中文版
Description
The Allen Bradley High-resolution Isolated Analog Module 1771-NR has a 16-bit input resolution
and a 14-bit output resolution. The RTD Excitation Current of this module is 1 mA (typical). Its input
overvoltage protection is 140 Volts AC RMS continuous while the Offset Drift is ±25 mΩ/degree Celsius,
the Gain Drift being ±50 ppm/degree Celsius. This unit has a calibration value of 1.00/649.0 Ω and an input
bandwidth of 9 Hz. Its maximum update time is 25 milliseconds, making it time efficient; the underrange threshold
of this unit equals 0.9 Ω and the overrange threshold equals 650 Ω. The 1771-NR is supplied as open type equipment,
intended for use in industrial environments no more than Pollution 2 (as defined in EN / IEC0664-1) when applied in a Zone 2 environment. The enclosure should be accessible only by means of the appliance.
1771-NR
The 1771-NR dissipates power at 5 Volts of 6 Watts; the operating temperature fluctuates between 0 and 60 degrees
Celsius (32 to 140 degrees Fahrenheit) while the storage temperature lies between -40 and 85 degrees Celsius
(-40 to 185 degrees Fahrenheit). This unit has a relative humidity of around 5% to 95% without condensation and the
maximum backplane current of this module is 1.2 A. Disconnect power from the 1771 I/O chassis socket and disconnect
the cable from the module before removing or installing the I/O module. Failure to remove power from the backplane can cause damage and performance issues, or personal injury.
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