Will excessive length and twisting of the instrument cable cause problems?
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This post was last edited by Catalyzing a Grain on 2018-5-3 at 17:31. Everyone, I’m facing a problem: the vortex flow meter in use communicates via FF protocol, and occasionally it shows a communication error. The cables connecting the sensor and the transmitter are quite long, so I installed them in a looped configuration; however, the manufacturer said this is not allowed. What do you all think? The alarm will be triggered by circular motion
This cable of yours should not be the problem; communication failures are usually caused by issues with the communication circuit board. Try swapping it with another flow meter to see if that helps. If it’s a problem with the orange cable, I guess it should be reported as a sensor failure.
That manufacturer? Nonsense, complete crap. . . Go and slap his mouth to swell up his crooked mouth. . . Bro, I’ve got your back; I’ll pass you the bricks. The sensor cable gets coiled and bent, and communication fails – it doesn’t matter at all.
When I see such a face with a big forehead, I just want to kick that ugly face. . . :The communication quality is poor, especially when there are many instruments in the network; it’s difficult to identify the cause. If the faults don’t occur frequently, it’s almost impossible to find a solution. Once, I carried out network testing – there were over 10,000 attempts at communication, and only one failure occurred. It took several days to figure out what was going on; after making a few changes to the code and conducting further tests, hundreds of thousands of communication attempts were made without any failures. Poor hardware performance of the instruments, inadequate software design, low-quality cables, poor electrical or magnetic shielding, or even bad luck could all be reasons for failed communications. . . .
. Logically, no matter what one does – including biting one’s tongue while eating or urine dripping onto pants – if the failure rate is below 0.03%, it can’t be considered a failure at all; such things should rather be regarded as examples of high-quality work. . . . . . . :lol. Just get on with the work; as for those unpredictable, unclear incidents, don’t dwell on them – just ignore them and move on.
The length of the cables connecting the sensors and transmitters has no impact on communication (but with so many coils, the choice of connection cables is certainly not appropriate). The communication module for the bus is located inside the transmitter, but the orange bus cable should be as short as possible; therefore, no more than what’s necessary for one coil should be left as a coil – everything else should be cut off. The connections of the bus cable must be handled carefully, as even a tiny burr on the shielding mesh that comes into contact with the signal wires (metal to metal) can cause communication problems.
This is an E+H flow meter that allows the current value to be output in case of a fault; this way, the 4–20mA signal output remains unaffected. If the panel on site reports a fault, let it do so. I have several flow meters here that behave in the same way – they often report faults, but restarting them resolves the issue. The manufacturer tried to fix it several times without success, then came up with various excuses.
To be precise, sometimes communication failures are related to overly long cables; other times they are caused by strong electrical interference. Communication problems are generally difficult to resolve. But please, some people should be more careful with their words; who do they think they are to talk like that? This watch is from E+H. I used to be an engineer at E+H as well, and although I have left the company, I still hold respect for my former employer. I hope everyone will show respect for the engineers who help solve your problems.
To be precise, sometimes communication failures are related to overly long cables; other times they are caused by strong electrical interference. Communication problems are generally difficult to resolve. But please, some people should be more careful with their words; who do they think they are to talk like that? This watch is from E+H. I used to be an engineer at E+H as well, and although I have left the company, I still hold respect for my former employer. I hope everyone will show respect for the engineers who help solve your problems.
What you’re saying is very amateurish; claiming that the length of the cable has nothing to do with communication shows that you don’t even understand communication reduction.