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  1. typhonic

    PID Symbol for Emergency Stops

    Perhaps this should be a separate thread, but your question got me thinking - we receive P&IDs with E-Stop shown as a function inside the DCS, that is, a pick on the screen that should stop a process immediately. I know I prefer to have only hardwired switches using the name "E-stop," but I...
  2. typhonic

    Yokogawa Processor Loading

    Does anyone know how to estimate processor loading in a Yokogawa CS3000 DCS? For example: if I configure 50 PID blocks, what percent of the processor's time does this consume. I know it depends on the particular processor model, but any you have knowledge of would be helpful.
  3. typhonic

    Taking Notes during Phone Calls

    "The work related emails you send/receive when at work are company property!!! They should not be deleted when you leave & probably not even copied & removed from the premises." CorBlimeyLimey, that is not universally true, only if there is an agreement in place beforehand. I am a business...
  4. typhonic

    Taking Notes during Phone Calls

    At my first job at an engineering company I was talking on the phone one day with the client. He asked me to pass a message to the Electrical Engineer, a man with plenty of experience. When I delivered the message, the EE said I was mistaken because the information contradicted the established...
  5. typhonic

    Should I take this job?

    EngJW is right. To that I add the old axiom: It is better to look for a job while you have one. A potential employer will value a prospect who is employed over one who is unemployed (other attributes of the prospects, notwithstanding). Additionally, the fire protection designer job seems...
  6. typhonic

    FlexEX I/O Fault Monitoring and Reset

    We are using Allen-Bradley FlexEX Remote I/O over ControlNet. The Discrete Output Modules are model 1797-OB4D/A. The CPU is a 1756-L55 Rev 13.25 and the programming software is RSLogix V13.03.00. The trouble we are having is that when we enable I/O Fault Monitoring on the module, the output...
  7. typhonic

    OPC Server for rs-232 serial communication (HMI app)

    Years ago I used Software Wedge by TalTech to help develop a communicatioins driver. It has tools to capture and interpret serial RS-232 data. Once the driver was written, I did not need the Software Wedge product any more. That software communicates via DDE, not OPC. I am really surprised...
  8. typhonic

    Differential Pressure Calibration Problem

    Thanks. At your suggestion, I checked the specifications and found information about the drift at different pressures. During our next calibration, we plan to connect a spare transmitter next to the working transmitter and make a spot check at the current operating conditions. This may be a...
  9. typhonic

    Differential Pressure Calibration Problem

    We use an orifice plate for natural gas flow measurement. We calibrate the Differential Pressure Transmitter (DPT) by placing a reference pressure on the high side and venting the low side. So for example, we may have 100 inches of water column gauge pressure on the high side and atmospheric...
  10. typhonic

    beginner SCADA

    I hope you, thryll and datniet, will post updates as your projects progress. I have been through similar projects and I have confidence in you. Let us know what successes you have and what obstacles you encounter.
  11. typhonic

    beginner SCADA

    I suggest you try Infilink which you can download and try for free from their website: www.kep.com. If all your controllers use the same communications protocol, then you will only need one communications driver (OPC driver) which you also download and try for free. You may need to install 9...
  12. typhonic

    Visual Basic to PLC connection

    To use VB you will either write your own communications driver for Siemens S7-400, or buy a license to use a commercial driver. Some drivers are easy to write, but I have no experience with Siemens S7-400 communications. One possible supplier of a pre-written driver is www.kepware.com.
  13. typhonic

    Convert doc to pdf using VBA

    OpenOffice Ver 1.1 will read and write MS Office documents and will export PDF as well. It is a free download from www.openoffice.org. ...John
  14. typhonic

    Remote Procedure Call

    Is it possible to make a remote procedure call from VB inside MS Excel to another computer on the same network. I want the remote computer to make a copy of a file on its own hard drive and I want to initiate the action from a VBA macro on my computer. I can make copies with a local copy...
  15. typhonic

    Parallel Deaerator Control

    Thanks for the help folks.
  16. typhonic

    Parallel Deaerator Control

    We plan to install two Deaerators in a steam plant each sized for 60% of full load. Plant normal load is 25 - 50% of full load. What is the best way to control steam and water into the Deaerators? Currently, we plan to 1) pump water from condensate return through one valve controlled by...
  17. typhonic

    Data aquisition

    Advantech (www.advantech.com) has several solutions starting with the ADAM-4016 strain gauge module. ...John

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