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2rlp

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Posts posted by 2rlp

  1. Hi,

    I have an amplifier which outputs 0 to 5 V depending on the sensed condition. However due to an oversight, I had ordered EX DI16 AI3 TO16 module. This module has 3 Analog inputs of 0 to 20 mA. The amplifier specs state that its output impedance is 100 Ohm, the input impedance of the analog input is 190 Ohms. So on connecting the output of the amplifier to the analog input, I get a value of around 19 mA (978) counts in MI corresponding to the analog input. Is scaling the counts such tha 978 corresponds to 1023, the only solution? Or can the input be made to receive 20 mA?

    Thanks

    Ron

  2. Hi,

    I need a system with fast scanning of 10 nos. 12 bit analog inputs. My hardware is configured as V570 + EX-DI16A3-TO16 + IO-DI16A3-TO16 + IO-DI16A3-TO16 + IO-DI16A3-TO16 + IO-AI4AO2 + IO-ATC8.

    My question is " will changing the configuration to V570 + EX-DI16A3-TO16 + IO-AI4AO2 + IO-ATC8+ IO-DI16A3-TO16 + IO-DI16A3-TO16 + IO-DI16A3-TO16, improve the scanning ".

    Thanks & regards

    Ron

  3. Hi Ron,

    I think the "bottle neck" here is not the PLC scan, but the conversion time of analog inputs.

    Which hardware you're using for analog inputs? Did you check the conversion method and conversion time for the relevant hardware unit?

    The scan time of te controller itself depends not only from the numbers of inputs and outputs, but the length of the program and type of operations. HMI also can affect a little the scan time.

    Usually gthe "normal" scan time for enhanced Vision OPLC is in range 3-7 ms.

    Thanks Emil,

    I will be using 2 X IO AI8 in the fast mode. It mentions 25mSec per input. What does it mean? 8 inputs would take 200mSec?

    Pl reply

    Ron

  4. Hi,

    I will be using V1040 with around 64 Inputs, 64 Outputs & 12 Analog Inputs. The actual usage would be around 30 Inputs, 24 Outputs & 8 Analog Inputs.

    The process involves comparing the 8 analog inputs and carrying out the associated procedure. The analog inputs are connected to sensors which have an output response time of 75 microseconds in the 0 to 10 V range.

    What will be the PLC's scan time for such a configuration?

    Pl comment.

    Ron

  5. Hi Emil,

    One thing I have found with Unitronics and Visilogic when introducing it to new customers. If I introduce it to someone with little or no PLC experience, they tend to pick it up easier because they don't have preconceived expectations. On the other side, introducing it to people with a lot of PLC experience often doesn't go so well. You hear phrases such as, "you mean I can't do this", or "this isn't very intuitive". It's a tougher sell, because they are already aware of things that they can do with other products that they can't do with Visilogic.

    Hi,

    This is very true!

    Ron

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