I have wired an LM34 temp sensor to ADC(1). The sensor outputs 10mV per degree F. I scan the port once a second.
The actual bits monitored at the PLC can vary from 600mV to 640mV, which gives a temperature variation of 60 to 64 degrees. Very unstable.
Vs is wired to +5V ref.
Grn is wired to 0V
Vout is wired to ADC(1)
I have experimented with the sensor wired to a 16bit DAC card and found it to be stable when read at 16bits.
Do I have something misconfigured?
Thanks.
Alan