Possible reasons are as follows:
Cause 1. Communication is unstable
Reason 2 There is a problem with the PLC program, for example, your program press the action is conditional when you restart the PLC, the internal registers that are not kept will be reset, so you will move after the restart
Cause 3 The configuration program of the touch screen is faulty, for example, scripts are used May there be a problem with the execution cycle (sometimes the script is correct, but because the action execution time is too fast, there is time for the PLC and the touch screen to communicate, and there is time for the touch screen to write to the PLC, if the action is too fast, there is no scan in the PLC within a scanning cycle, there will be no action).
The reason is that the problem of key signal processing will cause the touch screen induction key to fail.
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There are oil or water stains between the lines, resulting in line leakage, will also cause the touch screen sensor button failure.
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If there is a problem with a diode in the induction cooker, it will also cause the touch screen induction key to fail, and the maintenance of this problem is more complicated.
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If the induction cooker is still under warranty, it is directly sent to the brand's maintenance department for repair, rather than dismantling the official machine.
There are many reasons why the touchpad of the PLC control system does not respond:
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① The dust or scale accumulated on the touch screen is very serious, resulting in the touch screen can not work;
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② The touch screen is faulty;
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③ Touch screen control card failure;
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④ touch screen signal line failure;
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⑤ The serial port of the PLC host is faulty;
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⑥ The PLC system fails;
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The preceding faults need to be rectified one by one