Product Details
Product Description
Product Description
Focus on DCS, PLC, robot control system and large servo system.
Main products: various modules / cards, controllers, touch screens, servo drivers.
Advantages: supply of imported original products, professional production parts,
Fast delivery, accurate delivery time,
The main brands include ABB Bailey, Ge / fuanc, Foxboro, Invensys Triconex, Bently, A-B Rockwell, Emerson, ovation, Motorola, xyvom, Honeywell, Rexroth, KUKA, Ni, Deif, Yokogawa, Woodward, Ryan, Schneider, Yaskawa, Moog, prosoft and other brands
Note The recommended SCXI-1304 or SCXI-1305 terminal block has all necessary circuitry for AC or DC coupling and for floating or ground-referenced signals. The SCXI-1304 AC/DC Coupling Terminal Block Installation Guide and SCXI-1305 AC/DC Coupling BNC Terminal Block Installation Guide have instructions for signal connection. Figures 2-2 through 2-5 provide supplemental information on connecting signals to the SCXI-1141/1142/1143 module. Figure 2-1 illustrates how to connect a ground-referenced signal source to an SCXI-1141/1142/1143 module channel. Figure 2-1. Ground-Referenced Signal Connection IN– IN+ SCXI-1141/1142/1143 Chapter 2 Connecting Signals © National Instruments Corporation 2-5 SCXI-1141/1142/1143 User Manual Figure 2-2 illustrates how to connect a non-referenced (floating) signal source to an SCXI channel. Figure 2-2. Floating Signal Connection For AC-coupled signals, connect an external resistor from the AC-coupled input channel to ground. This provides a DC path for the amplifier input bias current. Typical resistor values range from 100 kΩ to 10 MΩ. This solution, although necessary, lowers the input impedance of the channel and introduces an additional DC offset voltage proportional to the product of the input bias current and the resistor value used. Using a 1 MΩ resistor results in ±200 µV of offset, which is insignificant in most applications. However, if you use larger-valued bias resistors, significant input offset can result. Lower-valued bias resistors increase loading of the source, which can result in gain error. Figures 2-3 through 2-5 illustrate how to connect AC-coupled signals. Figure 2-3. Ground-Referenced AC-Coupled Signal Connection A GND 100 kΩ A SCXI-1141/1142/1143 IN– IN+ 1µF 1MΩ SCXI-1141/1142/1143 IN– IN+ Chapter 2 Connecting Signals SCXI-1141/1142/1143 User Manual 2-6 Figure 2-4. Ground Offset AC-Coupled Signal Connection Figure 2-5. Floating AC-Coupled Signal Connection Digital Input and Output You can use the EXT CLK input pin on the front connector of the SCXI-1141/1142/1143 module to control filter cutoff frequency for special purposes. The clock should be a TTL-logic-level or CMOS-logic-level square wave, with a frequency of less than 2.5 MHz that is 100 times the desired cutoff frequency. The absolute maximum input voltage for the EXT CLK pin is 5.5 V with respect to D GND; the minimum input voltage is –0.5 V. The OUT CLK pin on the front connector is a CMOS-logic-level output clock, which you can configure to have a frequency that is proportional to filter cutoff frequency. See Chapter 4, Theory of Operation, for more details on using these two signals
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