FF fieldbus
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consult: How many meters can be connected to one loop of the FF bus? What if a safety barrier is added? ?
One SEGMENT of the FF bus can host 16 meters, but in production practice, only 6-8 meters can be connected. Among them, the number of meters that can be connected to 1-2 valves does not seem to have much to do with the safety barrier.
Thanks! However, it is said that the safety barrier seems to have a power supply problem. Is it not possible to add a relay on the FF line? ?
Adding a relay serves to isolate the signal. It can be added to the DCS system, but why can't it be added to the bus? In some systems, the channels or cards are isolated, so there may be no need to add relays. It is also ambiguous about the FF bus. There are experts on the system in Haichuan. Please give me some advice.
http://www.best-gk.com/bbs/viewthread.php?tid=693&extra=page%3D1
Please ask the experts: Can the 4~20 mA signal of AI be connected to the FF bus? Do I need to add another conversion module or provide an external 24VDC power supply?