The 6B Series input modules accept signals from thermocouples, RTD's, millivolt, voltage, and process current signals. Each analog input signal is conditioned and scaled by a programmable - gain amplifier and digitized by a 16 - bit integrating converter under microprocessor control. The digitized value is passed serially across a magnetically-isolated barrier (1500 V rms for Models 6B11, 6B12, 6B13; 2500 V rms for Models 6B11HV, 6B12HV, 6B13HV) and clocked in by a custom controller chip. The on-board microprocessor then converts the data into engineering units as determined by the channel parameters. In between conversions, the microprocessor auto-zeros the offset and gain by monitoring the on-board temperature and compensating for reference drift. Cold junction compensation (CJC) is also performed at this stage. The modules use these compensation factors to ensure the highest accuracy possible.
The 6B11 and 6B11HV linearize and compensate J, K, T, E, R, S and B thermocouples. These modules also digitize millivolt and voltage ranges from ±15 mV to ±5 V as well as process current inputs, 0 mA to 20 mA. The 6B12 and 6B12HV accept millivolt inputs from ±150 to ±500mV, voltage inputs from ±1 to ±50 V, and process current inputs. The 6B13 and 6B13HV linearize platinum, nickel, and copper RTDs. All modules return data in engineering units, or as a percentage of full scale range.
Software utilities included with the 6B Series User's Manual are used to configure the 6B11, 6B11HV, 6B12, 6B12HV, 6B13 and 6B13HV modules for address, input range, baud rate, data format, checksum status, and integration time. All programmable parameters are stored in the non-volatile memory of the module.