If it is a bus pressure transmitter and there is no 475, how can zeroing and full-scale calibration be carried out?
Thread Content
I have never used a bus transmitter before, and I’m not very familiar with the concept of buses; there are probably FF and PROFIBUS, right? During verification, it’s not clear at first how to supply power. Conventional transmitters can read current values; but how is the bus calibrated? Is it only possible to use the data displayed on the screen for comparison? Could there be a discrepancy between the data shown on the screen and the data transmitted?
There are no bus devices in the laboratory; what should be installed?
Well, you’re right; I agree with your view
1. So-called buses are simply communication wires – either 1, 2, 3, or 4 of them. They’re called communication devices; it’s simple to understand. What’s the big deal about a \"bus\" anyway? Idiots create nonsense terms just to show off. :The most common type of bus instrument is one with 4 wires: 2 wires for communication and 2 wires for power supply. 2. Bus instruments are used, of course, to send communication commands in order to operate the instruments. 3. Computers, or other operation terminals, are connected to a set of bus instruments via communication modems. 4. Hart is a type of carrier-based instrument; its networking and communication capabilities are not strong, in fact they’re quite poor, but that’s fine. I guess not many people use Hart instruments for network communication.
5. The biggest advantage of buses is the ability to form networks on a large scale and to enable high-speed data communication.
This post was last edited by 1111111 on 2018-4-30 09:44. 6. Bus communication: What is exchanged between devices are data, such as: reading values, resetting, transferring data, calibrating for zero, checking fullness levels, adjusting sensitivity, verifying linearity, correcting time drift, adjusting hysteresis, and performing data backup........
7. The most popular and widely used industrial bus is RS485 for high-speed communication control; CAN buses, as well as FF and PROFIBUS, are also commonly used. It seems that, just like Hart, these are not open protocols – one has to pay licensing fees to use them. However, the desire for freedom is an inherent human trait, and it is also the nature of instrument development engineers. Since we cannot afford such systems, we can certainly look down on them and develop our own protocols instead – ones that offer greater flexibility, comfort, as well as more advanced and powerful functions. . .
8. Those foreign dogs with bad body odor – I really hate those dogs from the Nazi country. . .
For instruments that use FF, it is best to have a 475 with FF bus authorization. Otherwise, it will be difficult to handle in the lab. For the FF instrument to function properly, at least three external hardware components are required. ①24V DC power supply (for use with the “FF power regulator”) ② FF power regulator ③ H1 master station (LAS); 475 can be used as LAS. However, it is possible to conduct verification on-site even in the absence of the aforementioned hardware. Because since you have an FF instrument, there must be corresponding hardware in the system. Additionally, FF is digital communication, and the display on the header is exactly the same as that shown by DCS. The numbers after the decimal point are all the same. If it’s different, it’s basically a communication issue. (It can be seen on the system)
How is on-site verification carried out? Can the transmitter be powered with a standard pressure signal source, and can the zero and range settings be adjusted by installing appropriate software on the system engineer’s station? Or must adjustments be made only at the field transmitter using 475?
The software works, and the 475 site also works