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Thank you for the explanation. It felt like attending an online meeting. It might be more engaging if you add practical demonstrations, illustrative videos, or animations to your content.👍
I live in Mexico and I just discovered my supplier has been under filling our tank for the last 5 years by simply rotating this stupid magnetic gauge to show its full. I just figured it out. What sensor can I install to see how much propane is actually entered. All of the suppliers are controlled by local mafia and our corrupt HOA won’t allow any new suppliers, so please don’t bother recommending a new supplier. I need something my wife can see the level before and after it is filled and pay. I’m not usually home when they arrive.
I've never seen a more concise and coherent explanation of SNMP MIB files. With this information I am finally equipped to handle all of my SNMP related tasks. Thank you Andrew!!
Most SCADA only cater for large applications. They simply cost too much for one off small applications. Even a good HMI often goes for multiples the cost of say a S7-1200 that you control the system with. Basic HMI’s are priced at about the same price as the PLC, but they are limited. So then you end up making a plan….
My professor gave us a link to this video. I'm taking a class called "Introduction to SCADA". I'm learning new things as I'm taking it. Thanks for the video.
I'm unconvinced the R3D approach is all that accurate. The principle upon which it is based is the strength of a single magnetic field without any inherent self calibration possible. Although the companies selling the overpriced apparatus would have you believe otherwise. I'd argue the visual gauge itself will be more accurate accurate, and that's about as good as it gets for a LPG supplier standard issue setup.. Although warnings on the gauge faceplate NOT to use for filling purposes may have you questioning this. I'd expect a refocused $10 usb webcam would give a the most accurate reading and clearly indicate failure scenarios such as the sensor (camera) becoming dislodged during a hasty filling operation.
I am just facinated by the fact he is writing all that backwards... or am I missing something. Thats a mind bender. Oh and the soothing spa music make sthe video so relaxing after fighting snmp trap errors!
do you have any gear that does the reverse of this, ie takes dry contacts as inputs and then sends snmp traps based on what the dry contacts are telling it?
Your content has elaborated how Scada communicated with outstations specifically downstream and upstream perhaps missing major part of DNP3 which is "Unsolicited Response". Generally, where Scada sends poll request to outstation and to that outstation sends requested data but in DNP3 outstation will send data upstream to master without waiting for poll request. Then comes timestamping and gathering multiple time slicing, where outstation can timestamp and gather multiple time slicing of data and post conditions are meet this chunk of data it assembled and sent over master . Finally, Scada disassembles the data.
Good advice. I've worked with quite a bit of snmp in a wide variety of devices and the implementation in some systems is pathetic.. An afterthought in many cases just so the marketing department can include it in the feature list IMO. I worked with one fairly sophisticated security camera control system whos snmp implementation was down right frustrating. They provided no points for polling where you could find out the current status of one of the cameras, but rather it sent a trap to let you know that a camera was offline, but did not send you another trap when it came back on line and there was nothing to poll to find out. I've also had to work with some systems that didn't provide a MIB file, so although it supported snmp, you were in the dark as to what the points where. Hours and hours of time emailing and back and forth with these companies only to have them ignore the need for fixing their problems. What was worse was the promised some would make to fix the problem in the new release and you're waiting. When you get it you find out that they didn't fix the problem at all. My guess of course is that these companies didn't have any or many customers that actually use snmp.
