DESCRIPTION:
- 2 full-bridge strain gauge inputs
- Data output rate configurable from 2.5 Hz to 7.5 kHz
The module is equipped with 2 inputs for evaluating full-bridge strain gauges and works with both 4-wire and 6-wire strain gauge load cells. The concept applied by the module requires calibration in the measurement system. This calibration compensates or eliminates the absolute inaccuracies in the measurement circuit (e.g. component tolerances, effective bridge voltage or zero offset). The measuring accuracy related to an absolute (calibrated) value only changes due to the negative influence of a change in the operating temperature.
Short description
| I/O module | 2 full-bridge strain gauge inputs |
General information
| B&R ID code | 0x8820 |
| Status indicators | Channel status, operating state, module status |
| Diagnostics | |
| Module run/error | Yes, using LED status indicator and software |
| Open circuit | Yes, using LED status indicator and software |
| Input | Yes, using LED status indicator and software |
| Connection type | |
| X2X Link | M12, B-coded |
| Inputs | 4x M12, A-coded |
| I/O power supply | M8, 4-pin |
| Power consumption | |
| Bus | 0.75 W |
| Internal I/O | 2.4 W |
| Certifications | |
| CE | Yes |
| UKCA | Yes |
| ATEX | Zone 2, II 3G Ex nA IIA T5 Gc
IP67, Ta = 0 - Max. 60°C
TÜV 05 ATEX 7201X |
| UL | cULus E115267
Industrial control equipment |
| HazLoc | cCSAus 244665
Process control equipment
for hazardous locations
Class I, Division 2, Groups ABCD, T5 |
| EAC | Yes |
| KC | Yes |
I/O power supply
| Nominal voltage | 24 VDC |
| Voltage range | 18 to 30 VDC |
| Integrated protection | Reverse polarity protection |
Full-bridge strain gauge
| Strain gauge factor | 2 to 256 mV/V, configurable using software |
| Connection | 4- or 6-wire connections |
| Input type | Differential, used to evaluate a full-bridge strain gauge |
| Digital converter resolution | 24-bit |
| Conversion time | Depends on the configured data output rate |
| Data output rate | 2.5 to 7,500 samples per second, configurable using software (fDATA) |
| Input filter | |
| Cutoff frequency | 5 kHz |
| Order | 3 |
| Slope | 60 dB |
| ADC filter characteristics | Sigma-delta, see section "Filter characteristics of the sigma-delta A/D converter" |
| Operating range / Measurement sensor | 85 to 5,000 Ω |
| Influence of cable length | See section "Calculation example", sensor cable length: Max. 30 m |
| Input protection | RC protection |
| Common-mode range | 0 to 3 VDC
Permissible input voltage range (with regard to the electric potential strain gauge GND) on inputs "Input +" and "Input -" |
| Insulation voltage between input and bus | 500 Veff |
| Conversion procedure | Sigma-delta |
| Output of digital value | |
| Broken bridge supply line | Value approaching 0 |
| Broken sensor line | Value approaching ±end value (status bit "Line monitoring" is set in register "Module status") |
| Valid range of values | 0xFF800001 to 0x007FFFFF (-8,388,607 to 8,388,607) |
| Strain gauge supply | |
| Voltage | 5.5 VDC / Max. 65 mA |
| Short-circuit and overload-proof | Yes |
| Voltage drop for short-circuit protection | Max. 0.2 VDC at 65 mA and 25°C |
| Quantization | |
| LSB value (16-bit) | |
| 2 mV/V | 336 nV |
| 4 mV/V | 671 nV |
| 8 mV/V | 1.343 µV |
| 16 mV/V | 2.686 µV |
| 32 mV/V | 5.371 µV |
| 64 mV/V | 10.74 µV |
| 128 mV/V | 21.48 µV |
| 256 mV/V | 42.97 µV |
| LSB value (24-bit) | |
| 2 mV/V | 1.31 nV |
| 4 mV/V | 2.62 nV |
| 8 mV/V | 5.25 nV |
| 16 mV/V | 10.49 nV |
| 32 mV/V | 20.98 nV |
| 64 mV/V | 41.96 nV |
| 128 mV/V | 83.92 nV |
| 256 mV/V | 167.85 nV |
| Max. gain drift | 12 ppm/°C |
| Max. offset drift | 2 ppm/°C |
| Nonlinearity | <10 ppm |
Electrical properties
| Electrical isolation | Bus isolated from analog input and strain gauge supply voltage
Channel not isolated from I/O power supply
|
Operating conditions
| Mounting orientation | |
| Horizontal | Yes |
| Vertical | Yes |
| Installation elevation above sea level | |
| 0 to 2000 m | No limitation |
| >2000 m | Reduction of ambient temperature by 0.5°C per 100 m |
| Degree of protection per EN 60529 | IP67 |
Ambient conditions
| Temperature | |
| Operation | -25 to 60°C |
| Derating | - |
| Storage | -40 to 85°C |
| Transport | -40 to 85°C |
Mechanical properties
| Dimensions | |
| Width | 53 mm |
| Height | 85 mm |
| Depth | 42 mm |
| Weight | 190 g |
| Torque for connections | |
| M8 | Max. 0.4 Nm |
| M12 | Max. 0.6 Nm |
