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HORNER MODULES FOR GE FANUC PLCs - MILLIVOLT / STRAIN GAGE
The HE693ADC406 is a millivolt input module which allows millivolt level signals such as bridged strain gages (load cells) to be directly connected to the PLC without external signal processing (transducers, transmitters, etc.). All analog and digital processing of the signal is performed on the module, and millivolt values are written to the PLC %AI input table with 14-bit resolution. The module features 4 channels, and an input range selectable from +/- 25mV, +/- 50mV, or +/- 100mv. The input range is selectable for all 4 channels through the configuration software. Selectable digital filtering can assist in providing a steady input signal in noisy environments. Field wiring is made to a removable 20-pin terminal strip.
Horner's strain gage modules, the HE693STG883 and 884, take the functionality of the ADC406 one step further. Signal processing is still performed on the modules but the millivolt values written to the Series 90-30 PLC have 16 bit resolution. The input range of the STG883 is +/- 20mV, +/- 25mV, or +/- 30mV. The input range of the STG884 is +/- 25mV, +/- 50mV, or +/- 100mV. Individual channels can be turned off to reduce scan time. Another ability of these modules is to monitor the load cell excitation voltage, and compensate for variations in this signal. Excitation voltage output is not supplied. These units feature a setpoint for each channel, set with %AQ values and enunciated with %I inputs. Outputs (%Q) allow the ladder logic to trigger the module to perform a ZERO, TARE, or CLEAR function, critical for weighing applications.
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ADC406 |
STG883 |
STG884 |
| Number
of Channels |
4 |
8 |
| Sample
Rate |
35 channels/second |
| Input
Rate |
+/- 25mV, +/-
50mV, +/- 100mV |
+/- 20mV,
+/- 25mV,
+/- 30mV |
+/- 25mV, +/-
50mV, +/- 100mV |
| Resolution |
3uV, 6uV, 9uV (respectively) |
0.6uV, 0.8uV, 0.9uV (respectively) |
.8uV, 1.6uV, 3.2uV (respectively) |
| Accuracy |
+/- 0.05% |
+/- 0.3% |
| Power
Consumption |
100mA @ 5VDC |
60mA @5VDC, 30mA @ 24VDC |
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