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  1. plcsavvy

    Looking for Protective Cover for HMI

    Seems that all you need is a hinged cover. Hoffman corporation makes an aluminum HMI enclosure that has two hinged covers. The rear cover provides rear access to an HMI and the lockable front hinged cover with clear plastic, provides access to the screen. This device will completely encompass...
  2. plcsavvy

    Looking for Protective Cover for HMI

    I contacted 3M corporation on your behalf since they are a customer. If the touch screen in question is of the capacitive type, you are in luck. If the touch screen is resistive you are out of luck. best regards, PLCSAVVY
  3. plcsavvy

    Looking for Protective Cover for HMI

    You may be able to use a protective film available from the 3M company. This would permit the operators to continue using the touch screen and forego the cost of a hinged plastic cover and additional pushbutton interface. best regards, PLCSAVVY
  4. plcsavvy

    AS-interface pros and cons

    Thanks for your input sed2developer. The machines that I am involved with are large converting lines having approximately 3,000-6000 I/O points. These could be used on several pushbuton stations along the line. Several sections of our machines employ slip rings which are very expensive. This is...
  5. plcsavvy

    AS-interface pros and cons

    Do any of you have experience using the AS-interface from Siemens? I have recently begun investigating the possibility of employing this system to replace conventional pushbutton switches, pilot lights, sensors and associated parallel path wiring. I Would like to konow the pros and cons as well...
  6. plcsavvy

    URGENT need help with PLC5 and wonderware comms

    I am using an Allen-Bradley PLC5 connected to wonderware via RSLINX. I am using DDE data exchange. Each time I try to run wonderware intouch v7.0 viewer, I receive a message under rslinx DDE comms event log. The message is as follows; "affected item list 1035 type read invalid file type". I am...
  7. plcsavvy

    translating a process sequence into a timeway

    It sounds as though you want to complete a repetitive sequence of movements. Is This true. It is not clear from your post what exactly you are trying to do. Can you be more specific please? best regards, PLCSAVVY
  8. plcsavvy

    GE FANUC PLC

    Versa Pro is a very good windows based programming interface for the GE 90/30 and 90/70 family of PLCs. Logic master is old and antiquated. best regards, PLCSAVVY
  9. plcsavvy

    Ethernet for Industrial I/O

    You can send the data directly to Excel, using rslinx as the server. search the help files in RSlinx. I set up this interface in about 2 minutes. It was very easy to do. search for DDE TOPICS and automating Excel etc.. best regards, PLCSAVVY
  10. plcsavvy

    PIC & Reliability

    The pic brand of microcontroller is just fine for industrial use. I would also recommend an SX28 or 52 ac/dp from ubicom (formerly scenix semiconductor) Parallax offers a BASIC interpreter which can allow for both assembly and Basic instructions. The chip is extremely fast as it can execute 50...
  11. plcsavvy

    Pressure Sense- Shut Down

    If the speed of the fan is proprtional to the inches of water colum, you can use a tachogenerator. A DC tachogenerator can output a 0-10VDC signal. this signal can then be compared to a setpoint value to activate an analog in to relay output device to disconnect power. below are links to a...
  12. plcsavvy

    PLC Number Interface?

    I think I would try to determine why the count value is getting lost when a manual operation is performed. Look for code that either resets the counter or places a value in the register that the counter is using. I would start by performing a search on the counter register. Some PLCs can use as...
  13. plcsavvy

    Need input on SLC500 Prog

    Yeah I can think of even more elaborate ways to do it too djs. However, I prefer to explain things in simple terms for the beginner.
  14. plcsavvy

    category 3 safety circuits for ac drives

    I learned from a Siemens rep today, that profibus-DP is safe to category 4 for communications only. It can therefore, be used to provide the run signal to the drive. So the two contactors I have provided to remove power from the motor are sufficient. best regards, PLCSAVVY
  15. plcsavvy

    Automating a Key Strike

    You could also use a servo driven linear actuator (electric cylinder). The cylinder is powered by 24vdc and can of course be controlled by a PLC. A reliable and easy to program electric cylinder is one from mirai international. This cylinder does not even need a PLC for control. It can be...
  16. plcsavvy

    Automating a Key Strike

    I would use a small servo motor from an rc car, aircraft, etc. I would then use a parrallax basic stamp to conrol the servo motor. best regards, PLCSAVVY
  17. plcsavvy

    Need input on SLC500 Prog

    Oops I made a mistake. Timer 2 turns on when timer 1 done bit is on. Sorry for the confusion. Use the normally closed timer 1 done bit to turn on the output to the solenoid. best regards, PLCSAVVY
  18. plcsavvy

    Need input on SLC500 Prog

    first off we need to know the hardware. Is the cylinder single acting or double acting. i f single acting (spring return) you will need a single solenoid valve with sping return. I f using a double acting cylinder you will need a dual solenoid valve. If you are using a single acting cylinder you...
  19. plcsavvy

    Which PLC

    If you go with automation direct, make sure that the digital outputs suppply enough current for your application. For example a koyo 205 plc I recently used could not source enough current to power a stacklight! I then opted to use a solid state relay between the output and stack light. best...
  20. plcsavvy

    Panelview

    when you say fade out, do you mean that the screen is visually dimming. [Perhaps you need to change the backlight. If you mean that communications are not fast enough. (Assuming you are using data highway) you can upgrade your panelview to an ethernet unit and communicate over ethernet which is...

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