Communication issues with Zhejiang Zhongkong
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Recently, I encountered a problem: a UPS failure resulted in the loss of power to one circuit; switch A lost power, while the indicator lights on switch B were normal. However, all the data on the DCS operation station showed question marks, and communication was interrupted. The power to switch A was restored, and the data at the control station became normal again. Then I unplugged the network cable coming from switch A, and the data flow remained normal, which was strange – why was there no data when switch B was operating on its own? ?
Try it again when production stops. If that doesn’t work, you can call Zhejiang University’s central control service hotline for assistance.
First, it is necessary to clarify which system it is: jx300 or ECS700? It is necessary to thoroughly uncover the truth behind this matter; otherwise, it will pose a serious risk when driving in the future as well. Suggested search directions: 1. Power supply. Normal switch indicator lights do not necessarily mean that the network functions are working properly. 2. Check whether the network cables connected to the switch are plugged in incorrectly. That is, some B-network cables are plugged into switch A. Hope this helps!
Are you sure you’ve understood the A and B on the controller as well as the AB on the switch? It’s really strange; I guess only by being on site can one know the exact situation
Ping the address of the main control card from the operation station to check; ping all the main control cards that serve as redundancy. Check the power supply again – ensure that the redundant 24V DC power supplies are powered by two separate 220VAC sources.
First, regarding the system model: it’s useless to unplug the network cable, as the two switches can still communicate as long as they have power supply; it’s better to try unplugging the power supply of switch A