Upper and lower limits of analog input values are set to 20 and 0 , had everything normal, in the absence of the analog signal access , the software displays a value of 0 , there is signal access , they also have a normal display, but under normal use two or three days , the upper and lower limits remain unchanged, the analog input value in the Nanda PLC Programmable Logic Controller absence of wiring is 6.8 , all the channels I have tried are 6.8 , then the company gave me a new simulation input module , installed after the beginning is normal, but it is the same problem in a couple of days later , I ask an expert what causes ? Urgent
Also this PLC as well as a relay output module , 2, 3 and 4-channel connection of solenoid valves, found often there will be a problem , sometimes when I start solenoid valve, status lights all of a sudden relay output modules are extinguished , the network does not pass , after a minute or so , PLC will automatically linked to the network, the solenoid valve to start this and what is the reason ? I have checked the wiring before , are not the problem
You said power module before I checked, input 220V, power module output is 5.09V, I then adjust it to 5.01V, it should be no problem , there is no good suggestions, thank you
Solenoid valve and flow meter ( analog input signal ) is Nanda plc analog input output io module a common 24V signal output transformer specification is 24V, 10A, PLC power supply is independent 220V! The first question : single look very bad judgment, but you said with the second question, I guess : 1, power solenoid valve is not you , and the same power to the PLC , the capacity is not enough power , the solenoid valve is energized when the voltage is pulled down , resulting in the second question . 2, the PLC analog input module often run power surge , a long time cause damage to the module .
Suggestions : plc output not directly with solenoid valve , intermediate relay over it. Separate power supply , and the capacity to be enough .
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