Steve Bailey

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Posts posted by Steve Bailey

  4. Posted

    I don't completely understand your question. What software are you using to communicate with the PCM module? What command are you entering at the CMD prompt? What are you trying to accomplish?

    Configuration of the PCM module is generally done in the PLC's hardware configuration.

  5. Posted

    Do a search for the variable. Each usage will show up in the results table. You can also cursor to the variable in the variables table and the usages will show up in the "References" tab of the feedback window.

  6. Posted

    I assume you didn't like the suggestions you got when you posted the same question at Phil's site.

    http://www.plctalk.net/qanda/showthread.php?t=105098

    At least you provided a little more information here about what you're trying to accomplish. If you are trying to control the speed of the motor and the motor is connected to a drive, then the PLC's analog output should be wired to the analog speed command terminal on the drive.

    If you are trying to control the armature voltage of a DC motor using a PLC to control triggering of an SCR, a PLC isn't fast enough.

    1 person likes this

  8. Posted

    If you plan to stay with GE, the Rx3i is the current product. You will have to rewrite the program as there is no translator. Be careful about doing a rung-by-rung translation as there are several typical constructions in a Series Six that perform the operations now done in function blocks. For example there are standard rungs of ladder logic to demultiplex analog input signals which will not be needed in the new PLC and similar sets of rungs for analog outputs.

    Your local GE supplier can give you prices for hardware.

  9. Posted

    #3. This is normal behavior with Versa Pro. When you extract a Logicmaster program from a PLC using Versa Pro, it will stay "Not Equal" until you send the same program to the PLC using Versa Pro.

    #5. If I remember correctly, the Versa Pro help files have something to say about this. To convert between RLL and IL, Versa Pro needs some temporary holding variables. In your specific case, there is something missing in those temporary variables. Look up the specifics of your error in the help file.

  13. Posted

    Does the USB/serial converter show up in Device Manager on the virtual machine? Did you specify the correct COM port in Logicmaster?

    Of more importance, why in the world are you still using Logicmaster? Even though you have been getting away with it for several years, you had to know that sooner or later you would get stymied.

  15. Posted

    The suffix letter denotes the firmware version. You can also get it from the label on the PROM chip on the circuit board. The documents GFK-0702 with various suffix letters are the release notes for the details of the features introduced at each revision level.

    CPU331-CE corresponds to firmware version 8.4 dating to December 2003 as described in GFK-0702AC

    CPU331-L corresponds to one version earlier than 4.40 which came out in February 1994 as described in GFK-0702G. I could not locate any release notes for the CPU331 earlier than that.

    It appears that you will need to upgrade your CPU331-L to achieve compatibility with the Ethernet module.

    gfk0702ac.pdf

    gfk0702g.pdf

  18. Posted

    On the assumption that chilled water is more expensive than electricity, my first approach would be to modulate the speed of the fan in response to the exit air temperature. If the fan is unable to maintain the temperature setpoint at full speed, then modulate the flow of chilled water.

    1 person likes this

  20. Posted

    Don't blame your procurement department for the situation you find yourself in. They are justifiably cautious about spending thousands of dollars on components you can only find from used and surplus parts peddlers or on eBay. In my opinion, the "bad management" was in not directing you to come up with a plan to upgrade your PLC to something current.

  21. Posted

    Even if you were absolutely sure which module was causing the problem, why would you bother trying to repair it? Buy something currently available and supported and replace that fossil.

  22. Posted

    And you also figured that people familiar with Omron, Mitsubishi, Siemens, Automation Direct et al wouldn't be interested? Since you didn't bother phishing there.
    2 people like this

  25. Posted

    As long as work for an OEM or an integrator, travel is going to be part of your job description. If you want to do automation without travel, your best bet will be to seek a job with an end user. The drawback is that most of your work will be maintaining or making minor changes to systems designed by others. You won't have many projects where you start with a clean slate.