Overview
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 1769-IQ32 |
| Brand | Allen Bradley |
| Product Type | Digital Input Module |
| Product Line | CompactLogix |
| UPC | 611320915655 |
| Number of Inputs | 32 |
| Input Groups | 4 groups of 8 inputs |
| Nominal Input Voltage | 24 VDC |
| Input Delay | 8 ms ON delay and 8 ms OFF delay |
| Minimum ON-State Voltage | 10 VDC |
| Minimum ON-State Current | 2 mA |
| Maximum OFF-State Voltage | 5 VDC |
| Maximum OFF-State Current | 1.5 mA |
| Maximum Inrush Current | 250 mA |
| Current Draw at 5.1 V | 170 mA |
| Maximum Heat Dissipation | 4.6 W |
| Weight | 1.31 lb (0.60 kg) |
Input Signal Processing
The 1769-IQ32 receives discrete field signals and determines their ON or OFF states according to its input voltage and current thresholds. A signal must meet the specified minimum ON-state conditions to register as active. Conversely, the specified maximum OFF-state voltage and current define the conditions for recognizing an inactive input.
The 8 ms ON and OFF input delays affect how quickly the module recognizes changes in field signal states. When evaluating the module for an application, account for these delays alongside the response times of the field devices and controller logic.
Channel Grouping and System Loading
The four groups of eight inputs provide a structured arrangement for 32 discrete signal points. This grouping is useful when planning channel allocation and field wiring. Confirm the module’s terminal assignments and group wiring requirements against the applicable wiring documentation before connecting field devices.
The module draws 170 mA from the 5.1 V backplane supply and dissipates up to 4.6 W of heat. Include these values when checking the available power budget and thermal loading of the installed system.
Frequently Asked Questions
Q: How many digital input signals can the 1769-IQ32 handle?
A: The module supports 32 digital inputs arranged in four groups of eight. Each channel receives a discrete field signal for ON/OFF state detection.
Q: What voltage conditions define an ON or OFF input?
A: The specified minimum ON-state voltage is 10 VDC, with a minimum ON-state current of 2 mA. The maximum OFF-state voltage is 5 VDC, and the maximum OFF-state current is 1.5 mA. Ensure that the connected field devices meet the applicable input requirements.
Q: What power and thermal values should be checked before installation?
A: Allow for a backplane current draw of 170 mA at 5.1 V and maximum heat dissipation of 4.6 W. Verify the available power capacity and installation requirements for the intended CompactLogix configuration.
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