The Allen-Bradley 1756-IF8I is an 8-Point General-Purpose Isolated Analog Current/Voltage Input Module. Any combination of Voltage or Current mode can be used in its channels. It requires a 36-pin removable terminal block housing (RTB) before it can be connected to the compatible ControlLogix chassis. The 1756-IF8I provides higher-level accuracy, performance, and configuration for voltage, current, or 2-wire transmitter current sourcing per channel. Note that this module does not offer the RTS parameter and the channel sampling rate is exclusively determined by the requested packet interval (RPI) value. This module has a variable input range and resolution that you can choose from -10 to 10 Volts with 1.49 µVolts/count, 0 to 10 Volts with 1.49 µVolts/count, 0 to 5 Volts with 1.49 µVolts/count, 0 to 20 milliamps with 2.99 nA/count. The 1756-IF8I has an internal loop power source, which is software user-configurable, on each channel. For you to do so, you first need to use the Current input type and enable Source Loop Current to use an internal power source on the channel. It should be noted that the source current is limited to about 45 milliamps and is capable of powering a two-wire transmitter directly without needing an external power supply.
An under-range/over-range detection feature is present in the 1756-IF8I. This lets you know when the isolated input module is operating beyond the limits set by the input range. This module also has process alarm and rate alarm features. Process alarms are triggered when the module has exceeded the configured high or low limits in every channel. Rate alarms, on the other hand, are triggered when the rate of change between input samples for every channel exceeds the specified trigger point for that particular channel. It also has an analog-to-digital converter (ADC) that is used to remove the line noise, known as noise immunity, in your application for every channel. The notch filter reduces the amplitude of the signal with minimal signal distortion. Aside from that, a digital filter is also present and this smooths input data noise transients on each input channel. The 1756-IF8I's synchronized sampling feature allows you to synchronize input sampling across inputs on multiple modules, which forces the inputs to sample simultaneously within around 20 µS of each other, even if the modules do not belong to the same chassis as long as the system clocks are synchronized through the CIP Sync. The module's sensor offset feature compensates for any known error on the channel to which the sensor is connected to or the sensor itself. A wire off detection feature is also present and this informs you when a wire lost connection with a channel or an RTB has been removed from the module.
Repair Services for 1756-IF8I
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Our highly skilled technicians can repair your ControlLogix 1756-IF8I. All our repairs come with a 1 Year Warranty. Please contact us for additional information about our repair process.
Revisions for 1756-IF8I
Please refer to the manual for more information about the 1756-IF8I such as the wiring diagrams, data sheets,
firmware information and migration or obsolescence details.
|Revision Part #
||Also Known as
||1756-IF8I/A, Series A, Rev A