Allen-Bradley 1756-IR6I Isolated RTD Input Module – ControlLogix 1756 Series
Imagine a critical continuous casting line or a high-temperature chemical reactor running without reliable temperature feedback. A single sensor drift or ground-loop interference can cascade into product defects, equipment damage, or unplanned shutdowns costing tens of thousands of dollars per hour. The Allen-Bradley 1756-IR6I was engineered precisely to eliminate that risk — delivering channel-to-channel isolation that keeps your RTD signals clean, accurate, and immune to ground-loop noise even in the harshest industrial environments.
Within the Rockwell Automation ControlLogix 1756 platform, the 1756-IR6I occupies a specialized niche: it is the isolated-channel variant of the RTD input family, distinguishing itself from the non-isolated 1756-IR6 by providing full galvanic separation between each of its six input channels. This architecture makes it the preferred choice for applications where sensors are physically distributed across different ground potentials — a common reality in large-scale process plants, steel mills, and energy facilities. Globally, the ControlLogix 1756 series remains one of the most widely deployed PAC platforms, and the 1756-IR6I is a trusted component in thousands of installations across six continents.
Technical Specifications
- Catalog Number: 1756-IR6I
- Series: ControlLogix 1756
- Manufacturer: Allen-Bradley / Rockwell Automation
- Number of Input Channels: 6 (individually isolated)
- Input Type: RTD (Resistance Temperature Detector)
- Supported RTD Types: 100 Ω Platinum (PT100), 200 Ω Platinum, 500 Ω Platinum, 1000 Ω Platinum, 10 Ω Copper, 120 Ω Nickel, 200 Ω Nickel, 500 Ω Nickel
- Wire Configuration: 2-wire, 3-wire, 4-wire
- Channel Isolation: Channel-to-channel isolated
- Backplane Current (5 VDC): 250 mA
- Backplane Current (24 VDC): 2 mA
- Operating Temperature: 0 °C to 60 °C (32 °F to 140 °F)
- Storage Temperature: -40 °C to 85 °C
- Relative Humidity: 5% to 95% (non-condensing)
- Module Weight: Approx. 260 g
- Certifications: UL, CE, C-Tick (refer to official Rockwell documentation for full certification list)
Note: Always verify specifications against the official Rockwell Automation publication 1756-TD006 before engineering design.
Key Features & Benefits
- Full Channel-to-Channel Isolation: Eliminates ground loops between sensors at different electrical potentials, protecting signal integrity across distributed measurement points.
- Broad RTD Compatibility: Supports all major RTD types and resistance ranges, reducing the need for signal conditioners and simplifying panel design.
- 2/3/4-Wire Flexibility: Accommodates existing field wiring configurations without requiring sensor replacement or additional hardware.
- Native ControlLogix Integration: Communicates directly over the ControlLogix backplane; configuration and diagnostics are handled entirely within Studio 5000 Logix Designer — no additional drivers required.
- Real-Time Diagnostics: Provides open-wire detection and over-range/under-range fault reporting, enabling predictive maintenance and faster fault isolation.
- Hot-Swap Capable: Supports removal and insertion under power (RIUP) when used in a ControlLogix chassis, minimizing downtime during module replacement.
- Scalable Architecture: Mix and match with other 1756 I/O modules in the same chassis to build a tailored, high-density control system.
Industry & Equipment Applications
- Oil & Gas: Pipeline temperature monitoring, refinery process control, wellhead automation
- Metals & Mining: Furnace temperature control, continuous casting, rolling mill process loops
- Chemical & Petrochemical: Reactor temperature management, distillation column control
- Power Generation: Turbine inlet/exhaust monitoring, boiler control systems
- Food & Beverage: Pasteurization, sterilization, and CIP temperature verification
- Pharmaceuticals: Autoclave and bioreactor temperature validation (21 CFR Part 11 environments)
- Water & Wastewater: Process temperature monitoring in treatment facilities
System Integration & Compatible Parts
The 1756-IR6I is designed to operate within the Rockwell Automation ControlLogix ecosystem. Compatible and commonly paired components include:
- Chassis: 1756-A4, 1756-A7, 1756-A10, 1756-A13, 1756-A17
- Power Supplies: 1756-PA72, 1756-PB72, 1756-PA75, 1756-PB75
- Controllers: 1756-L71, 1756-L72, 1756-L73, 1756-L74, 1756-L75, 1756-L81E, 1756-L82E, 1756-L83E, 1756-L84E, 1756-L85E
- Communication Modules: 1756-EN2T, 1756-EN2TR, 1756-EN3TR (EtherNet/IP); 1756-DNB (DeviceNet); 1756-CN2 (ControlNet)
- Related I/O: 1756-IR6 (non-isolated RTD), 1756-IT6I (isolated thermocouple input), 1756-OF8 (analog output)
- Wiring System: 1492-IFM series interface modules for structured field wiring
Our Quality Assurance Process
At Konmask.com, every Allen-Bradley 1756-IR6I unit we supply undergoes a structured verification process before shipment:
- Source Verification: Units are sourced from authorized distributors or verified surplus channels with documented chain of custody.
- Visual Inspection: Physical examination of housing, connectors, label integrity, and firmware revision markings.
- Functional Check: Where applicable, modules are bench-tested for backplane communication and channel response prior to dispatch.
- Packaging: Anti-static packaging with moisture barrier and shock-absorbing foam to protect against transit damage.
- Documentation: Certificate of conformance and test report available upon request.
How to Order
- Submit an inquiry via the “Request a Quote” button or email support@konmask.com.
- Provide your required quantity, delivery timeline, and destination country.
- Our team will respond within 1 business day with availability, lead time, and a formal quotation.
- Upon order confirmation, we arrange export documentation, freight, and insurance as required.
- Track your shipment with our dedicated logistics update service.
We support EXW, FOB, CIF, and DDP Incoterms. Payment via T/T, L/C, and Western Union accepted.
Why Choose Konmask.com?
- Industrial Automation Specialists: We focus exclusively on PLC, DCS, and automation hardware — not a generalist marketplace.
- Global Export Experience: We have shipped to over 40 countries with full export compliance documentation.
- Responsive Technical Support: Our team includes engineers with hands-on ControlLogix experience who can assist with compatibility and integration questions.
- Competitive Lead Times: Extensive supplier network enables fast sourcing even for discontinued or hard-to-find part numbers.
- Transparent Communication: No hidden fees. Clear quotations, honest lead times, and proactive shipment updates.
Frequently Asked Questions
Q: What is the difference between the 1756-IR6I and the 1756-IR6?
A: The 1756-IR6I provides channel-to-channel isolation, meaning each of the six RTD input channels is galvanically separated from the others. The 1756-IR6 is non-isolated. The isolated version is required when sensors are connected to equipment at different ground potentials to prevent ground loops and measurement errors.
Q: Can the 1756-IR6I be used in a 1756 ControlLogix chassis with other I/O modules?
A: Yes. The 1756-IR6I is a standard ControlLogix 1756 form-factor module and can be installed in any slot of a 1756 chassis alongside other 1756 series modules.
Q: Does the 1756-IR6I support hot-swap (RIUP)?
A: Yes, the module supports Removal and Insertion Under Power when the chassis is properly configured, allowing replacement without shutting down the entire system.
Q: What software is required to configure the 1756-IR6I?
A: Configuration is performed using Rockwell Automation’s Studio 5000 Logix Designer (or RSLogix 5000 for legacy projects). No third-party software is required.
Q: Do you provide a warranty or return policy?
A: Yes. We offer a standard warranty period on all units. Please contact support@konmask.com for specific warranty terms applicable to your order.
Q: Can you supply multiple units or fulfill a blanket purchase order?
A: Yes. We regularly fulfill both single-unit emergency orders and multi-unit project orders. Contact us to discuss volume pricing and scheduled delivery options.
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