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If you have Rockwell support- go to this page: https://rockwellautomation.custhelp.com/app/answers/detail/a_id/468494 I had the same issue with RSLogix 5.

Can anyone direct me to a table or calculation regarding flow of water, impelled only by gravity, through a pipe or channel? I would like to determine the nominal flow rate of water flowing through a 1" (I.D.) pipe, with no other pressure than just gravity. The vertical drop from the tank is...

For wire numbering it is hard to beat a hot-stamped or thermal transfer tube. They can stand up to a lot of punishment and be readable for years.

Yeah, I just used a transistor as a place-holder. I have never seen this form-factor before. Ia this a common older style for Diac/Triac/Thyristors?

I have an old hand tool that utilizes a universal motor that has failed, and there is a three-terminal device on the board in the tool that I have never seen before. It is where the problem likely lies (there is smoke residue around the device) There are no markings, orientation dots or any...

I did find this interesting paper: http://literature.rockwellautomation.com/idc/groups/literature/documents/wp/1761-wp003_-en-e.pdf

I have seen, in years past, a really good explanation as to how linx hijacks the port and the additional protocol layer that it uses (beyond TIA-232) but I have not been able to locate it. I was just looking for a little insight into the nuts and bolts of the linx DF-1 driver

Can anyone explain the details of what rslinx does with com1 when the driver is running?

Yes that was a good response- I am sure that H2S explains the problem- however it leads to other questions- Why is it white corrosion on copper terminals and why only the negative terminals?

One additional thing- all copper turns black in the panels very quickly. There is some new wiring that was added late this summer that are already black.

Nope, nothing but a very foul odor. (it's a waste water treatment plant). That being said- I guess there is a possibility of fumes from the process entering the room, but this is the only thing that appears to be affected.

Thanks for the response- but to clarify- there are no batteries in this room or in this system.

Hi, I thought this might be the best place to begin my quest. We have an electrical room in a waste-water facility that stays relatively clean and dry- yet quite often (monthly) there is a growth of a white, almost calcium looking, substance that covers all the terminals that are common with the...

I agree, it is a strange design to say the least (196 volt DC Valve?!). During operation the temperature on the hotter valve (the one that doesn't fail) is 60 degrees C. The valve itself has been changed (probably a few times) since this started. Even though this may be an unusual design, it was...

For further clarification- There are two machines both doing identical work on the line. Both machines are identical. This is a relatively new problem and several people from all shifts have looked into this problem. The design, from the manufacturer, is a 196 Vdc coil on a Bucher hydraulic...

We have two identical hydraulic systems on a production line. One hydraulic valve coil fails daily (or even more often). The systems are the same electrically. My question is can excessive stiction in the valve or unusual forces in the mechanical system create this problem?

You could easily alias your tag (in the PLC) temporarily to a counter or timer accumulated value to see the graphics respond. To test the system (PLC, HMI), why not hook up a signal generator (4-20mA, 0-10V or what ever the real world signal is going to be) to the input of the PLC and watch the...

I have seen problems in the Square D masterpact similar to this before. If the trip unit fails then the breaker defaults back to a low percentage of its frame rating. This is an easy fix and the trip unit is only a couple of hundred dollars. This may be your problem.

Try this site- it will likely work on the micro as well.... http://freespace.virgin.net/ian.sullivan/rockwell.pdf

Thanks all for your valuable input. We performed a test last night to determine losses due to evaporation- The measurements indicate approximately 60 gallons per hour are being evaporated. At this point I’m still trying to reconcile this mathematically.