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About Transistor

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  1. I'm testing installation of a custom-built machine. The equipment is at room temperature of about 19°C for a couple of weeks but the PLC is reading 25 to 29°C from the J-type thermocouple inputs. I suspect the machine builder has used copper cable to wire the thermocouples back to the I/O point. He has also used what appear to be regular M12 connectors to make the connection. Configuration of the input module does not appear to be correct. We're in 50Hz-land. I can't find any wiring instructions in the A-B documentation but I suspect that we should at least be using compensating cable and proper J-type connectors near the heater zones. Any pointers?
  2. Good catch (on the missing assignment ':'). Today I've been programming in Codesys STL, VBA and Python. I got mixed up! Fixed.
  3. This isn't urgent but a TIME value is failing a comparison test for me. t_delay : TIME; // Declaration ----- IF t_delay <= 0 THEN     t_delay := T#3S END IF If I modify the variable value to T#2S the IF sets it back to T#3S. Internally the TIME variables are integer. Why would a compare not work as I intend? Many thanks.
  4. It appears that Windows 7 SP1 is required. I've installed that and have progressed into the install.
  5. OS: Windows 7 Ultimate 64-bit running on VMware virtual machine. Installed software: Studio 5000 V21.0 Licence: Concurrent (served by licence server on another PC). On starting Setup.exe from the VM's desktop I get the message     "Studio 5000 does not support this version of windows" Any ideas how to proceed?
  6. How would you solve this problem in ladder?

    Just a hint: Create a counter with a preset of '2' and increment the count with the start button. Q1. How will you control when the output turns on? Q2. What is the simplest way for the stop button to re-initialise everything. Q3. Can you guarantee that STOP will override START? Two lines of ladder should do the trick. Note: it is best practice to wire the STOP button using a normally closed contact arrangement. That way, if a wire falls off or gets cut the circuit will stop.
  7. I'm printing extracts of my code for change control records. The print quality is terrible as it seems to output low-resolution JPEGs to the PDF or XPS files rather than vectored graphics and TrueType (or other vectored) fonts. See the attached close-up showing the artifacts. Exporting in this fashion also makes the resultant PDF unsearchable. I can't find any configuration options for this. Is there a fix?
  8. 4-20mA applied to 500 ohm resistor.

    That sounds fine other than 4 mA into 500 Ω will give you 2 V and not 1 V.
  9. That was the prompt I was looking for. Wago have a library component at OSCAT (Open Source Community for Automation Technology) may have addressed the daylight savings offset in this:
  10. In my application the LMC automation controller will be calculating date-based lot codes. I would like to synchronise the internal clock with a time server such as I can't find any info in the Schneider-Electric SoMachine help files or on the web. Does anyone know if this is possible?
  11. Can FX2N expansion modules be used with FX5U?

    Thanks for the follow-up. We used the correct FX3 modules in the end.
  12. There is, thank you, but it looks OK and is the same as another unmodified panel (as far as I can tell). Build runs OK.    
  13. I'm editing a dual language project for an NA5 HMI. It's working fine except for the message at startup. To modify the project I've had to update the firmware on the HMI. I'm using Sysmac Studio 1.15. Startup language seems to be set correctly. Any ideas?
  14. Thanks, guys. I discovered what my problem was: The first (default) language on the project is not English. I was copying the buttons and editing the English text (with the intention of going back to the resources and editing the default text.) This is effectively the same as editing the second language in the existing string in the resource list. The software appears to work as follows: If you edit the default text it will create a new resource ID and new string. The ID will update to a new number. You can then edit the second language. If (as in my screengrab) you edit the second language then that will edit the resource and affect any items that use that resource. It's quite sensible really!
  15. Thanks, Crossbow. I had found the Resources list OK. The problem is that all three buttons are pointing to the same resource ID. If I edit the text they all change! Even if I create new buttons they pick up existing resource IDs.