3/15/2020 9:19 PM | |
Joined: 3/11/2020 Last visit: 12/27/2023 Posts: 2 Rating: (0) |
Dear friends, I have a question about possible errors in the configuration of LOGO 8! and HMI panel (KTP400 basic). Logo is connected through the D-link switch with PC and KTP400 (ethernet cable). I have connected a few expansions modules to the main LOGO8! unit (see picture 1). The last one is AM2 RTD with PT100 sensor. Generally, I would like to control a few elements of a research equipment. I have started my job from a development of a simple algorithm to control temperature in the machine. I decided to build algorithm only for cooling. Control loop consist of PT100, one ON/OFF valve connected to cooling water inlet and heat exchanger. Valve position (ON/OFF) should be controlled manually (using switch on the HMI, network input) and automatically (PT100 and algorithm - please see a LogoSoft comfort file). I prepared visualization in Tia Portal v15 (please see attached zip file, screen 2). Everything worked fine (temperature readings on the logo and HMI were the same and correct). But when I have prepared on the visualization the switches connected to the network inputs (TRYB AUTOMATYCZNY, ZAWÓR_OTWÓRZ, ZAWÓR ZAMKNIJ) the temperature readings on the HMI decreased from 22 to 10 C degrees. Moreover, when I pushed (on the HMI) the button "ZAWÓR_OTWÓRZ" (manual control of Q1, valve ON/OFF) the temperature on the HMI increased to 16 C degrees. I don’t have any idea why temperature values are changing. It is worth to point out that the temperature on the LOGO8! module is still correct (with or without KAMAMI test plates). I would be very grateful for any advices. Best, Adalbert AttachmentSystem_post.zip (201 Downloads) |
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