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So I finally was able to remove one of the senders. It was made by AGM and is said to be how they got their start. It's called a "Pulse Duration Transmitter" I put it on the bench and found: 1 volt in / 3 seconds out 5 volts in / 12 seconds out So I programmed the PLC to measure the...

A while back I posted a question as to why, in about 1985, the water department chose to convert 4-20mA to PWM. I just found the answer. In another system we have two controllers, about 1/2 mile apart, talking to each other via RS-485. I did not know that their RS-485 ports were not isolated...

Mystery solved! I went to the prison. Wow. Their metal detector wouldn't even let me through with glasses on. We had to leave all our belongings in a locker. Shoes x-rayed. They took us on the complete tour. They have two 1-megawatt backup generators. Dentists, doctors on staff. 1000...

I think I'm closer to the answer. There is a site (a prison) that this system pumps water to. It is this site that controls this relay coil. The contacts of this relay go to what I think is a retriggerable one-shot. If the prison loses power to its telemetry, the one shot times out and...

So far I've not worked on a system with a PLC in it. Yes, the rainfall is only about 17" in Sequim, thanks to the rain shadow. A search for maximum sunlight on the peninsula for my planned solar trackers is what landed me here. -Robert

Hi Jraef, Yes, I am in Sequim, WA. http://solar.nikola.com -Robert

Thanks, but I have found the same relay in a system with only one analog input. Maybe it once had two, I've fould all kinds of add-ons / changes that were never documented. The system that has two 4-20s has two completely different set points, so I think this relay must do something else...

Hi folks, I recently was tasked with replacing some old water system telemetry panels with new SCADA gear. I did so, but there was a mysterious relay in one of the old panels. It cycled on/off every two seconds. Since I was replacing everything, I never found out what this relay did...