Description
Note: Many products are not yet listed. Please contact us for more product information. Our supply channels are constantly expanding, and we currently have 20 stable shared supply channels. Please confirm the model, product, price, and all other necessary information with customer service before placing an order. We offer new, refurbished, and used products, and prices are adjusted according to the year of the item you require.
Product Introduction
When your Rockwell ControlLogix PLC system needs a high-density, cost-effective analog signal acquisition unit to realize real-time collection of on-site process parameters such as temperature, pressure and flow, this module acts as the core data perception hub.
It is a flagship 16-point analog input module from Allen-Bradley ControlLogix series, supporting 16 single-ended inputs, 8 differential inputs or 4 high-speed differential inputs, compatible with 0-20.5mA current and ±10.25V voltage standard industrial analog signals. It can seamlessly integrate with ControlLogix 5570/5580 series controllers, and the removable terminal block design (1756-TBCH/1756-TBS6H) allows for fast on-site wiring and maintenance without replacing the entire module. Its industrial-grade design fully adapts to harsh industrial site environments, making it a core replacement part for Rockwell ControlLogix PLC system maintenance and retrofit projects.
1756-IF16/A
1756-IF16/A
Key Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 1756-IF16/A |
| Product Type | 16-Point Analog Input Module |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Country of Origin | USA |
| Total Analog Input Channels | 16 single-ended / 8 differential / 4 high-speed differential |
| Supported Signal Types | 0-20.5mA current, ±10.25V / 0-5.125V voltage |
| Operating Temperature Range | 0°C ~ +60°C |
| Channel-to-Channel Isolation | None (single-ended design) |
| Compatible Terminal Blocks | 1756-TBCH, 1756-TBS6H |
| Installation Method | Standard ControlLogix chassis slot mounting |
| Dimensions | 120 × 120 × 40 mm |
| Net Weight | ~0.38 kg |
| Compatible Systems | Rockwell ControlLogix series PLC systems |
| Warranty | 12 months from delivery |
Field Application & Technical Pitfalls
Critical Industrial Scenarios
- **Large Petrochemical Plant Process Parameter Monitoring: Acts as the core analog signal acquisition unit for ControlLogix PLC systems in petrochemical production plants, realizing real-time collection of on-site temperature, pressure and flow signals, ensuring the accurate operation of the production process control system.
- **Automated Food & Beverage Production Line Process Control: Delivers reliable high-density signal acquisition performance for food and beverage production line control systems, adapting to clean workshop environments, meeting the continuous and stable operation requirements of automated production processes.
- **Water Treatment Plant On-Site Instrument Signal Collection: Adapts to humid and dusty water treatment workshop environments, providing stable analog signal acquisition support for the on-site flow, liquid level and pressure instrument system of the water treatment plant.
Non-Negotiable Technical Pitfalls
- ⚠️ Bold Warning 1: Never arbitrarily connect the input channel to a signal that exceeds the ±10.25V voltage range. The third signal channel will experience overvoltage that causes the module’s internal ADC to burn out.
- ⚠️ Bold Warning 2: Skipping the pre-commissioning full channel calibration test will leave you with hidden measurement deviation risks. This module must confirm all 16 channels’ measurement accuracy fully meets Rockwell industrial PLC specifications before putting into operation.
- ⚠️ Bold Warning 3: Do not arbitrarily use non-matching non-1756 series standard terminal blocks for wiring. The third signal channel will experience poor contact that causes the analog signal to fluctuate abnormally.
A large petrochemical plant maintenance team once swapped an Allen-Bradley 1756-IF16/A module and skipped the full channel calibration test. The hidden single temperature channel measurement deviation exceeded 5%, causing the reactor temperature control to deviate, resulting in a 1.5-hour partial shutdown of the production unit.
Quality Control (QC) SOP & Transparency
- Inbound Verification: Cross-check the OEM serial number against Rockwell Automation’s official ControlLogix part registry, confirm the part number 1756-IF16/A matches the factory label, and inspect no bent pins or corrosion on all backplane and signal connectors.
- Live Rig Testing: Power the unit in a calibrated ControlLogix system test bench, connect to standard analog signal generator, and confirm full 2-hour continuous stable data acquisition operation.
- Parameter Testing: Verify all 16 analog input channels operate correctly, confirm the measurement accuracy meets factory specifications, and validate all status LED indicators and EtherNet/IP communication functions work properly.
- Final QA & Packaging: Seal the tested module in a static-shielding anti-static bag, attach a unique QC passed serial label, and nest it in foam padding inside a rigid industrial shipping carton.
Frequently Asked Questions (FAQ)
- Can I hot-swap this module while the ControlLogix PLC system is running? Yes, it supports ControlLogix backplane hot-swap function, but you must first confirm that the corresponding process control loop is in manual safe state before removing the unit, otherwise you will trigger unexpected process data loss risks.
- What exact systems is this module compatible with? It works natively with Rockwell ControlLogix series PLC systems, and cannot be directly used in non-ControlLogix PLC systems without custom adaptation.
- How long is the standard warranty for this new surplus unit? 12 months from delivery. It covers all manufacturing defects, but does not extend to units damaged by miswiring, overvoltage signal input, or improper terminal block matching in the field.
- How do I tell a genuine OEM unit apart from a refurbished clone? Genuine Allen-Bradley 1756-IF16/A modules have a laser-etched part number on the PCB, not a printed sticker. Clone units almost always fail the full 16-channel measurement accuracy test.
- What is the typical lead time for shipment? In-stock units ship within 48 hours. If you require official Rockwell Automation factory analog input performance test documentation, add 2 extra business days to the turnaround window.
- Can this module replace the older 1756-IF16 non-A version legacy unit? Well, technically it fits the same standard ControlLogix chassis slot footprint, but you must confirm the ControlLogix controller firmware version fully supports the A-series module before replacement to ensure 100% system compatibility.
