totalized flow from the pulse input.
    • The variable connected in the channel 5 times the unit per pulse shall be totalizer output.
    • For Eg:- FT_83901_P * 0.01 = FIQ_83901
    • The frequency value input shall be obtained in Channel 17 and 18

     
    DP820 Configuration Manual

    • The range for frequency channel can be obtained from the following formula :-

    • Frequency can only be scaled and hence following formula shall give us the scaled input
    to which frequency can be estimated.
    o Min = A1 + (A2 – A1)/(F2 – F1) * (Fmin– F1)
    Max = A2 + (A2 – A1)/(F2 – F1) * (Fmax – F2) o
    A1 = minimum value of the process unit
    A2 = maximum value of the process unit
    F1 = Input frequency at A1
    F2 = Input frequency at A2
    Fmin = Input frequency at 0% in the scaling algorithm = 0 Hz PROFIBUS
    CI830 and -1.5 MHz for ModuleBus and PROFIBUS CI801 and CI840
    Fmax = Input frequency at 100% in the scaling algorithm = 1.5Mhz
    • The Flow transmitter must be configured for the frequency input and frequency for
    Kg/min. flow should be fixed.
    • The frequency value from the channel must be then used to totalize the flow in the logic.
    • For Eg.: For a flow of 1kg/min if the frequency of 10 Hz is configured in the Flow
    transmitter, then The range of the frequency channel be -150000.0 to 150000.0 The
    Process connections are as follows for 8 channel TB used with TU810 :-

     
    DP820 Configuration Manual

     
    DP820 Configuration Manual

    • Connect the two cables from the frequency output / pulse output of the Flow transmitter
    to the 1st TB for channel 1 and 5th TB to use channel 2 of DP820 module.
    • Channel 1 of DP820 totalized value is obtained in the Counter value CH1 (Hardware
    channel 5 in Connections [FT_83901_P])
    • Channel 2 of DP820 totalized value is obtained in the Counter value CH2 (Hardware
    channel 6 in Connections [FT_83902_P])

    Logical Expressions
    The Counter value CH1 can be reset using the following set of instructions:

    • Reset pulse Counter Condition [ Channel 31 ] = 1


    • Reset pulse Counter [Channel 29 ] = True

     
    DP820 Configuration Manual

    • The counter Value CH1 [Channel 5] will become 0


    • Pulse Counter reseted [channel 13] shall become true
    • Ack. pulse counter reseted = 1
    • Then the pulse counter reseted shall automatically become false
    • Reset pulse Counter Condition = 0
    • Reset pulse Counter = False
    • Counter Overflow [Channel 7] shall be true when the counter is overflow.
    • To reset the overflow the value of reset counter overflow [Channel 21] must be made
    true.

    Reference

    • 3BSE020924-510 Modules and Termination Units.


    • Control Builder Help – DP820.

     

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