Analysis and Design of a Modern SCADA System

this thesis the National Instruments PCI- 6251 was used which is a

high-speed multifunction M Series data acquisition (DAQ) board

optimized for superior accuracy at fast sampling rates; see Figure

4.2 and Table 4.1.

Figure 4.2: National Instruments PCI-6251 DAQ

Table 4.1: National Instruments PCI-6251 DAQ Specifications

Form FactorOS Support PCIWindows, Real (^) - Time, Linux, Mac OS
Measurement Type (^) Analog InputDigital, Frequency, Quadrature encoder, Voltage
Number of ChannelsSample Rate 16 SE/8 DI1.25 MS/s
ResolutionMaximum Voltage Range 16 bits-10..10 V (^)
Range AccuracyRange Sensitivity 1920 μV112 μV
Minimum Voltage RangeRange Accuracy - 52 μV100..100 mV
Range Number of RangesSensitivity 6 μV 7
On-Board Memory (^) Analog Output4095 samples
Number of ChannelsUpdate Rate 2 2.86 MS/s (^)
ResolutionMaximum Voltage Range 16 bits-10..10 V (^)
Range AccuracyMinimum Voltage Range 2080 μV-5..5 V
Range AccuracyCurrent Drive (Channel/Total) (^1045) 5 mAμV
Number of Channels Digital I/O24 DIO^
TimingMaximum Clock Rate Hardware, Software10 MHz
Logic LevelsMaximum Input Range TTL0..5 V (^)
Maximum Output RangeCurrent Drive (Channel/Total) 0..5 V24 mA/448 mA (^)
Number of Counter/Timers Counter/Timers 2
ResolutionMaximum Source Frequency 32 bits80 MHz (^)
Timebase StabilityNumber of DMA Channels 50 ppm 2