Search results

As of today, This thread is over 15 years old, having started in 2005. A warning to those seeking Mr. Younkin's paper: providing an email address to a 15 year old thread is not likely to get a response. A web search reveals that Mr. Younkin died in 2011. You might want to try this link: Link

This forum does not support the piracy of licensed software.

Analog circuit vs discrete circuit damage by surge It might be that most of my SCADA experience has been with analog signals but I've found in the half dozen near-lightning-strike failures that I've been involved with that the analog signal inputs and/or field devices were destroyed, but in...

>It's assumed there is 0 PLC solutions for this particular system I think your assumption is wrong.

Thermometry references will state that paralleled thermocouples will report a value of the average of the number of thermcouples. A problem in practice with paralleling thermocouples is that since both thermcouples are presumably measuring the same location or point, both thermocouples are...

1. drain/shield grounding CSA: . . . the shield drain wire(s) of the pair(s) should be grounded at one end only, and by conventions the shield drain wires should be grounded where the power in the wire originates (so in the Control Panel). Your site: The Drain wire was terminated at both...

Surge or lightning protection is a whole field in itself. The web site explains some basics of direct strike lightning protection and also mentions that 65% of voltage/current surges are locally produced by switching of electrical loads like motors or heating systems...

Near lightning strike

If a cable is carrying low-level analog signals, the shield drain wires should be grounded at only one end. Grounding at one end only prevents any current from flowing between non-equipotential ground points, because ground current flowing in the drain wire or shield can couple into the...

You don't climb the 15m silo to read the level in tons from the LR250 display readout, do you? Don't you want the level readout in tons down at grade level where human beings walk and talk? The LR560 is a loop powered 4-20ma HART level transmitter. The display on the LR560 can be...

ratio control: https://automationforum.co/what-is-ratio-control/ Split Range control: https://instrumentationtools.com/split-range-control-loop/

The analog input circuit always 'tests' the input for an open circuit, because thermocouples typically fail "open". But the presence of any Type thermocouple will pass the burn-out test. Most modern analog inputs can be configured for any of a number of different types of thermocouples...

Converting to different engineering units is usually the role of the receiver device, a panel meter/HMI/PLC/DCS. I presume that this level device has an output, like a 4-20mA output representing the level in percent. Feed that 4-20mA signal into a panel meter (or your programmable receiver)...

This 15 year old thread has a part number for the last version of Win Loader. I would not hold my breath anticipating a response from Honeywell though. http://www.plctalk.net/qanda/showthread.php?t=18783 Maybe someone here has an old copy and will show up with it.

I am unaware of a means of ’exporting’ either an individual or multiple DTMs from Pactware. I held off making this reply for a couple days, hoping someone who had uncovered some means of exporting DTM files would comment. But the instrument manufacturers all post the DTMs for their devices on...

I doubt it. In 15 years of hanging around this forum no one has ever mentioned any such compilation. It’s hard enough to obtain communications specs for any given device or even worse, determining how to determine whether any specific device has Modbus, given that Modbus is frequently an...

The HMI’s serial Comm settings have been configured to match the drive? Try swapping the Rs-485 driver lines on one end. Some vendors label the (+) and (-) lines the opposite of other vendors.

I forgot one reason for RTD's to read low - the pollution of the MgO insulation inside the RTD sheath with moisture, i.e. water. MgO is the white powder that electrically insulates the RTD element from the sheath. Electrical insulation is necessary because the excitation current should not be...

Classic ground loop symptoms.

If it were me, I’d test the bad boy AI with a battery powered simulator/calibrator, which being battery powered is floating with respect to all grounds, in order to make sure the AI is functional with a non-grounded signal source. If the AI is good. then I’d fix the ground loop issue with an...