Allen-Bradley 1756-IF8 ControlLogix Programmable Automation Controller (PAC)

The Allen-Bradley 1756-IF8 is an analog input module from the ControlLogix Programmable Automation Controller (PAC) family. This analog input module features Eight (8) input channels that are configurable for a variety of input signals such as +/-10VDC, 0-10VDC and 0-5VDC Voltage signals and 0-20 mA Current signals. This module is typically used to interface analog signal generating instruments and devices such as transmitters, transducers, signal splitters, signal isolators, panel meters and other similarly capable devices. The 1756-IF8 is a single slot module with a high-resolution of conversion. It has varying resolution, from 15-bit to 16-bit. Specific module resolution is ±10.25V: 320 μV/count (15 bits plus sign bipolar) for +/-10VDC, 160 μV/count (16 bits); for 0-10VDC, 80 μ/V count (16 bits); for 0-5VDC and 0…20.5mA: 0.32 μA/count (16 bits) for 0-20 mA signals.

There is virtually no limit to the number of installation instances of this module. Most ControlLogix controllers are capable of up to 4000 analog I/O signals. The 1756-IF8 may be installed in the local chassis along the controller or within distributed I/O racks.

Technical specifications for 1756-IF8

ManufacturerRockwell Automation

Backplane Current (24Volts)40 mA

Power Dissipation (Max)Voltage mode: 1.73 W Current mode: 2.33 W

Backplane Current (5Volts)150 mA

Module TypeAnalog Input

SeriesControlLogix

Part Number/Catalog No.1756-IF8

BrandAllen-Bradley

No. of Inputs8- channel Voltage / Current inputs

Conversion MethodSigma-Delta

Data formatInteger mode (left justified, 2 s complement) IEEE 32-bit floating point

Input signal Range-10…10V 0…10V 0…5V 0…20 mA

Input Resolution±10.25V: 320 μV/count (15 bits plus sign bipolar) 0…10.25V: 160 μV/count (16 bits) 0…5.125V: 80 μ/V count (16 bits) 0…20.5mA: 0.32 μA/count (16 bits)

Inputs2 high-speed differential, 4 differential, 8 single-ended

Input Resolution(+--) 10.25 Volts, 0-5.125 Volts, 0-10.25 Volts

Removeable Terminal Blocks1756-TBCH, 1756-TBS6H

Power Consumption1.73 Watts

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