Search results

You appear to be mixing up current [loop] protection with storm created voltage protection, including high static voltages, which is a very different scenario. We have in the past used barriers, not only for isolation but knowing they would protect from high voltage spikes. A DC to DC...

Please explain how the instrument and it's 24vDC power supply is protected from lightning surge with just an isolator ?

The above would work for A=B only. How would you surmise A>B and A<B ?

This must be a fairly recent innovation by Siemens as I have not heard of master / slave relationship between CPU's and I/O modules. Historically and especially the S5 series processors, I/O was fixed addressing in 'bytes' so one 16way i/p module would take up 2 addresses. This has continued...

This appears to be test for those of us who can count in binary but can implement an example logically; and maybe start off from a blank sheet of paper which is how we used to commence software in the 1980's. Firstly create 4 ladder rungs, each with 2 contacts from I0 and I1. Each o/p is the...

As stated above, the surge protector above is intended to protect at 670vDC. A surge would have already destroyed 24volt device by then. The nearest I can find is by Furse for telephone applications - see if the spec. is suitable for your application: IP66 Telephone Line Protector - Furse ESP...

https://control.com/forums/threads/inlet-bleed-heat-system.24715/

The early 984's used to have the hardware and comms. configuration as part of the application program; how to access would be integral to your software. What software are you using ?

It was many years ago Rockwell went with PC based control. All seemed fine but every so often the PC crashed for no obvious reason. Can't remember now what it was called. So have stuck with PLC's - and the Micro800 is an excellent small, good value for money PLC.

If the fault cures for a while then it suggests your application is OK. It's not clear why the PSU would be the cause; more likely intermittent corrupt memory. You can still buy secondhand / new P120; the disadvantage of external psu is multiple output voltages.

I've just glanced at a 20yr old manual from APOGEE and I'm not surprised Siemens dropped PPCL - even in 2000 it appears to me very dated and thus limited in evolutionary terms. I'm guessing if it has US (united states) processor then firmware would have originated there as well. In which case...

Generally it's the vibration monitoring system that suppresses unwanted alarms at startup; however your description suggests unwanted vibrations occur on speed increase. You also have a variable speed pump, so how / at what speed would you determine when vibration monitoring is to be suppressed...

It was a few years ago but I had a project with a Siemens S5 (it was a few years ago !) using Emerson drives. The only digital signal was a 'stop' signal for safety reasons. All the commands, including stop, were sent by ASCII messages to each drive {four in total}. Made the Software an...

Welcome to the Forum. I'm tempted to say the PLC is the easy bit although as a beginner, Siemens PLC's take a little time to understand. You haven't stated make/model of motor drive, so I'll make a few assumptions: For raising, you want the PLC to give a digital o/p (output) to 'Go!' {upwards}...

There is nothing in the VFD manual that suggests the analogue i/p or more important the common can be connected together. Like wise for the PLC A/O common. One suspects if you asked the manuafacturer's distributor you wouldn't get a straight answer either. Clearly the VFD is designed RS485...

There must be numerous types out there; the first appears most complex where the buzzer circuit is separate from the detection circuitry: https://www.electronicshub.org/rain-alarm-project/ http://techlib.com/electronics/raindetectors.htm...

That's generally the idea ..... However, the origin of automation as a rule comes from either client or consultant, or even a process engineer for a specific process. There is also working for a panel builder / system builder as we used to call them. So instead of having a MCC {motor control...

DB9 '9 pin D connector' for RS485 should have pins 3 and 7 connected...

OK It's a while since I have come across inductive and capacitive measuring devices: https://www.micro-epsilon.com/displacement-position-sensors/?sLang=en

You are spoilt for choice - ultrasonic, optic, radio / radar, although the last two are probably better at longer distances. Also depends on what you mean by non-evasive, any of the above could be invasive. it is assumed physical attachment is invasive.