Recent content by hewking

  1. H

    What device shall i use to measure 400V Voltage which can change frequency between 10-200hz?

    hi Siemens does not sell power meters covering that range. PAC3220 can only do typical range 40-60hz The voltage is coming from the transformer which is stepped down by the voltage transfomer to 400V. Transformer is fed by the VFD with the sine filter so the measured voltage is sine rather than...
  2. H

    What is the purpose of the HMI/Scada Tag - how come rockwell scada does not need it and use a single point of truth?

    hi All Fundamental question so please bear with me. I understand the concept of Siemens Wincc HMI tag as a memory structure to hold many properties related to the tag so tag it is really "structure of structures" to contain all these details which is much more than just address to store the raw...
  3. H

    Are macbook pro used in automation industry ?

    hi All Might sound ridiculous but please bear with me. I heard that apple computers can run windows virtual machines much faster that standard PCs and some people use it in automatin. I would like to verify that claim: has anybody from this forum used macbook pro (what model was it) with...
  4. H

    Why VFD drives use INT or DINT as speed reference instead of real variables?

    hi All Any chance somebody explains me why real numbers are not used in VFD drives speed reference etc? So instead of sending sending 90.9 percentage of speed i would have to multiple it by 10 and send 909 which is then converted by the drive itself? Why floating point arithmetic in not used in...
  5. H

    What are different ways to extract data from various PLCs?

    I feel like i am asking very wide question but it will be beneficial for many people to organise this huge chunk of automation knowledge. When answering this question can you please consider 3 scenarios: A PLC brand e-g. Siemens, Mitsubishi, Allen Bradley, Beckhoff, others B Ways to extract...
Top