6B11 / 6B11HV

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GENERAL DESCRIPTION

The 6B11 and 6B11HV are single-channel isolated signal-

conditioning modules which accept the outputs from

thermocouple, milli-volt, voltage, and process current signals.

Unlike conventional signal conditioners, the 6B11 and 6B11HV

are complete microcomputer-based data acquisition systems. A

major advantage of the onboard microcontroller is its ability to

be remotely 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 6B11 and 6B11HV linearize and

compensate J, K, T, E, R, S and B thermocouples. Additionally,

these modules also digitize milli-volt and voltage ranges from

+15mV to +5V as well as 0 to +20mA process current inputs.

Software is used to configure the 6B11 and 6B11HV modules

for address, input range, baud rae, 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 6B11, 2500 V rms – Model

6B11HV) 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 6B11 and 6B11HV use

compensation factors to ensure the highest accuracy possible.

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Figure 2