Allen-Bradley 1746-NI4 Analog I/O Module

• Series                           SLC 500
• Module Type                   Analog I/O Module
• Backplane Current (5 Volts) 25 milliamps
• Backplane Current (24 Volts DC) 85 milliamps
• Input signal Category -20 to +20 mA (or) -10 to +10V dc
• Bandwidth                  10 Hertz
• Current Input Coding -16,384 to +16,384
• Update Time                  512 microseconds
• Voltage Input Coding -32,768 to +32,767
• Resolution                  16 bits

The Allen Bradley 1746-NI4 is an SLC 500 Four (4) Channel Analog Input Module. It has user-selectable analog channels for voltage or current to support multiple monitoring and control applications; it has a 16-bit resolution and contains a removable terminal block that provides connections analog input channel. This channel can be connected as a differential input. There is a DIP that switches on the circuit board to select the input or current voltage. The Backplane current at 5 Volts of this module is 25 mA; at 24 Volts, the current is 85 mA. Caution should be given to avoid connecting the voltage source without the transmitter current, etc. to the channel configured for current input. Incorrect module operation or module damage may occur.

The 1746-NI4 has Standard Cable Lengths of 0.5, 1, 2.5, and 5.0 meters. The AIFM Connector of this module is 15-pin D-shell. The Allen Bradley 1746-NI4 has Current Loop Input Specifications: the input range is +/-20 mA (nominal) and +/-30 mA (maximum). The Input impedance is 250 Ohms with a resolution of 1.22070 & µA per LSB and an approximate Gain error drift of +/-67 ppm/degrees Celsius. The overall accuracy at 25 degrees Celsius is +/- 0.365% of full scale, +/- 0.642% at 60 degrees Celsius. The overall accuracy drift is +79 ppm/degree Celsius of full scale. The 1746-NI4’s input voltage range is +/-10 Volts DC -1 LSB. Its impedance is 1 mega Ohms. The accuracy drift is +63 ppm/ degrees Celsius of full scale. The Resolution is 305.176 & µV per LSB, with a Gain error drift at +/- 57 ppm/degree Celsius. The Overall accuracy at 25 degrees Celsius is +/-0.284% of full scale, and +/-0.504% at 60 degrees Celsius.

The 1746-NI4 is an analog input module from the SLC 500 series of Allen-Bradley. It features Four (4) differential non-isolated input channels, individually selectable for voltage or current input. Selectable input signals ranges include -20 to +20 mA (or) -10 to +10V dc.

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