RTD & Resistance Analog Input Solution — Allen-Bradley 1756-IR12 | ControlLogix
The Allen-Bradley 1756-IR12 is a 12-channel RTD and resistance analog input module designed for the ControlLogix platform. It delivers high-accuracy temperature and resistance measurement for demanding industrial process control environments where precision and reliability are non-negotiable.
Where This Product Is Used
The 1756-IR12 is specified across a wide range of industries and applications where accurate temperature sensing is critical:
- Oil & Gas Processing — Pipeline temperature monitoring, heat exchanger control, and wellhead automation
- Chemical & Petrochemical Plants — Reactor temperature profiling, distillation column control, and batch process management
- Power Generation — Turbine bearing temperature monitoring, boiler feed water control, and generator winding protection
- Pharmaceutical Manufacturing — Validated temperature logging for sterilization, lyophilization, and clean-room HVAC
- Food & Beverage — Pasteurization temperature control, CIP cycle monitoring, and cold-chain verification
- Water & Wastewater Treatment — Digester temperature control and process fluid monitoring
- Metals & Mining — Furnace temperature profiling, conveyor motor thermal protection
- Building Automation (Large Facilities) — Central plant chiller and boiler temperature integration with ControlLogix supervisory systems
Technical Specifications
- Catalog Number: 1756-IR12
- Platform: Allen-Bradley ControlLogix (1756 chassis)
- Input Channels: 12 single-ended RTD / resistance inputs
- Input Types: 100 Ω Platinum (PT100), 200 Ω Platinum, 500 Ω Platinum, 1000 Ω Platinum; Nickel 120 Ω; Copper 10 Ω; custom resistance (0–1000 Ω)
- Temperature Range: –200 °C to +870 °C (sensor dependent)
- Resolution: 16-bit
- Accuracy: ±0.1 °C typical (PT100, at 25 °C ambient)
- Excitation Current: 1 mA per channel
- Wiring: 2-wire, 3-wire, or 4-wire RTD configurations
- Backplane Current Draw: 125 mA @ 5 VDC; 2 mA @ 24 VDC
- Power Dissipation: 0.675 W
- Operating Temperature: 0 °C to +60 °C
- Storage Temperature: –40 °C to +85 °C
- Relative Humidity: 5–95% non-condensing
- Dimensions (H × W × D): 94.0 × 94.0 × 58.0 mm (3.70 × 3.70 × 2.28 in)
- Weight: 250 g (approx.)
- Enclosure Rating: Open-type (chassis-mounted)
Why Engineers Specify This Model
- 12 Isolated Channels in One Slot — High channel density reduces chassis slot consumption and overall system cost versus single-channel alternatives
- Multi-Wire RTD Support — Native 2-, 3-, and 4-wire configurations eliminate the need for external signal conditioners
- Direct ControlLogix Integration — Plug-and-play with Studio 5000 Logix Designer; no custom driver development required
- Per-Channel Diagnostics — Open-circuit, short-circuit, and over/under-range detection reported directly to the controller tag database
- Linearization On-Board — Hardware linearization for all supported RTD curves; engineering-unit values delivered directly to the PLC program
- Firmware-Upgradeable — Field-upgradeable firmware via ControlLogix backplane for long service life
- Proven Field Record — Widely deployed in SIL-rated and non-SIL process control systems globally since introduction
Complete System Bill of Materials
A typical ControlLogix node using the 1756-IR12 requires the following components:
- 1756-IR12 — RTD/Resistance Analog Input Module (this item)
- 1756-Lxx — ControlLogix L-series Controller (e.g., 1756-L85E)
- 1756-Axx — ControlLogix Chassis (e.g., 1756-A7, 1756-A10, 1756-A13)
- 1756-PAxx / 1756-PBxx — ControlLogix Power Supply (AC or DC)
- 1756-EN2T / 1756-EN3TR — EtherNet/IP Communication Module (if network connectivity required)
- 1492-IFM40F — Interface Module / Terminal Block (recommended for field wiring)
- 1756-TBxx — Removable Terminal Block (RTB) for module field wiring
- Shielded, twisted-pair RTD cable (Belden 9501 or equivalent)
Contact Konmask for complete BOM pricing and availability on all line items.
Compliance & Industry Standards
- IEC 60751 — Platinum resistance thermometers (PT100/PT1000)
- UL Listed — UL 508 (Industrial Control Equipment)
- CE Marked — EMC Directive 2014/30/EU; Low Voltage Directive 2014/35/EU
- RoHS Compliant — Directive 2011/65/EU
- ATEX / IECEx — Suitable for use with certified barriers in Zone 2 / Class I Div 2 installations (verify with project EIC)
- ISA-S5.1 — Instrumentation symbology compatibility
- Rockwell Automation Product Certification — Full certification documentation available via Rockwell’s Product Certification portal
Quality Assurance & Sourcing
Konmask.com sources the 1756-IR12 through verified industrial distribution channels. Every unit offered is subject to the following quality controls:
- Visual Inspection — Label integrity, connector condition, and housing checked against OEM reference standards
- Functional Verification — Where applicable, modules are bench-tested for backplane communication and channel response prior to dispatch
- Traceability — Lot codes and date codes recorded for full supply-chain traceability
- Packaging — ESD-safe anti-static bags, foam-lined cartons; original OEM packaging preserved where available
- Warranty — 12-month Konmask warranty against defects in materials and workmanship; RMA process available
We do not sell counterfeit, refurbished-as-new, or grey-market product. Authenticity concerns? Request a certificate of conformance with your order.
How to Source This Part
- Add to Cart — Click the purchase button above to place an order directly online
- Request a Quote — Email support@konmask.com with your required quantity, delivery timeline, and project details for a formal quotation
- Bulk / Project Orders — For orders of 5+ units or full BOM sourcing, contact our industrial sales team for volume pricing
- Lead Time — Standard in-stock orders ship within 1–3 business days; ex-stock availability confirmed at time of order
- Export Orders — We support international shipments with full commercial invoice and packing list documentation; EAR99 classification — no export license typically required
Application-Specific FAQ
Q: Can the 1756-IR12 accept thermocouple inputs?
A: No. The 1756-IR12 is designed exclusively for RTD and resistance inputs. For thermocouple inputs on the ControlLogix platform, specify the 1756-IT6I2 or 1756-IT6I modules instead.
Q: Is the 1756-IR12 compatible with all ControlLogix chassis?
A: Yes. The module is compatible with all standard 1756-series chassis (1756-A4, A7, A10, A13, A17) and the ControlLogix-XT (extreme temperature) chassis where the operating temperature range is met.
Q: What is the maximum cable length for RTD wiring?
A: Rockwell recommends a maximum loop resistance of 25 Ω for 2-wire configurations. For PT100 sensors with 0.385 Ω/m cable, this equates to approximately 30–60 m depending on wire gauge. Use 4-wire wiring to eliminate lead resistance error for longer runs.
Q: Can I mix RTD types on the same module?
A: Yes. Each channel is independently configurable in Studio 5000 Logix Designer, allowing different RTD types (e.g., PT100 on channels 0–7, Ni120 on channels 8–11) on the same module.
Q: Does the module support redundant controller configurations?
A: Yes. The 1756-IR12 is fully compatible with ControlLogix redundancy systems (1756-SRM) when used in a redundant chassis pair.
Q: What firmware version is required?
A: Refer to the Rockwell Automation Product Compatibility and Download Center (PCDC) for the minimum controller firmware revision required for your specific 1756-IR12 series letter.
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