Product Overview
Downtime on a ControlLogix line rarely waits for a purchase order. The Allen-Bradley 1756-IV16 digital DC input module keeps 16 field signals feeding your processor, and it is built for the voltage swings common in oil, gas and heavy industrial cabinets. This module suits plants that measure cost in lost production hours, not in catalog pages.
Technical Specifications
| Specification | Value |
|---|---|
| Inputs | 16 |
| Input Voltage | 12-24 Volts DC |
| Operating Voltage Range | 10-30 Volts DC |
| Backplane Current at 5 Volts | 110 milliamps |
| Backplane Current at 24 Volts | 2 milliamps |
| Maximum Input Current, Off-State | 1.5 milliamps |
| Power Dissipation (Max) | 5.41 Watts at 60 degrees Celsius |
Why These Ratings Matter
A wide operating range of 10-30 Volts DC means the 1756-IV16 tolerates the supply sag and surge that field wiring produces over long cable runs. Fewer nuisance trips translate directly into fewer unplanned shutdowns, and that is where the real savings sit.
Backplane current draw stays modest at 110 milliamps on the 5 Volt rail and 2 milliamps on the 24 Volt rail. In a densely packed chassis this leaves headroom for additional modules, so you avoid adding another power supply just to expand I/O.
Off-state current of 1.5 milliamps keeps leakage low, which protects input readings from false triggers caused by induced noise on long runs. Cleaner signals mean less time spent chasing phantom faults during commissioning.
Where the 1756-IV16 Fits
On a gas compression skid, this module reads pressure switch and valve position contacts back to the ControlLogix processor. The 10-30 Volts DC range handles the voltage drop across long field runs without extra signal conditioning.
In a pipeline pump station, the 16 inputs let one module cover a full group of status contacts, reducing the number of cards you stock. Fewer spare part numbers on the shelf lowers inventory cost while keeping critical coverage.
For water treatment and process plants, the same module handles discrete device feedback where cabinet temperatures climb. Its 5.41 Watt maximum dissipation at 60 degrees Celsius keeps thermal load predictable inside sealed enclosures.
Integration Notes
The 1756-IV16 works with the ControlLogix 1756 chassis and uses an input data format only. It requires a removable terminal block housing before mounting, available as the 1756-TBNH or 1756-TBSH. Confirm your terminal block choice with your supplier when ordering.
Selection Checklist
Before you buy, verify the chassis slot, confirm the terminal block housing you already have on hand, and match the module to your field voltage. Oil AutoTech offers hands-on technical selection help and fast dispatch, worldwide, so your line is not waiting on a shelf search.
FAQs
Q: What voltage range does the 1756-IV16 accept?
A: The operating voltage range is 10-30 Volts DC, with a nominal input voltage of 24 Volts DC.
Q: How many inputs does this module provide?
A: It provides 16 inputs arranged in 2 groups of 8 points each.
Q: Which terminal block does it need?
A: It requires a removable terminal block housing, either the 1756-TBNH or the 1756-TBSH.
Q: What is the maximum off-state current?
A: The maximum off-state current is 1.5 milliamps.
Q: Is this module compatible with the ControlLogix chassis?
A: Yes, it is designed for the ControlLogix 1756 chassis and uses an input data format only.
