IP3312-Bxxx, IE3312 Signal Connection
4 Channel Analog Input Thermocouple
The temperature compensation is brought to the outside in the IP/IE3312 modules. This means that in the connector the temperature compensation is measured directly at the connection point. This allows the temperature to be measured with significantly better accuracy. Beckhoff offer a connector (ZS2000-3712) for this. The temperature compensation can also be carried out at a location other than the Fieldbus Box. You must then wire a PT1000 between pins 1 and 3. The longer the cables you choose to use, the larger is the measurement error caused by the length of the conductor, conductor losses and interference.
Pin 5 (shield) is capacitatively coupled to the chassis of your Fieldbus Box.
Supply voltage
US - supplies the electronics for the fieldbus and for the sensor. It is electrically isolated from UP.
UP - Is not required for the function of the module, and does not have to be fed in.
If you use UP to pass the power on, and you connect a module in which US and UP are not electrically isolated (e.g. any digital module) then the electrical isolation is removed by the downstream connection.
LED indicators - meanings
There is a green Run LED and a red Error LED for each channel.
The Run LED illuminates when data is being transferred to the D/A
converter. The red Error LED indicates that there is an error
(broken conductor, measured value outside the range, temperature
compensation outside the valid range).
The device is functioning correctly if the Run LED is lit and the
Error LED is unlit.
