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  • Users: xJAyx
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  1. xJAyx

    Pressure control with parallel pumps

    I have a client that wishes to run a pressure control loop using two identical pumps in parallel. The pumps will run on VFDs and the system will not have automatic isolation valves for the pumps. The pumps will feed a cooling loop to several pieces of equipment that will be switched on and off...
  2. xJAyx

    Running and older two speed motor with a VFD

    I am looking for some advice on an application I am working on. I am a controls engineer, but I do not know much about application and selection of VFDs and line/load reactors. I have a system I am working on upgrading. There is a 75hp blower motor that is a two speed two winding style. With the...
  3. xJAyx

    Transistor output leakage

    I have an application where a transistor output on a GE PLC is used to trigger a solid state interposing relay. The could voltage on my relay is 120VAC, and the PLC card is rated for 120 as well. It seems as though the leakage through the transistor is enough to energize my interposing relay. I...
  4. xJAyx

    Siemens S7-300 Backup

    Using Step-7, is there an easy way to connect to a Siemsns S7-300 and create a backup of all blocks and data? Essentially I would like to take an as-found backup of an existing installation. Thanks in advance, Jay
  5. xJAyx

    Missing Modbus Function Codes

    I am integrating a proprietary controller into a system that uses Modbus TCP. I have discovered that this controller does not have Modbus function code 4 implemented, and therefore I can only use it to read holding registers. Anything stored in an input register is inaccessible. My slave device...
  6. xJAyx

    When do new codes take effect?

    The main NFPA code which I work with was revised for 2011, and there were a few major changes. I obviously have no problem complying with these changes, but I wonder when the code officially takes effect. In Canada, our national electrical code gets revised every 4 years, however it doesn't get...
  7. xJAyx

    Allen Bradley SLC5/04 as a Modbus Slave

    Has anyone sucessfully integrated an Allen Bradley SLC5/04 as a modbus slave using the com ports on the processor? I am doing a retrofit on a system and there isn't any space left in the chassis. I want to avoid adding an expansion chassis and going with the Prosoft module if I can. Thanks in...
  8. xJAyx

    Step7 symbol or address search?

    I'm programming in Step 7, for the first time in a couple years. I'm pretty rusty, but it's nothing revolutionary. I'm editing an existing program that a colleague wrote. I can't remember how to search for a symbol or address throughout my FB blocks. Can anyone help me out with this? Thanks...
  9. xJAyx

    Magazines

    What resources does everyone read to keep up with industry developments etc.? Now that Control Engineering and all of their other magazines, (Design news, plant engineering etc.) are gone, I would like to see what else is out there.
  10. xJAyx

    ver small vessel level sensor

    I'm looking for a non contact level sensor for use in a container that has a range of 0.5-6 inches from the sensor. The material is a clear liquid and has chemical compatibility issues, but even without considering that I haven't found anything acceptable. I have looked at a couple ultrasonics...
  11. xJAyx

    API RP500

    I am not in the petroleum industry, but I do work with a fair amount of hardware in classified hazardous locations. I am working with an enclosure that requires ventilation but I do not have a standard for the flow rates and opening dimensions which would be sufficient. I have been told in...
  12. xJAyx

    What counts as 'equivalent to natural ventilation'?

    I am designing an enclosure for some process instrumentation using Hydrogen as one of my process gases. NFA497 rule 5.4.1 states that I can be considered an unclassified area if my gases are contained within a suitable well maintained piping system in an area with adequate vetilation. NFPA 497...
  13. xJAyx

    Fieldbus discussion

    If you are interested in a general discussion about the various industrial communication protocols please see the thread in the control systems forum.
  14. xJAyx

    Fieldbus selection

    Hello Everyone, This are a bit slow in this forum lately so I thouight I would start a discussion about network selection, a subject I have often thought about but never really got to the bottom of. I have worked with a wide range of protocols over a wide range of hardware, but no protocol...
  15. xJAyx

    PAT download

    Does anybody know where to find a copy of the PAT protocol analysis tool for sniffing serial networks? I think mine got lost a few PCs back.
  16. xJAyx

    Step 7 forcing/modifying values

    I am having some trouble with Step 7. I have a program that I have written and I am trying to go through some preliminary testing. I can't seem to force any memory values. I can force physical I/O points, but not internal memory bits. Earlier today I could but now it is not working. Can someone...
  17. xJAyx

    IEC 61131-3 & Multi platform portability

    The company I work for provides furnaces and control products for the heat treating industry. Because we provide products worldwide and for many different clients we have to work with a bunch of different PLC platforms. This is a new situation for me, before this job I have never programmed the...
  18. xJAyx

    Sequential automation with a siemens S7-300

    I'm programming a pretty simple sequential automation system using a Siemens S7-300 series PLC. I've programmed a bunch of PLCs in the past but never a siemens and I've never used sequential automation before. I'm not too worried about the whole thing, but I wanted to just check in to see if...
  19. xJAyx

    STL platform translation

    I just started working for a new company and they want me to look into converting some of their standard function blocks from Siemens Step7 to a WAGO I/O platform. Their systems are not overly complicated and the WAGO has more than enough processing power to handle the job. Everything they want...
  20. xJAyx

    Sequential automation with a Siemens S7-300

    I'm programming a pretty simple sequential automation system using a Siemens S7-300 series PLC. I've programmed a bunch of PLCs in the past but never a siemens and I've never used sequential automation before. I'm not too worried about the whole thing, but I wanted to just check in to see if...

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