Allen-Bradley 1746-IB16/C – 16-Point 24VDC Sink DC Input Module | SLC 500 Series
Engineering Background
The Allen-Bradley 1746-IB16/C is a discrete DC input module designed for the SLC 500 modular I/O chassis. It belongs to the 1746 I/O family — Rockwell Automation’s proven platform for factory-floor signal acquisition in discrete manufacturing, process control, and machine automation environments. Revision /C reflects a mature, field-hardened hardware iteration with enhanced noise immunity and tightened input threshold tolerances.
Product Positioning
This module is the standard choice for engineers integrating 24VDC sinking field devices — proximity sensors, pushbuttons, limit switches, and photoelectric sensors — into SLC 500 control architectures. Its 16-point density balances channel count with chassis slot economy, making it a workhorse in both OEM machine builds and plant-wide retrofit projects.
Complete Technical Specifications
| Catalog Number | 1746-IB16/C |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Series / Platform | SLC 500 (1746 I/O) |
| Module Type | Discrete DC Input |
| Number of Input Points | 16 |
| Input Voltage Range | 10–30 VDC |
| Nominal Input Voltage | 24 VDC |
| Input Current (at 24VDC) | 8.5 mA typical |
| Input Type | Sinking (NPN) |
| ON-State Voltage Threshold | ≥ 10 VDC |
| OFF-State Voltage Threshold | ≤ 5 VDC |
| Input Impedance | 2.8 kΩ |
| Isolation | 1500 VAC (field side to backplane) |
| Response Time (OFF→ON) | ≤ 1 ms |
| Response Time (ON→OFF) | ≤ 1 ms |
| Backplane Current Draw (5VDC) | 75 mA |
| Power Dissipation | 2.0 W max |
| Operating Temperature | 0 °C to +60 °C |
| Storage Temperature | -40 °C to +85 °C |
| Relative Humidity | 5–95% non-condensing |
| Wiring Style | Removable terminal block (RTB) |
| Indicators | 16 × green LED (per-point status) |
| Certifications | UL, CSA, CE, C-Tick |
| Dimensions (H × W × D) | Standard 1746 single-slot form factor |
| Weight | Approx. 200 g |
Proven Application Environments
- Discrete Manufacturing: Conveyor line control, part-present detection via inductive proximity sensors, end-of-travel limit switch monitoring.
- Packaging Machinery: Film-break detection, registration mark sensing, door interlock monitoring.
- Material Handling: Pallet position sensing, AGV zone detection, sorter divert confirmation.
- Process Plants: Valve position feedback (open/closed), pump run/fault status, level switch inputs.
- Building Automation & Utilities: Motor starter auxiliary contact monitoring, flow switch inputs, pressure switch status.
- OEM Machine Retrofit: Drop-in replacement for aging 1746-IB16 revisions in existing SLC 500 chassis without re-engineering wiring or ladder logic.
Engineering Advantages
- High Noise Immunity: Optical isolation at 1500 VAC prevents ground loops and transient coupling from inductive field devices from corrupting backplane data.
- Fast Response: Sub-millisecond ON/OFF response time supports high-speed event capture without additional HSC modules for most applications.
- Wide Input Voltage Window (10–30 VDC): Tolerates supply sag and cable voltage drop in long-run field wiring without false OFF states.
- Per-Point LED Diagnostics: 16 individual green LEDs enable rapid field troubleshooting without a programming terminal — critical for minimizing MTTR.
- Removable Terminal Block: RTB wiring allows module swap without disturbing field wiring, reducing planned maintenance downtime.
- Revision /C Stability: Mature hardware revision with a stable supply chain and extensive field deployment history — minimizes obsolescence risk in long-lifecycle plant assets.
System Architecture & Signal Flow
Field devices (NPN sinking sensors, dry contacts) connect to the 1746-IB16/C terminal block. Each input channel passes through an RC filter and optical isolator before presenting a logic-level signal to the SLC 500 backplane. The SLC processor reads the 16-bit input image word each scan cycle. LED indicators reflect real-time input state directly from the field side of the isolator, providing hardware-level visibility independent of processor scan.
Compatible Chassis: 1746-A4, 1746-A7, 1746-A10, 1746-A13 (any SLC 500 modular chassis). Compatible with SLC 5/01, 5/02, 5/03, 5/04, and 5/05 processors.
Sourcing & Quality Verification
- All units sourced from verified industrial surplus channels and authorized distribution networks.
- Each module undergoes visual inspection: label integrity, connector condition, no physical damage or evidence of field abuse.
- Functional bench test available on request prior to shipment for critical applications.
- Original Rockwell Automation firmware and hardware — no counterfeit risk. Konmask does not sell clones or unauthorized reproductions.
- Traceability documentation (lot, revision, inspection record) available upon request for regulated industries.
Procurement Process
- Step 1 – Confirm Revision: Verify /C revision is compatible with your existing SLC 500 chassis and processor firmware. Contact our engineering team if uncertain.
- Step 2 – Place Order: Add to cart and complete checkout. Purchase orders accepted for qualified B2B accounts — contact support@konmask.com.
- Step 3 – Shipping: Orders processed within 1 business day. DHL / FedEx international express available. Export documentation (commercial invoice, packing list, COO) included.
- Step 4 – Incoming Inspection: Recommended: verify LED function and backplane communication on a bench chassis before installation in a live machine.
- Step 5 – Support: Post-sale technical support available via email and phone for integration questions.
Technical FAQ
Q: Is the 1746-IB16/C compatible with sourcing (PNP) sensors?
A: No. This module is a sinking (NPN) input type. For PNP/sourcing sensors, use the 1746-IB16X or 1746-IV16.
Q: Can I mix 1746-IB16/C with other revisions (e.g., /A, /B) in the same chassis?
A: Yes. All 1746-IB16 revisions are slot-compatible and logically identical to the SLC processor. Mixing revisions in a chassis is fully supported.
Q: What is the maximum cable length from field device to module terminal?
A: Rockwell recommends keeping field wiring under 30 m (100 ft) for standard installations. Longer runs are possible with shielded cable and attention to voltage drop within the 10–30 VDC input window.
Q: Does this module support high-speed counting?
A: No. Standard scan-based input only. For pulse counting or encoder feedback, use a dedicated HSC module (e.g., 1746-HSCE2).
Q: What is the lead time?
A: In-stock units ship within 1 business day. Contact us for volume orders or expedited requirements.
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