Allen-Bradley 1756-IF8I FW 2.012 PLC Module
High-performance 8-channel isolated analog input module with firmware version 2.012 for ControlLogix systems.
Core Hardware Specifications
- Channels: 8 independently isolated analog inputs (differential/single-ended)
- Signal Types: Independently configurable per channel:
- Voltage: ±10V, 0–10V, 0–5V, 1–5V
- Current: 0–20mA, 4–20mA (2-wire/4-wire transmitters)
- Resolution: 24-bit Σ-Δ ADC
- Isolation: 300V DC between channels and backplane
- Scan Time: ≤ 8 ms (8-channel full scan, typical)
- Accuracy: ±0.15% of full scale (25°C typical)
- Power Supply: Backplane 5.1V DC / 200 mA; 24V DC / 400 mA (current source)
- Power Consumption: Voltage mode 4.6 W; Current source mode 10.6 W
Dimensions and Logistics
- Body Dimensions: ControlLogix single-slot width
- Packaging Dimensions: Approximately 15 × 10 × 8 cm
- Volumetric Weight: Approximately 0.0012 m³
- Shipping Weight: 0.5 kg gross weight
Firmware 2.012 Specifications
Version and Compatibility
- Applicable Series: Only 1756-IF8I Series B (Series A supports up to firmware 1.x)
- Release Date: Approximately 2021–2022
- AOP Requirements: Add-On Profile v40.12.23 or later for Studio 5000 / RSLogix 5000
- Controller Compatibility: ControlLogix 5580/5570/5560 Series
Important Firmware Notice
Known Issue: Firmware 2.012 has a connection timeout error that may cause module assertion failure. The module records diagnostic data and enters a fault state (OK light remains red), preventing controller connection.
Recovery Method: Power cycle the module (RIUP hot-swapping is ineffective) to restore normal operation.
Fixed Version: This issue is resolved in version 2.013 and later.
Functional Capabilities
- Open-circuit detection (current input only, <2.5mA trigger at 4–20mA)
- Digital filtering, process alarm, and open-circuit detection
- Does not support HART communication (acquires 4–20mA DC component only)
- Requires external 24V DC power supply for transmitters
Software and Environmental Specifications
- Programming Software: Studio 5000 / RSLogix 5000
- Firmware Upgrade Tool: ControlFlash / ControlFlashPlus
- Certifications: CE, UL, cULus, CSA
- Operating Temperature: 0°C to +60°C
- Protection Rating: IP20 (cabinet mounting)