Mervis is slow

  • Re: Mervis reacting Slow

    I have installed the mervis runtine on the Raspberri Pi. I used version 2.05 of the IDE and the runtime. This Raspberri is mounted on an UNIPI board and 2 extra relay-boards connected via the I2C bus.
    The plc is running at 16.6 ms. the I2C enpoint is updated with 565 ms. It is almost the same as the one-wire temperature meter, 661 ms.
    I tried different I2C speeds, There was no change in reaction time.
    Is this End point speed normal? or must i use another runtime version?

    I included pictures of the runtime status and the configuration.
    All tips are welcome :)

    4_1479939849905_Unipi_Relays.PNG 3_1479939849905_Mervis Status.PNG 2_1479939849905_Mervis Status I2C settings.PNG 1_1479939849905_Emo-R8 board 2.PNG 0_1479939849905_Emo-R8 board 1.PNG

  • administrators

    Hello, how many I2C and 1Wire devices is in your application? The 1Wire is implemented using also the I2C bus so it is shared for both 1Wire and relays... However I tried 1 temp sensor and 1 emo-r8 with max 24ms at I2C and 46 at 1Wire.

  • @tomas_hora,

    I have one 1-wire temp -meter and 2 external I2C relay-cards (emorelay-boven and emorelay-beneden).
    These relay-cards and the unipi card are supplied by separate adapters, so the grounds are not coupled.
    Can this have influence on the speed?

    if in the program 2 relays are switched at the same time (each relay on a separate relay card), i can see that they are switched one after the other. at least 0.5 sec after each other.

    I would be nice if all relays could be switched in 100ms.

    I use the older mervis runtime (version 2.5) on a Rasberry Pi B+, is the last runtime faster or is there no difference is speeds.

    Kind regards,


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