Allen-Bradley 1756-IB16I Isolated DC Input Module – ControlLogix 1756 Series
When a critical DC input signal fails to reach the PLC controller in a high-voltage industrial environment, the consequences cascade instantly — conveyor lines halt, process interlocks trip, and maintenance teams scramble to isolate a fault that could have been prevented. In facilities running mixed-voltage field devices, ground loops and transient noise are constant threats to signal integrity. The Allen-Bradley 1756-IB16I eliminates this vulnerability by providing full galvanic isolation on every one of its 16 input points, ensuring that field-side disturbances never corrupt controller-side logic — keeping your plant running when it matters most.
Within the ControlLogix 1756 platform — Rockwell Automation’s flagship high-performance PLC architecture — the 1756-IB16I occupies a specialized niche: isolated discrete DC input. While standard 1756-IB16 modules share a common input common, the IB16I variant delivers point-to-point isolation, making it the preferred choice for applications where field devices operate at different reference potentials or where regulatory standards demand strict electrical separation. Deployed across automotive assembly, oil & gas processing, water treatment, and semiconductor fabrication worldwide, this module is a cornerstone of mission-critical ControlLogix installations.
Technical Specifications
- Catalog Number: 1756-IB16I
- Platform: Allen-Bradley ControlLogix 1756 Series
- Module Type: Discrete DC Input, Isolated
- Number of Input Points: 16
- Isolation: Point-to-point isolated (each input independently isolated)
- Input Voltage Range: 10–31.2V DC
- Input Current (at 24V DC): Approx. 8 mA
- ON-State Voltage Min: 10V DC
- OFF-State Voltage Max: 5V DC
- Input Delay (OFF→ON / ON→OFF): Configurable via RSLogix 5000 / Studio 5000
- Backplane Current (5V DC): 75 mA
- Power Dissipation: 5.5 W (max)
- Operating Temperature: 0 to 60°C (32 to 140°F)
- Storage Temperature: -40 to 85°C
- Relative Humidity: 5–95% non-condensing
- Dimensions (H × W × D): 94.0 × 94.0 × 58.0 mm (approx.)
- Weight: 200 g (approx.)
- Certifications: UL, CE, C-Tick (verify current listing with Rockwell Automation)
Note: All specifications are sourced from publicly available Rockwell Automation documentation. Always verify against the official product datasheet before engineering design.
Key Features & Benefits
- Point-to-Point Galvanic Isolation: Each of the 16 inputs is independently isolated, eliminating ground loops and preventing cross-channel interference in mixed-reference field wiring environments.
- Wide DC Input Voltage Acceptance: Accepts 10–31.2V DC signals, compatible with the full range of 24V DC field devices including proximity sensors, limit switches, and push-button stations.
- Configurable Input Filter Times: Input delay is software-configurable via Studio 5000 Logix Designer, allowing engineers to tune noise rejection vs. response speed for each application.
- ControlLogix Backplane Integration: Communicates natively over the ControlLogix backplane, supporting producer/consumer messaging for deterministic data exchange with the L-series controller.
- Diagnostic Capabilities: Supports module-level and channel-level diagnostics accessible through RSLogix 5000 / Studio 5000, enabling rapid fault identification without physical inspection.
- Hot-Swap Capable: Can be inserted and removed from a powered ControlLogix chassis (with appropriate chassis and firmware support), minimizing downtime during module replacement.
- Compact 1756 Form Factor: Single-slot module fits any standard 1756 chassis (4, 7, 10, 13, or 17-slot), maximizing I/O density in panel space-constrained installations.
Industry & Equipment Applications
- Oil & Gas: Wellhead control panels, pipeline SCADA RTU expansion, compressor station safety interlocks — where isolated inputs prevent ground faults from propagating across hazardous-area boundaries.
- Automotive Manufacturing: Body-in-white welding lines, paint shop conveyor control, and press safety circuits requiring isolated feedback from high-current field devices.
- Water & Wastewater Treatment: Pump station control, chemical dosing interlocks, and level switch monitoring across geographically distributed sites with varying ground potentials.
- Semiconductor & Electronics Fabrication: Cleanroom equipment control where electrical noise immunity and signal integrity are paramount.
- Power Generation & Utilities: Substation automation, turbine control auxiliary I/O, and generator protection relay interface panels.
- Food & Beverage: CIP (Clean-in-Place) system interlocks, filling line sensor inputs, and packaging machine safety monitoring.
System Integration & Compatible Parts
The 1756-IB16I is designed for seamless integration within the Allen-Bradley ControlLogix ecosystem. Compatible and commonly paired components include:
- Controllers: 1756-L61, 1756-L62, 1756-L63, 1756-L71, 1756-L72, 1756-L73, 1756-L81E, 1756-L82E, 1756-L83E, 1756-L84E, 1756-L85E
- Chassis: 1756-A4, 1756-A7, 1756-A10, 1756-A13, 1756-A17
- Power Supplies: 1756-PA72, 1756-PB72, 1756-PA75, 1756-PB75
- Communication Modules: 1756-EN2T, 1756-EN2TR, 1756-EN3TR (EtherNet/IP); 1756-DNB (DeviceNet); 1756-CN2 (ControlNet)
- Wiring Systems: 1492-IFM series interface modules and pre-wired cables for 1756 I/O
- Related I/O Modules: 1756-OB16I (isolated DC output), 1756-IB32 (non-isolated 32-point DC input), 1756-IA16I (isolated AC input)
Contact Konmask.com to confirm compatibility with your specific firmware revision and chassis configuration.
Our Quality Assurance Process
At Konmask.com, every Allen-Bradley 1756-IB16I module offered undergoes a structured sourcing and verification process before it reaches your facility:
- Authorized & Verified Supply Chain: We source exclusively from traceable supply channels. Each unit is accompanied by documentation supporting its provenance.
- Visual & Physical Inspection: Modules are inspected for label integrity, connector condition, housing damage, and firmware label consistency prior to dispatch.
- Functional Verification (where applicable): Select stock undergoes bench-level power-on and backplane communication checks using ControlLogix test chassis.
- Anti-Counterfeit Screening: We apply Rockwell Automation’s published counterfeit identification guidelines to every unit, including hologram verification, label font inspection, and weight cross-check.
- Secure Packaging: Modules are shipped in ESD-safe packaging with desiccant, inside rigid outer cartons, to prevent transit damage.
How to Order
- Step 1 — Submit an Inquiry: Use the contact form on this page or email support@konmask.com with your required quantity, delivery timeline, and destination country.
- Step 2 — Receive a Quotation: Our team will respond within 1 business day with pricing, lead time, and shipping options tailored to your location.
- Step 3 — Order Confirmation: Confirm the order via email or purchase order. We accept T/T bank transfer and other B2B payment methods.
- Step 4 — Shipment & Tracking: Your order is dispatched with full tracking. Export documentation is provided for international shipments upon request.
For urgent requirements or large-volume orders, call us directly at +0086 19859288691.
Why Choose Konmask.com?
- Industrial Automation Specialists: We focus exclusively on PLC, DCS, and industrial control components — not a generalist electronics distributor. Our team understands your application.
- Global Export Experience: We ship Allen-Bradley, Siemens, Schneider, ABB, and other automation brands to customers across Southeast Asia, the Middle East, Europe, and the Americas.
- Responsive Technical Support: Pre-sales engineering consultation available to help you confirm compatibility, firmware requirements, and system architecture.
- Competitive Lead Times: Extensive network of supply partners allows us to source hard-to-find and obsolete ControlLogix modules with shorter lead times than standard distribution.
- Transparent Documentation: We provide full traceability documentation, test reports (where available), and export paperwork to support your procurement compliance requirements.
Frequently Asked Questions
Q: What is the difference between the 1756-IB16I and the 1756-IB16?
A: The 1756-IB16I provides point-to-point isolation on each of its 16 input channels, meaning each input has its own independent common. The standard 1756-IB16 uses a shared common across all inputs. The IB16I is required when field devices operate at different reference potentials or when electrical isolation between channels is mandated by safety or regulatory requirements.
Q: Is the 1756-IB16I compatible with ControlLogix L8x (5580) controllers?
A: Yes. The 1756-IB16I is compatible with the full range of ControlLogix controllers including the current-generation 5580 series (1756-L81E through 1756-L85E), provided the chassis and power supply are correctly sized. Always verify firmware compatibility in Studio 5000 Logix Designer before commissioning.
Q: Can the 1756-IB16I be used in a GuardLogix safety system?
A: The 1756-IB16I is a standard (non-safety-rated) discrete input module and is not certified for use as a safety I/O module in SIL-rated GuardLogix applications. For safety-rated isolated inputs, refer to the 1756-IB16IS or the POINT Guard I/O family.
Q: What wiring system is recommended for the 1756-IB16I?
A: Rockwell Automation recommends using 1492-IFM series interface modules with pre-wired cables (1492-CABLE series) to simplify field wiring and reduce installation errors. Direct wiring to the module’s RTB (Removable Terminal Block) is also supported.
Q: Do you provide export documentation for international orders?
A: Yes. Konmask.com provides commercial invoices, packing lists, and certificates of origin for all international shipments. Additional documentation such as material safety data sheets or test reports can be arranged upon request.
Q: What is your minimum order quantity (MOQ)?
A: We accommodate single-unit inquiries as well as bulk orders. There is no strict MOQ — contact us with your requirement and we will provide the best available pricing for your quantity.
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Contact: support@konmask.com | +0086 19859288691
