Technical Specifications
Product Model | 1746-ITV16Manufacturer | Rockwell Automation / Allen-BradleyProduct Type | SLC 500 16-Point 24 V DC High-Speed Sinking Digital Input ModuleSeries | Allen-Bradley SLC 500 (1746 I/O)Number of Inputs | 16 (Sinking / Current Sinking, TTL-compatible)Input Voltage Range | 10–30 V DC (nominal 24 V DC)Operating Threshold (ON) | Typ. 10 V DC min / 30 V DC maxInput Current (per point @ 24 V DC) | approx. 8 mAON Delay (max) | 0.3 ms typical / 1.0 ms maxOFF Delay (max) | 0.5 ms typical / 1.0 ms maxCommon Configuration | 1 Common (all 16 inputs share same DC return)Backplane Current Draw (5 V) | 85 mA typicalPower Dissipation | 2.5 W maxRemovable Terminal Block | Uses 1746-RTBM (screw) or 1746-RTB (standard); 20-positionIndicators | 16 × individual input status LEDs + Module OK (MOD)Slot Requirement | Occupies 1 I/O slot in any 1746 SLC 500 chassis (Slots 2–6)Operating Temperature | 0 °C to +60 °CStorage Temperature | -40 °C to +85 °CAgency Approvals | UL Listed, cULus, CE Marked, C-TickFunctional Replacement Note | Faster response variant of 1746-IB16; not directly replaceable in applications requiring isolated commons
Main Features and Advantages
The defining advantage of the Allen-Bradley 1746-ITV16 is its high-speed response characteristic tailored for pulse and encoder applications. With input turn-on and turn-off delays an order of magnitude faster than the standard 1746-IB16 (which typically filters inputs at 8–10 ms), the Allen-Bradley 1746-ITV16 can reliably detect pulses as short as 1 ms and is frequently used to read A/B/Z quadrature encoder channels on lower-speed shafts or to count product pass-by events on high-speed packaging lines when a dedicated high-speed counter module is not justified.Ease of integration is another strong point. The Allen-Bradley 1746-ITV16 auto-registers in the SLC 500 I/O image upon installation—no DIP switches to set for addressing; the slot position in the chassis determines the input word address (I:x.0 through I:x.15). The single-common wiring scheme simplifies panel layout for applications where all field devices share a common 24 V DC supply return, though care must be taken to size the common wire adequately for the cumulative return current of all active inputs (up to 128 mA worst-case).Diagnostic visibility is built in: each of the 16 inputs has a dedicated green LED on the module face, and the MOD LED indicates backplane communication health. The Allen-Bradley 1746-ITV16 uses the standard 20-position removable terminal block (1746-RTBM preferred for finger-safe design), allowing the wiring to remain in the panel when the module is withdrawn for replacement—minimizing downtime during maintenance. Conformal-coated versions (where specified by suffix) extend suitability to humid or mildly corrosive environments. For legacy system keepers, the Allen-Bradley 1746-ITV16 offers a drop-in, well-documented solution that preserves the original control philosophy while delivering the speed needed for time-critical discrete inputs.
Application Field
The Allen-Bradley 1746-ITV16 is most commonly applied wherever the SLC 500 system must capture brief or rapidly occurring DC input events that fall outside the bandwidth of standard digital input modules. In packaging machinery—bottle fillers, carton erectors, label applicators—the Allen-Bradley 1746-ITV16 reads photocell pulses from product detection sensors operating at high line speeds, ensuring every item is counted and no false negatives occur due to input filtering lag. In web-handling and converting equipment, it may be used to accept A- or B-channel pulses from a rotary encoder for basic linear position tracking or repeat-length calculation within the SLC 500 ladder logic.The module also finds use in material handling systems such as sortation conveyors, where it monitors high-speed inductive proximity sensors detecting parcel gaps or divert-arm positions. In process skids with SLC 500 control, the Allen-Bradley 1746-ITV16 can accept dry-contact or solid-state pulse outputs from totalizing flow meters or batch counters. Because it is a sinking input, field wiring typically connects PNP (source) sensor outputs to the input terminals and returns the sinking current through the common to the 0 V / DC COM of the 24 V DC power supply.For machine builders and end-users maintaining SLC 500-based assets—particularly in food & beverage, pharma secondary packaging, automotive component lines, and warehouse automation—the Allen-Bradley 1746-ITV16 remains the go-to module when fast DC input capture is required within the familiar single-slot SLC 500 footprint.
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