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Description
Technical Description 1769-IF8:
Allen-Bradley’s 1769-IF8 Compact I/O analog input module is an analog input module with eight (8) differential inputs in voltage ranges of +/-10 volt DC, 0 to 10 volt DC, 0 to 5 volt DC, and 1 to 5 volt DC, with current ranges of 0 to 20 mah and 4 to 0 mah.
The floor current of the 1769-IF8 is 120 mah at 5 volt DC and 70 mah at 24 volt DC, and it emits 3.64 watts of heat when operating. It uses a Delta-Sima analog-to-digital converter with 16-bit unipolar or 15-bit plus resolution. Its channel response speed depends on the filter/configuration. It has a maximum bus current of 120 mA at 5 volt DC and 70 mA at 24 volt DC, and an input impedance of 220 kg at voltage and 250 ohms at current.
The 1769-IF8 has a common-mode mismatch voltage range of +/-10 volts DC per channel and a common-mode rejection ratio greater than 60 dB at 50 to 60 Hz. The overall accuracy of voltage signal and current signal of the analog input module is +/-0.2% and 0.35% respectively, while the overall drift accuracy of voltage signal and current signal is +/-0.003% and +/-0.0045% respectively. It also has +/-0.03% input nonlinearity and +/-0.03% repeatability. The 1769-IF8 has an indicator indicating the module failure status. The 1769-IF8 automatically self-diagnoses overrange or underrange with bit-by-bit reporting and can also handle alarms. The maximum input terminal overload of the voltage terminal is +/-30 DC continuous current at 0.1 MA and +/-32 mA at +/-7.6 DC. It operates in a temperature range of 0 to 60 degrees Celsius (32 to 140 degrees Fahrenheit), with a relative humidity limit of 95 percent and condensation. It weighs about 450 grams (0.99 lb) and measures about 118 x 87 x 52.5 mm.
The 1769-IF8 is a compact I/O module built by Allen-Bradley that is compatible with the 1769 CompactLogix controller and the MicroLogix 1500 controller. The controller has eight (8) input channels embedded and supports differential and single-ended wiring.
Configurable signals are 0-20 mah, 4-20 mah and +/10 volts DC, 1-5 volts DC, 0-5 volts DC, 0-10 volts DC.
The Delta – Sima conversion method is used to convert the analog signal received by the input channel separately. The converted signal is stored in the processor’s memory, occupying 16 bits of unipolar and 15 bits of bipolar. In the register is an array of bits representing the input signal values. To correctly display equivalent measured or engineered values, the data is adjusted using scaling instructions. Processing data can be configured as engineering units, scale as PID, percentage range and raw data.
The 1769-IF8 has a power distance rating of 8 modules. This refers to the physical module position, which means it must not be installed more than 8 modules away from the 1769 CompactLogix power supply. This power distance rating ensures that the module will receive the appropriate backplane power supply.
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1769-IF8
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