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Product Overview
The 1746-IN16 is a 16-channel, 24 V AC/DC digital input module manufactured by Allen-Bradley, a brand of Rockwell Automation, and is a core member of the Bulletin 1746 SLC 500 family of modular I/O. Designed to translate the on/off state of real-world discrete field devices into logic-level data that an SLC 500 processor can act on, the 1746-IN16 accepts either 24 V DC or 24 V AC input voltage at each of its sixteen sinking/sourcing terminals, making it one of the most flexible general-purpose input cards in the SLC 500 catalog. Each channel is individually opto-isolated from the backplane and features a dedicated status LED, giving the module both electrical immunity to field-side noise and a visual indication at the terminal block that technicians can read from the cabinet door without a laptop or handheld monitor.Unlike modules limited to a single polarity or a single voltage family, the 1746-IN16 handles both AC and DC excitation on a per-point basis across its full 20.4–28.8 V operating window, so a single card can read a mix of DC proximity sensors, AC limit switches, and hardwired interlock contacts without external interposing relays or voltage-matching tricks. The module draws 75 mA from the 5 V DC backplane rail and dissipates approximately 3.9 W, figures that sit comfortably within the budget of even a modestly specified SLC 500 power supply. With an input on-state delay of 7 ms, an off-state delay of 7 ms, and a worst-case turn-on threshold of 15 V, the 1746-IN16 is deliberately conservative in its timing — fast enough for pump and valve sequencing, motor starter feedback, and conveyor interlocks, while remaining immune to the contact bounce and AC zero-crossing jitter that plague faster, less forgiving input designs. Housed in an open-type enclosure measuring just 30 mm wide and weighing 62 g, the 1746-IN16 installs in any standard SLC 500 chassis and carries cULus listing and CE marking, confirming its suitability for both North American and international panel designs.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 1746-IN16 |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Product Type | SLC 500 16-Channel 24 V AC/DC Digital Input Module |
| Number of Inputs | 16 (sinking/sourcing, individually isolated) |
| Input Voltage Range | 20.4–28.8 V AC or DC (24 V nominal) |
| Input Voltage Category | 24 V AC / 24 V DC, selectable per channel |
| Input ON Voltage | 15 V minimum (guaranteed on); 6 V typical at 2.5 mA |
| Input OFF Voltage | 3 V maximum (guaranteed off) |
| Input ON Current | 2.5 mA minimum at 15 V |
| Input OFF Current | 1.5 mA maximum at 3 V |
| Nominal Input Current | 11 mA per channel @ 24 V DC |
| ON State Delay | 7 ms (DC), 9/16 ms max (AC, 50/60 Hz) |
| OFF State Delay | 7 ms (DC), 21/17.5 ms max (AC, 50/60 Hz) |
| Input Impedance | 2.2 kΩ @ 24 V DC |
| Backplane Current (5 V DC) | 75 mA |
| Power Dissipation | 3.9 W |
| Terminal Type | 16-point removable screw terminal block |
| Indicators | 16 green input status LEDs + 1 green/red module status LED |
| Isolation | 500 V continuous between field side and backplane |
| Wire Size | 0.25–2.5 mm² (22–14 AWG) solid or stranded copper |
| Enclosure Type | Open type |
| Dimensions (W × H × D) | 30 × 140 × 114 mm (1.18 × 5.51 × 4.49 in) |
| Weight | 62 g (2.2 oz) |
| Operating Temperature | 0–60 °C (32–140 °F) |
| Storage Temperature | –40–85 °C (–40–185 °F) |
| Relative Humidity | 5–95% RH, non-condensing |
| Certifications | cULus listed, CE marked |
