1756-IF8 1756IF8 AB AB Non-Isolated Analog Voltage/Current Input Module

1756-IF8 1756IF8 AB AB Non-Isolated Analog Voltage/Current Input Module

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Product Details

The AB 1756-IF8 is a non-isolated analog voltage/current input module. This module is compatible with the ControlLogix system and has 8 single-ended, 4 differential, or 2 high-speed differential inputs available. It requires a removable terminal block housing, or RTB, that has 36 pins, namely the 1756-TBS6H or the 1756-TBCH before it can be connected to the chassis. The 1756-IF8 has a user-configurable voltage range and you can choose from +/- 10.25 Volts with a resolution of 320 µV/count (15 bits plus sign bipolar), 0 to 10.25 Volts with a resolution of 160 µV/count (16 bits), 0 to 5.125 Volts with a resolution of 80 µV/count (16 bits), and 0 to 20.5 milliamps with a resolution of 0.32 µA/count (16 bits).

The 1756-IF8 can be wired in three different ways: single-ended wiring, differential wiring, and high-speed mode differential wiring. In single-ended wiring, all the input devices are tied to a common ground and it allows the comparison of one side of the signal input to the signal ground. The difference is then used by the module in generating digital data for the controller. Using the single-ended wiring method maximizes the number of the module's usable channels. You should use differential wiring when your applications can have separate signal pairs or common ground is unavailable and when you need improved noise immunity in your environment. Channels in this wiring method are not totally isolated from each other. But when you need the fastest data updates possible, you should use the high-speed mode differential wiring method. Note that this mode only allows the use of one out of every four channels on the module. Specific features of the 1756-IF8 include the module filter, under-range/over-range detection, process alarms, wire off detection, multiple input ranges, real-time sampling, digital filter, and rate alarms. Its backplane voltage and current ratings are 5.1 Volts DC, 150 milliamps maximum, 24 Volts DC, and 40 milliamps maximum. It has an input current range of 4 to 20 milliamps and an input voltage range of -10 to 10 Volts. Power consumption is 1.73 Watts and the maximum overvoltage protection is 30 Volts DC (voltage) and 8 Volts DC (current).

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