Allen Bradley 1756-IF8I ControlLogix 8-Channel Independently Isolated Analog Input Module
1. Product Overview 📌
The 1756-IF8I belongs to Rockwell Allen‑Bradley ControlLogix PLC series, an 8‑channel analog input expansion module with full independent channel isolation. It collects continuous analog voltage/current signals from field transmitters, temperature sensors, pressure gauges, flow meters and liquid level sensors, converts analog physical signals into digital data, and transmits digital signals to the ControlLogix main CPU via rack backplane.
This module serves as the signal acquisition gateway of automated process control systems. It supports channel-by-channel signal configuration, converts field physical parameters (temperature, pressure, flow, liquid level, concentration) into readable engineering values for PLC logic operation, closed-loop PID regulation, HMI data display, remote SCADA monitoring and production data recording. Independent channel isolation effectively avoids cross-channel signal interference caused by ground loops in multi-sensor wiring.
2. Core Product Advantages ✨
🛡️ 8 Fully Independent Channel Isolation (Core Highlight)
Each of the 8 channels adopts reinforced galvanic isolation; isolation withstand voltage reaches 250V continuous. No signal crosstalk between channels, completely eliminate ground loop noise interference. Ideal for multi-point long-distance wiring workshops with complicated grounding conditions.
📊 High 24-bit Precision & Multiple Configurable Ranges
24-bit high-resolution conversion ensures ultra-precise signal collection; each channel can be individually set to voltage mode or current mode. Optional ranges: ±10.5V, 0~10.5V, 0~5.25V, 0~21mA, 4~20mA, compatible with mainstream industrial two-wire transmitters. Calibration accuracy ≤0.1% full scale at room temperature, stable measurement for precision production lines.
🔧 Rich Built-in Diagnosis & Software Configurable Functions
Support open-circuit detection, over-range/under-range alarm, signal rate-of-change alarm and sensor deviation alarm. Digital filter, 50/60Hz notch filter, channel scaling to engineering units are fully configurable via Studio 5000 software. Built-in loop power supply for passive transmitters without external auxiliary power supply.
📶 Strong Industrial Anti-interference Performance
Pass strict EMC industrial certification: 6kV contact ESD protection, ±4kV EFT surge immunity, 120dB common-mode noise rejection at 50/60Hz. Stable operation near inverters, motors and welding equipment with heavy electromagnetic disturbance.
🧩 Easy Wiring & System Compatibility
Single-slot ControlLogix rack installation; matched with 1756-TBCH screw terminal base or 1756-TBNH spring terminal base. Differential input design improves anti-noise performance and allows longer signal cable laying. Supports IEEE 32-bit floating-point /16-bit integer data format for easy PLC programming and data reading.
🌡️ Wide Temperature & Rugged Industrial Design
Working temperature range: 0℃ ~ +60℃, tolerates large ambient temperature fluctuations in factories. Overvoltage, reverse polarity and short-circuit protection on all channels to prevent module burnout from field wiring errors.
3. Complete Technical Parameter Table
| Item |
Detailed Specification |
| Model |
1756-IF8I (ControlLogix Isolated Analog Input Module) |
| Number of Channels |
8 fully isolated independent channels |
| Supported Signal Types |
Voltage / Current configurable per channel |
| Voltage Input Ranges |
±10.5 V DC, 0~10.5 V DC, 0~5.25 V DC |
| Current Input Ranges |
0~21 mA DC, 4~20 mA DC |
| Resolution |
24-bit high precision |
| Channel Isolation |
Independent channel-to-backplane, channel-to-channel isolation, 250V continuous isolation rating |
| Input Impedance |
10MΩ (voltage mode); 250Ω (current mode) |
| Accuracy |
≤0.1% full scale at 25℃ |
| Built-in Functions |
Open wire detection, over/under range alarm, digital filter, notch filter, PID scaling, channel calibration |
| Backplane Power Draw |
5.1V DC: 900mA; 24V DC: 40mA |
| Power Consumption |
Max 1.73W |
| Terminal Matching |
1756-TBCH (screw terminal), 1756-TBNH (spring terminal) |
| Installation |
Single slot on standard 1756 ControlLogix DIN rack |
| Overall Dimension |
W 59.7 mm × H 102 mm × D 124 mm |
| Net Weight |
250g |
| Operating Temperature |
0℃ ~ +60℃ |
| Humidity |
5%~95% non-condensing |
| Certifications |
CE, UL, cUL, CSA, RoHS |
| Programming Software |
Studio 5000 Logix Designer |
| Data Format |
16-bit integer / IEEE 32-bit floating point |
4. Applicable Industries & Usage Scenarios 🎯
Covered Major Industries
-
Water Treatment Industry
Collect 4-20mA signals of water pressure, flow, pH value, liquid level of sewage, purified water and chemical dosing systems; isolated design avoids ground interference of multi-pump rooms.
-
Petrochemical & Fine Chemical
Monitor reactor temperature, pipeline pressure, raw material flow, tank liquid level; independent isolation ensures stable measurement in flammable, high-electromagnetic chemical workshops.
-
Food & Beverage Processing
Track oven temperature, pipeline flow, cleaning liquid concentration of filling, baking and CIP cleaning lines; alarms remind abnormal sensor signals to guarantee food production stability.
-
Pharmaceutical Manufacturing
Control purified water temperature, pressure, medium flow of pharmaceutical batching and sterilization lines; high precision meets pharmaceutical GMP monitoring requirements.
-
HVAC & Central Air-conditioning
Collect cooling water temperature, wind pressure, refrigerant flow data for building intelligent temperature control and energy-saving adjustment.
-
General Machinery & Packaging Equipment
Temperature and pressure signal acquisition of injection molding machines, extruders, automatic filling and packaging machines.
Scene Description
Installed inside electrical control cabinet on ControlLogix rack. Field sensors connect module terminals via shielded cables. All analog data is uploaded to CPU for automatic control; real-time data is displayed on HMI, and abnormal values trigger automatic interlock protection.
Warehouse Supply Instruction
All modules are original Allen‑Bradley new genuine goods, packed with independent anti-static cartons. Unique serial number for full lifecycle traceability. Stored in constant-temperature, dust-proof and moisture-proof electronic warehouse. Complete accessories include terminal blocks, user manuals and certification documents. Support bulk order and sample delivery with official 12-month global warranty.
Your message must be between 20-3,000 characters!
