Read Tianze’s self-media article—Common Faults and Solutions for Zhejiang University Zhongkong DCS
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While searching for articles today, I came across one by chance; it’s likely a Self-media post written by Tianze, a long-time member of Haichuan. I’d like to share it with everyone here: @WangTianze @ZhiZheMing @leo_0088 @ylb913 ----------------
In the control station section, the fault light on the main control card is flashing. When there are failures in aspects such as system configuration and communication, the main control card will perform self-diagnosis of these faults, and use different flashing patterns of the fault lights to indicate various types of faults. All the fault lights for the components in a certain chassis are flashing. This situation occurs when the address of the data forwarding card is incorrect, the data forwarding card is faulty, the configuration information of the data forwarding card is wrong, there is a communication issue with the SBUS cables in the chassis, or there is a low-voltage problem with the power supply that powers the chassis; it is accompanied by failure to refresh the data in the entire chassis or by the data values becoming zero. The method for identifying the fault point is to use the \"replacement method\": first, replace a data forwarding card and get it to operate, then observe whether the system returns to normal (be careful not to set the address of the data forwarding card incorrectly during replacement). If the system still does not function properly, it is necessary to contact the supplier. The fault light of a certain card is flashing, or all the data on that card are zero. Possible reasons include incorrect configuration information, the card being in standby mode with the redundant terminal connection not made, a fault with the card itself, or no configuration information available for that slot. When other possibilities have been ruled out and a fault in the card itself is suspected, the “replacement method” can be used. The data for a certain channel is abnormal. In such cases, maintenance engineers need to accurately determine whether the fault lies on the system side or at the site. A simple solution is to disconnect the signal line, and use measuring tools such as a multimeter to check whether the signal on the field side is normal, or to send a standard signal to the system and see if the display on the monitor is proper. If it is initially determined that the fault lies on the system side, then the location of the fault is identified in sequence, starting from the channels, cards, chassis, and control station, in ascending order of scale. For various types of control station cards, there are many different reasons why data from a certain channel may fail or become distorted. For current input, it is necessary to determine whether the card is functioning properly, whether the configuration is correct, what the settings for power distribution are, and whether the polarity of the signal lines is correct. Maintenance personnel need to correctly identify the location of the fault and then take appropriate action.
In the operator station section, there is a host failure. The operator station is an industrial PC, and its basic structure is not fundamentally different from that of an ordinary desktop computer. When a PC malfunctions, the first step is to use the plug-and-play method, replacement method, and comparison method to determine which component in the PC is faulty, and then replace the faulty component or the slot accordingly (replacing PC components should generally be carried out under the guidance of engineering technicians on-site). To avoid replacing components blindly, the location of the fault can be determined based on the number of alarm sounds when the PC starts up.
Monitor failure: When the monitor does not display properly and it has been ruled out that the industrial computer is at fault, check the button settings of the monitor. Determine the position of the “D-SUB/BNC” button on the front of the monitor: if the signal connections at the back of the monitor are made using a 15-pin D-type cable, this button is located in the “D-SUB” position ； If the signal cable connection at the back of the monitor is via a BNC interface cable, this button should be set to the “BNC” position. If the signal cable at the back of the monitor is connected via a BNC interface cable, determine the position of the sync signal switch “Sync.Switch”: if the green sync signal (3BNC) mode is used, this switch should be set to the “S.O.G.” position ； If using the H and V separate synchronous signal (5BNC) or H+V combined synchronous signal (4BNC) mode, this switch is set to the “H/V” position. If the monitor’s colors are not pure, press the “De-magnetize” button on the front of the monitor to eliminate electromagnetic interference. If the monitor’s buttons are set correctly but the display still doesn’t work properly, you can temporarily replace it with a spare monitor or an office monitor, and then contact the supplier to have the monitor repaired. leit/Text
Well, let’s show it to the guys in the control room. There are always some small problems.
Well, let’s show it to the guys in the control room. There are always some small problems.
Tianze was very active on the forum 4 years ago; it seems he’s busy now
Tianze was very active on the forum 4 years ago; it seems he’s busy now
Great stuff. It can be stolen, modified, and then sent again.