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Changes for page 08 Troubleshooting

Last modified by Mora Zhou on 2023/12/22 11:04
From version 8.1
edited by Mora Zhou
on 2023/12/22 11:04
Change comment: There is no comment for this version
To version 6.1
edited by Leo Wei
on 2022/06/11 14:55
Change comment: There is no comment for this version

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1 -PLC Editor.WebHome
1 +PLC Editor.1 User Manual.WebHome
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1 -XWiki.Mora
1 +XWiki.admin
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1 1  The most common faults of PLC can be classified into three main categories: **1. Power failure; 2. I/O failure; 3. Communication failure. **Wecon PLC consists of three boards：upper board(communication board), middle board(CORE board) and lower board(power board), so users can judge which board has the problem according to the fault.
2 2  
3 -= **Power failure** =
3 += **1. Power failure** =
4 4  
5 5  The power board supplies power to the above CORE board and light board. When there is a problem with the power board, some signals transmitted to the above board will have problems. Common PLC power failures are as follows:
6 6  
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16 16  |=3|RUN light is off|1. Use a multimeter to measure whether the 24V voltage and 5V voltage on the BD interface are normal when the PLC is powered on;
17 17  2. There may be a problem with the CORE board of the host, and confirm the replacement.|If the voltage of the power board is no problem, user need to replace the CORE board to confirm whether there is a problem with the CORE board.
18 18  
19 -= **I/O failure** =
19 += **2. I/O failure** =
20 20  
21 21  The input and output of PLC is the main function of use, and I/O point problems are often caused by improper use or process\individual device problems; Including how the customer uses it, whether the mount is in compliance, etc. are all causes that lead to I/O failures .
22 22  
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30 30  |=2|Y point failure|1. All COMx of PLC are connected to COM;
31 31  2. Power on the PLC, use the buzzer of the multimeter, pen one test lead on COM, and the other on the Y that needs to be detected, and observe whether the buzzer sounds when the lamp board Y is not lit. ;|The normal situation is that the buzzer will beep when Y is turned on, and there will be no buzzer when it is turned off, or the Y point needs to be replaced.
32 32  
33 -= **Communication failure** =
33 += **3. Communication failure** =
34 34  
35 35  The main communication ports of PLC are two serial ports, one S terminal serial port, and one USB port. The specific troubleshooting methods for communication faults are as follows：
36 36  
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55 55  2. Control variables to determine whether it is a module problem or a host problem;
56 56  3. If the communication is abnormal due to the host, replace the upper board and the CORE board respectively to confirm;
57 57  4. If it is the module that causes the communication abnormality, it needs to be analyzed and checked separately;
58 -|=6|RUN and ERR flash in same frequency|1. Unstable power supply
59 -2. Firmware issue|1. Measure the power input and ensure that the power supply is stable.
60 -2. Replace the core board(middle board) and check.