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  1. dieselvette

    Assembly made of CE-certified components

    Hey all, If I build a simple product in which all electrical components (not electronics - just switches and fans) are CE certified from the manufacturer, and it is assembled in such a way so as to conform to all manufacturer instructions/specifications for each component, then is there any need...
  2. dieselvette

    Sensing temp without transmitter to PLC input?

    JLSeagull: The trouble is that a Pt-100 (thermocouple/RTD ready) analog module isn't any cheaper than a transmitter (as a general rule), and is capable of ONLY temperature inputs. Main advantage at that point would be asthetics & easier setup. I agree that if I were in need of 2 or more...
  3. dieselvette

    Sensing temp without transmitter to PLC input?

    more specifically: accuracy of 2% per 100 degF and precision of 1 degF increments is sufficient. Repeatability & consistency is more important. The sensor will never be calibrated or tested for accuracy (after intitial testing & production) so it needs to stay within the 2% accuracy as long...
  4. dieselvette

    Sensing temp without transmitter to PLC input?

    Anyone know of a temperature probe with mA or V output, that doesn't require an $80 transmitter? The purpose here is to read a temperature 60-150 degF and send it to an analog PLC input. Must be a way to do this without spending big bucks. After all, I have a temp sensor in my house with...
  5. dieselvette

    Busduct Monitoring - how?

    When I did P.M. for a large machine shop, we checked periodically for overloading with an hand-held infrared heat sensor. Obviously, if the bus bar got over a certain temp, there must be a problem. If you don't need anything too precise and you don't need the constant data availability, then...
  6. dieselvette

    Need to make control circuit diagrams for troubleshooting

    yeah - sounds like a great program, but how much do we want to spend is a great question. Sounds expensive, but is pretty much exactly what I'm looking for. I'll have to look into it. Thanks for the info, nic Nic Van Engen Electrical Technician
  7. dieselvette

    Using 5VDC sensor as analog input

    I would like to use a relative humidity sensor which operates on 5 Volts DC, and has a linear voltage output of 0.75v to 3.75v based on %RH. 1. What's the best/least expensive way to supply the sensor with 5 VDC? 2. Can the PLC interpret the input voltage if the sensor is powered from a...
  8. dieselvette

    S7 400H startup

    Last time I used an S7-xxx and needed to save data during power loss, I made a recipe which was stored on the memory card. In my case, every hour the recipe (with updated values) would be written to the memory card. I imposed a one-shot at the beginning of the program so that if it were to...
  9. dieselvette

    SoftPLC vs. True PLC

    (sorry this is a little off-topic) "...One of the major thorns in Dilbert's life is his boss, a "pointy haired boss" (PHB)..." If Dilbert's writer is a local, then you must know who his real PHB is/was. So then I must know, does he really have pointy hair? "...Damn, it's the people...
  10. dieselvette

    Light Switch with contactor

    There are rocker switches available, the kind used for low-voltage lighting control. At one time, larger buildings were often wired with 24V control and then a bunch of contactors at a central location to control all the lighting. A 3 position ON/OFF/ON momentary rocker was often used for each...
  11. dieselvette

    Keeping program STATUS in PIC

    This machine doesn't have any moving parts, and no matter what it does on power-up would not create a dangerous situation. Not to mention, our systems runs unattended - no one even on the site - for weeks at a time. Once again, if it DID have moving parts, one would use a start button and some...
  12. dieselvette

    Keeping program STATUS in PIC

    Let me rephrase: Are there PIC's available with those capabilities? Nic Van Engen Electrical Technician
  13. dieselvette

    Keeping program STATUS in PIC

    eeprom - would work in this scenario, although I wouldn't know how to set it up (writing to the eeprom that is). Has anyone ever tried that? Nic Van Engen Electrical Technician
  14. dieselvette

    Keeping program STATUS in PIC

    The PIC will not be controlling machinery, just heaters and a few other non-moving parts. However, if it was controlling machinery, one would certainly incorporate a START button of some sort which would resume the system where it left off, rather than just starting it upon power-up, in order...
  15. dieselvette

    Keeping program STATUS in PIC

    Does anyone know of a way I can keep the status of my PIC in memory indefinitely in the event of a power loss? For example, as the program is running power is lost for a month. When the system is powered up again, I want the program to pick up right where it was when it lost power. Nic Van...
  16. dieselvette

    Need to make control circuit diagrams for troubleshooting

    (Continued from above) ...This is why I need to draw a pictorial diagram, preferrably using a program which is specifically for electrical diagrams, so that conductors are conductors, switches are switches, and components are components; rather than just a bunch of lines and pixels that look...
  17. dieselvette

    Keeping memory in "smart relay"

    Does anyone know of a way I can keep the status of my "programmable logic relay" (Siemens LOGO in this case) in memory indefinitely in the event of a power loss? For example, as the program is running power is lost for a month. When the system is powered up again, I want the program to pick up...
  18. dieselvette

    Need something simpler/smaller than a micro-plc

    Thanks ADMIRALKEN! That's perfect, they even have a bare-board model (circuit board with no fancy plastic case) 120V for $65 - 6IN 4OUT. or 12IN 8OUT for $79. Nic Van Engen Electrical Technician
  19. dieselvette

    Need to make control circuit diagrams for troubleshooting

    As simple as this machine we're building is, I think a pictorial is sufficient. The technicians we work with, when troubleshooting, are usually not electricians but are just building maintenance personnel. They need pictures. Nic Van Engen Electrical Technician
  20. dieselvette

    Need something simpler/smaller than a micro-plc

    Just for the record, I don't think either Keith or Rich are soliciting, just trying to give some answers. As a matter of fact, I had visited Kieths website before I ever visited this forum. Rich is not after business as he is still prototyping, so to speak, and a guy's gotta start with some...

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