Description
The Allen-Bradley 1756-IF4 is a 4-channel analog input module designed for the ControlLogix platform, engineered for process measurement applications across discrete and heavy industrial automation architectures.
In field deployments, this module receives voltage or current analog signals from transmitters, thermocouples, or process sensors, converting them into digital values for controller processing in compliance with IEC 61131 standards.
Technical Specifications
| Parameter | Value |
| Manufacturer | Rockwell Automation (Allen-Bradley) |
| Product Family | ControlLogix (Bulletin 1756) |
| Catalog Number / Model | 1756-IF4 |
| Module Type | Analog Input Module |
| Number of Inputs | 4 differential or single-ended channels |
| Input Signal Ranges | ±10 V, 0 to 10 V, 1 to 5 V, 0 to 20 mA, 4 to 20 mA |
| Resolution | 15 bits plus sign (binary) or 16 bits (depending on configuration range) |
| Backplane Current Draw | 150 mA at 5.1 V DC; 20 mA at 24 V DC |
| Total Backplane Power | Approx. 1.25 W |
| Enclosure Protection | IP20 (open-style chassis module) |
| Operating Temperature | 0 to +60 °C |
Procurement and Availability
- Condition: New Surplus / Factory Sealed / Refurbished Tested options available upon request.
- Lead Time: 1 to 3 business days for stock items; verify factory allocation for legacy components.
- Warranty: 12-month standard warranty from date of shipment.
- Price: Indicative market pricing applies. Price subject to market conditions; contact us for a firm quote.
Integration and Compatibility Notes
The 1756-IF4 module mounts in any standard 1756 ControlLogix chassis and requires a compatible Removable Terminal Block (RTB) such as the 1756-TBNH or 1756-TBSH for field-side wiring connections.
- Chassis Placement: Can be positioned in any local or remote ControlLogix chassis linked via EtherNet/IP or ControlNet networks.
- Shield Grounding: Ensure proper shield grounding of instrumentation cables to an external ground bus bar to minimize electromagnetic interference (EMI) in high-noise industrial settings.
- Software Configuration: Configured natively through Studio 5000 Logix Designer or RSLogix 5000 using standard module configuration profiles.
Frequently Asked Questions
Q: Is the 1756-IF4 module individually isolated across channels? A: No. The 1756-IF4 provides backplane isolation and channel-to-common isolation, but individual channels are not completely isolated from one another. Verify sensor isolation requirements if utilizing unisolated transmitters.
Q: What terminal block housing is required for this module? A: The module utilizes standard 1756 RTB housing models (such as 1756-TBNH or 1756-TBSH), which must be ordered separately.
Q: Can this module process thermocouple inputs directly without a dedicated temperature card? A: While voltage ranges can technically scale down, thermocouples require cold-junction compensation (CJC). For dedicated thermocouple inputs, use a specialized module like the 1756-IT16 instead.
