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Product Overview
The 1756-IC16 is a 16-point digital DC input module manufactured by Allen-Bradley, the flagship industrial automation brand of Rockwell Automation, and forms part of the discrete I/O family within the 1756 ControlLogix platform. Rated for a nominal 48V DC signal level with an operating voltage range of 30 to 60V DC, the 1756-IC16 captures on/off status from field devices such as limit switches, relay contacts, pressure switches, and auxiliary contacts that operate on 48V DC control schemes — a voltage class widely used in power generation, telecommunications, transportation, and battery-backed industrial systems.slac.stanford.edu+1
The module’s sixteen inputs are organized into two isolated groups of eight points each, allowing field wiring from two separate 48V DC power sources to be terminated on a single card without risk of cross-connection. Each input channel accepts a wide on-state current range of 2 mA minimum at 30V DC to 7 mA maximum at 60V DC, with an off-state voltage threshold of 10V and an off-state leakage current limited to 1.5 mA, giving engineers generous noise-margin headroom in electrically demanding installations.slac.stanford.edu
As a standard ControlLogix input module, the 1756-IC16 supports software-configurable Change of State (COS) triggering, programmable input filter times, and cyclic update intervals selectable from 200 µs to 750 ms. Every point change is time-stamped to ±200 µs against the chassis Coordinated System Time (CST), providing high-resolution event sequencing for troubleshooting, batch record keeping, and post-incident analysis.slac.stanford.edu+1
Occupying a single ControlLogix chassis slot and using the 20-pin removable terminal block housing family (1756-TBNH / 1756-TBSH), the 1756-IC16 integrates seamlessly with every ControlLogix processor from the 1756-L1 through the 1756-L8x family, and is equally suited to local, remote, and distributed I/O chassis configurations. The module’s reverse-polarity protection and 2546V DC dielectric isolation between field-side and backplane safeguard the processor and chassis electronics from miswiring and transient events.slac.stanford.edu
For maintenance teams operating ControlLogix systems across utilities, rail networks, oil and gas facilities, and DC-bus manufacturing plants, the 1756-IC16 remains a critical spare-part item — restoring failed 48V DC input channels in minutes and preserving the substantial investment embodied in a proven ControlLogix control platform.emacstores.com+1
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 1756-IC16 |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Product Type | 16-Point Digital DC Input Module |
| Series / Platform | 1756 ControlLogix |
| Number of Inputs | 16 (8 points/common, 2 isolated groups) |
| Voltage Category | 30–60V DC (nominal 48V DC) |
| On-State Voltage Range | 30–55V DC @ 60 °C; 30–60V DC @ 55 °C (linear derating) |
| On-State Current | 2 mA min @ 30V DC; 7 mA max @ 60V DC |
| Off-State Voltage (Max) | 10V DC |
| Off-State Current (Max) | 1.5 mA |
| Input Impedance (Max) | 8.57 kΩ @ 60V DC |
| Inrush Current (Max) | 250 mA |
| Input Delay OFF→ON | 1 ms max + programmable filter (0 / 1 / 2 ms) |
| Input Delay ON→OFF | 4 ms max + programmable filter (0 / 1 / 2 / 9 / 18 ms) |
| Time Stamp of Inputs | ±200 µs |
| Cyclic Update Time | 200 µs minimum to 750 ms maximum (user selectable) |
| Backplane Current | 100 mA @ 5.1V DC; 3 mA @ 24V DC |
| Total Backplane Power | 0.58 W |
| Power Dissipation (Max) | 5.2 W @ 60 °C (17.73 BTU/hr) |
| Isolation Voltage | 2546V DC tested for 1 s; 250V AC max continuous (group-to-group and user-to-system) |
| Reverse Polarity Protection | Yes |
| Module Keying | Electronic, software configurable |
| RTB Compatibility | 1756-TBNH / 1756-TBSH (20-pin, purchased separately) |
| Wire Size | 22–14 AWG stranded, 3/64 in. insulation max |
| Conductor Category | 1 |
| Slot Width | 1 ControlLogix slot |
| Operating Temperature | 0 °C to 60 °C (32 °F to 140 °F) |
| Storage Temperature | –40 °C to 85 °C (–40 °F to 185 °F) |
| Relative Humidity | 5% to 95% non-condensing |
| Vibration / Shock | 2 G @ 10–500 Hz vibration; 30 G operating / 50 G non-operating shock |
| ESD Immunity | 6 kV contact / 8 kV air discharges |
| Certifications | UL Listed, CSA (Class I Div 2 Groups A, B, C, D), CE, FM Approved, KC, EAC, RCM |
