6B12

The 6B12 and 6B12HV are single-channel isolated signalconditioning modules which receive milli-volt, voltage and process current signals. Unlike conventional signal conditioners,the 6B12 and 6B12HV are complete microcomputer-based data acquisition systems. A major advantage of the on-board microcontroller is its ability to be reconfigured for various sensor types and input ranges.

Synchronized Sampling The synchronized sampling command allows data to be sampled simultaneously from all 6B11, 6B11HV, 6B12, 6B12HV modules and all 6B50 boards in a 6B Series system. Each module or board stores the data in a separate register within its microcontroller and can access the data with a separate command.

Software Configuration The 6B12 and 6B12HV digitize millivolt and voltage ranges from +150 mV to +50 V as well as 0 to +20 mA process current inputs. Software is used to configure the 6B12 and 6B12HV modules for address, input range, baud rate data format, checksum status and integration time. All programmable parameters are stored in the nonvolatile memory of the module.

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 Model 6B12, 2500 V rms Model 6B12HV) and clocked in by a custom controller chip. The onboard 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 6B12 and 6B12HV use compensation factors to ensure the highest accuracy possible.