Allen-Bradley 1756-IC16 — 16-Point 48V DC Digital Input Module | ControlLogix Platform
Engineering Background
The 1756-IC16 is a high-density digital input module designed for Rockwell Automation’s ControlLogix chassis-based control architecture. Operating at 48V DC, it is purpose-built for industrial environments where legacy field devices, solenoids, and sensors output 48V DC signals — a voltage level common in telecommunications-adjacent process plants, European-standard machinery, and legacy DCS migration projects. The module integrates directly into the 1756 backplane, communicating via the ControlLogix high-speed backplane bus at up to 200 Mbps.
Product Positioning
For procurement engineers sourcing ControlLogix I/O to expand existing control panels or replace failed modules, the 1756-IC16 fills a specific niche: 48V DC field-side compatibility with full ControlLogix diagnostics, tag-based programming, and producer/consumer communication. It is not interchangeable with 24V DC variants (e.g., 1756-IB16) — voltage compatibility must be confirmed against field wiring before ordering.
Complete Technical Specifications
| Catalog Number | 1756-IC16 |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Platform | ControlLogix 1756 |
| Module Type | Digital Input (D/I) |
| Number of Points | 16 inputs |
| Input Voltage (Nominal) | 48V DC |
| Input Voltage Range | 30–60V DC |
| Input Current (per point) | Approx. 8 mA @ 48V DC |
| ON-State Voltage Min. | 30V DC |
| OFF-State Voltage Max. | 10V DC |
| Input Impedance | ~6 kΩ |
| Isolation | Group isolated (2 groups of 8), 250V AC continuous |
| Response Time (OFF→ON) | ≤ 2 ms (hardware filter off) |
| Response Time (ON→OFF) | ≤ 2 ms (hardware filter off) |
| Backplane Current Draw | 120 mA @ 5.1V DC; 3 mA @ 24V DC |
| Power Dissipation | 0.61 W (module only) |
| Operating Temperature | 0°C to 60°C (32°F to 140°F) |
| Storage Temperature | -40°C to 85°C |
| Relative Humidity | 5–95% non-condensing |
| Wiring Type | Removable terminal block (RTB), 1756-TBCH or 1756-TBS6H |
| Indicators | Per-point I/O status LEDs; Module status LED |
| Certifications | UL, CE, C-Tick, FM Class I Div 2 |
| Weight | Approx. 180 g |
| Dimensions | Standard 1756 single-slot module |
Proven Application Environments
- Telecommunications power plants — 48V DC is the standard bus voltage; field sensors and status contacts output 48V DC natively
- Legacy DCS migration projects — replacing older 48V DC I/O racks with ControlLogix while reusing existing field wiring
- European industrial machinery — EN-standard equipment frequently uses 48V DC for control circuits
- Oil & gas upstream — wellhead panels with 48V DC solar/battery power systems
- Mining & minerals processing — high-noise environments where 48V DC provides better noise immunity than 24V DC
- Native 48V DC compatibility — eliminates signal converters or interposing relays, reducing panel complexity and failure points
- Group isolation — two isolated groups of 8 points allow mixed common references without cross-interference
- Configurable input filters — hardware and software filters adjustable from 0 to 30 ms for noise rejection in high-EMI environments
- Producer/Consumer model — multicast data sharing across ControlLogix chassis without additional programming overhead
- Per-point diagnostics — individual point status LEDs and RSLogix 5000 / Studio 5000 tag-level fault reporting
- Hot-swap capable — module can be removed and replaced under power without chassis shutdown (with appropriate safety precautions)
- Removable terminal block — field wiring stays connected during module replacement, minimizing downtime
- Source: Verified surplus and authorized distribution channels; no counterfeit risk — all units inspected before listing
- Condition: New surplus (sealed) or refurbished to OEM specification — clearly stated per listing
- Firmware: Modules ship with factory firmware; version confirmed on request
- Testing: Functional bench-test available on request prior to shipment
- Documentation: Rockwell Automation publication 1756-UM058 (User Manual) available for download from Rockwell’s literature library
- Warranty: 12-month Konmask warranty against defects in materials and workmanship
- Confirm compatibility — verify your field wiring is 48V DC and your chassis/controller firmware meets minimum requirements
- Request a quote — contact support@konmask.com with quantity, required delivery date, and any condition preferences
- Order confirmation — receive proforma invoice with lead time and shipping options (DHL Express, FedEx International Priority, sea freight for bulk)
- Quality inspection — pre-shipment photos and test report provided on request
- Shipment & tracking — real-time tracking number issued; export documentation (CO, packing list, commercial invoice) included
- After-sales support — technical commissioning support available via email or video call
Engineering Advantages
System Architecture & Signal Flow
Field devices (switches, proximity sensors, relay contacts) wired to the 1756-IC16 terminal block present a 48V DC signal. The module’s input circuitry filters and conditions the signal, then converts it to a logic-level state. This state is written to the module’s input image table and broadcast across the ControlLogix backplane via the producer/consumer protocol. The ControlLogix controller (e.g., 1756-L8x series) reads the input tag in the ladder/function block program at each scan cycle. Timestamping is available for Coordinated System Time (CST) synchronization across distributed chassis.
Compatible Controllers: All 1756 ControlLogix controllers (1756-L55, L6x, L7x, L8x series) running RSLogix 5000 v13+ or Studio 5000 Logix Designer v21+.
Compatible Chassis: All 1756 chassis (4, 7, 10, 13, 17-slot).
Required Accessories: 1756-TBCH (36-pin cage clamp RTB) or 1756-TBS6H (36-pin spring clamp RTB) — sold separately.
Sourcing & Quality Verification
Procurement Process
Technical FAQ
Q: Can I use the 1756-IC16 with 24V DC field devices?
A: No. The minimum ON-state voltage is 30V DC. Using 24V DC signals will result in unreliable or no input recognition. Use the 1756-IB16 for 24V DC applications.
Q: Is the 1756-IC16 compatible with FLEX I/O or CompactLogix?
A: No. This module is exclusively for the 1756 ControlLogix chassis backplane. It is not compatible with 1794 FLEX I/O or 1769 CompactLogix systems.
Q: What terminal block do I need?
A: The 1756-TBCH (cage clamp) or 1756-TBS6H (spring clamp) 36-pin RTB is required. The terminal block is not included with the module and must be ordered separately.
Q: Can this module be used in a Safety (GuardLogix) application?
A: No. The 1756-IC16 is a standard (non-safety) module. For SIL-rated safety applications, use the 1756-IB16S or equivalent safety-rated I/O.
Q: What is the lead time for this module?
A: In-stock units typically ship within 1–3 business days. Contact us for current stock status and expedited options.
Q: Do you provide a certificate of conformance?
A: Yes, a certificate of conformance and inspection report are available upon request for all orders.
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