Thinking_hard Posted February 12, 2008 Report Posted February 12, 2008 Hi! Please help. I'm really puzzled by this. I've got a FX2N-32MR base unit. I'm trying to connect a 0-10V pressure transducer to the FX2N-2AD voltage input. But when I switched on the PLC and the FX2N-2AD, the voltage reading gives me -2.8V. The specs of my transducer states that it operates in the range of 0-10V. So the negative voltage is completely strange. The thing is when I disconnect the FX2N-2AD from my base unit, the voltage reading gives a normal 3.6V reading. But when I reconnect the FX2N-2AD to the base unit, the voltage drops again to negative. What am I doing wrong??? My pressure transducer gives a internal impedance of 202Mohms. That means it shouldn't interfere with the FX2N-2AD unit. Please help.
Crossbow Posted February 12, 2008 Report Posted February 12, 2008 Did you already write the code to configure the module for 0-10VDC. The default may be something else.
Thinking_hard Posted February 12, 2008 Author Report Posted February 12, 2008 Yes... I've already written the code. But I think the problem is something else. Just for clarification, my voltage reading is taken from a voltmeter measured across the inputs of the FX2N-2AD, not the digital reading taken from the PLC using GX developer. The voltage reading is positive (3.8V) before connecting FX2N-2AD to the base unit, but after connection drops to negative 2.8V. Thanks for the reply...
panic mode Posted February 26, 2008 Report Posted February 26, 2008 can you post connection diagram of your circuit so we can take a closer look it?
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