SIEMENS module 6DD1683-0BC5

SIEMENS module 6DD1683-0BC5

Technical data of product parameters

When two 6DD1683-0BC5 dissimilar metals (a thermocouple) are joined together, a voltage (the
Seebeck Voltage) is generated between them. This voltage is directly related to the
temperature at the junction of the two metals. The relationship between the voltage
and the temperature can be best described by a fifth order polynomial, determined 6DD1683-0BC5
by the two types of metals that are joined.
To measure the voltage (Vt) between the two metals, a voltmeter (in this case, an
analog input card) must be connected to each wire (see Figure 6-9). Unfortunately,
this produces two new junctions and voltages (V1 and V2) between the terminals
and the thermocouples. The following formula is used to findIt is not possible to measure V1 and V2 without inducing more junctions and
voltages; therefore, the analog input subsystem has a temperature sensor on the
Personality module (1C31116G04) to measure the temperature (Tj) at the terminal
block of the base unit.
A conversion formula, determined from the junction metal and thermocouple
metals, is used to calculate the combined voltage of V1 and V2. This is called Cold 6DD1683-0BC5
Junction Compensation.Personality module 1C1116G04 of the analog input subsystem includes a
temperature sensor IC. This is used for measuring the temperature of the terminal
block to provide cold junction compensation for thermocouple inputs.
This module is used in conjunction with a terminal block cover (1C31207H01) to 6DD1683-0BC5
maintain a uniform temperature of the terminal block and sensor area. The cover fits
over an entire base; however, the sensor will only accurately measure the

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