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    jaroslav_sobota

    @jaroslav_sobota

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    Latest posts made by jaroslav_sobota

    • RE: Hydraulic Press project on Neuron M203 - beginner needs help

      @r3sist said in Hydraulic Press project on Neuron M203 - beginner needs help:

      I just need anything to notify the operator directly on the machine about current pressure , and let him adjust this one pressure setpoint variable. It could even be a segment lcd.

      If segment LCD is all you need, maybe something like this could do the trick:
      https://en.papouch.com/tds-rs485-7-segment-led-display-p1922/

      You can connect it via RS485 and communicate using Modbus RTU.

      posted in Mervis
      J
      jaroslav_sobota
    • RE: Hydraulic Press project on Neuron M203 - beginner needs help

      I guess that @r3sist was trying to cover two separate topics:

      • using the 3.5" screen as local HMI (or operator screen, depending on the preferred terminology)
      • using DIs to manipulate some variable(s) in the algorithm, e.g. maximum and minimum for pressure

      Am I right?

      Jaroslav

      posted in Mervis
      J
      jaroslav_sobota
    • RE: Should I use Analog or Digital input to read Vacuum pressure?

      A sensor with digital output will only give you information whether the pressure is below or above given threshold. You can connect it to digital input of UniPi. You have to decide whether this is sufficient for your project or not.

      Jaroslav

      posted in Official EVOK API
      J
      jaroslav_sobota
    • RE: 4RO 4DI expansion module

      Did you edit the /etc/owfs.conf file? It should contain the following:

      !server: server = 127.0.0.1:4304
      allow_other
      server: port = 127.0.0.1:4304
      server: i2c=ALL:ALL
      timeout_volatile = 2
      

      You will need to restart owserver for these settings to have effect. Or reboot the Raspberry Pi.

      Can you post here the output of the owdir command? Please start with only 1 expansion module.

      Jaroslav

      posted in REX
      J
      jaroslav_sobota
    • RE: Industrial automation project

      For sure this is possible, it is called a distributed control system. The software will be more complex (e.g. you must handle network communication problems correctly) but you will not have a single point of failure. When the Local Control Unit looses connection with the Master Control Unit, it will still work locally, you can even define an emergency or fail-safe mode.

      The master control unit needs no I/O, it can be a plain Raspberry Pi. Or you can use 1 master/local unit and 4 local units.

      For communication, I would use Modbus TCP.

      Jaroslav

      posted in Installations
      J
      jaroslav_sobota
    • RE: Siemens LOGO 8

      Probably too late for the party but still I'd like to mention that this is possible with REX Control System.

      Jaroslav

      posted in Mervis
      J
      jaroslav_sobota
    • RE: Industrial automation project

      Hi Merv,
      depends on what "large" means for you. If 10=large then we did: http://unipi.technology/customer-reference-unipi-likes-rex-controls/

      Your project is very nice, looking forward to hearing more about it!

      Jaroslav

      posted in Installations
      J
      jaroslav_sobota
    • RE: Extreme switching of UniPi relays

      In the last days we received several questions regarding the cycle time (or sampling rate) of the REX Control System on Raspberry Pi. So we decided to use the UniPi board for a video demonstration.

      Don't try this with your UniPi: https://youtu.be/X89RLSTKrXM

      posted in REX
      J
      jaroslav_sobota
    • Extreme switching of UniPi relays

      In the last days we received several questions regarding the cycle time (or sampling rate) of the REX Control System on Raspberry Pi. So we decided to use the UniPi board for a video demonstration.

      Don't try this with your UniPi: https://youtu.be/X89RLSTKrXM

      posted in REX
      J
      jaroslav_sobota
    • RE: Community forum dedicated to REX Control System

      A community forum focused on the REX Control System has been launched.
      You may join us at http://www.rexcontrols.com/forum.
      Looking forward to meeting you there!

      Nevertheless, I'll keep my eye on this forum as well.

      posted in REX
      J
      jaroslav_sobota