Configured for AC discrete signal acquisition in FLEX I/O systems, the Allen Bradley 1794‑IA16 (1794‑IA16 digital input module) provides direct electrical processing of 16 nonisolated AC input points across approved terminal base assemblies.
Hardware Specifications
Parameter
Specification
Model
1794‑IA16
Brand
Allen Bradley
Origin
USA
Weight
Not specified
Dimensions
Not specified
Operating Temp
Not specified
Power Consumption
Max 6.4 W @ 132 VAC
Core Performance Indicators
16 AC inputs, nonisolated channels, 74–132 VAC on‑state range, 10 kΩ nominal impedance, 20 mA Flexbus current, basic insulation between field and system
Backplane Bus Communication Velocity & I/O Density Scaling
Within FLEX I/O architectures, the 1794‑IA16 participates in deterministic backplane bus communication velocity governed by the Flexbus interface. The module’s 20 mA backplane draw and nonisolated channel structure allow predictable I/O density scaling when combined with other FLEX modules. Slot‑to‑slot propagation maintains stable update timing for high‑channel‑count racks, ensuring consistent scan behavior under mixed AC and DC module configurations.
Frequently Asked Questions
Q: Can the 1794‑IA16 be installed on any FLEX terminal base A: It must be mounted on approved bases: 1794‑TB3, 1794‑TB3S, 1794‑TBN, 1794‑TB3K, 1794‑TB3SK, or 1794‑TBNK.
Q: Are individual channels isolated A: No. Channels are nonisolated; isolation exists only between field side and system.
Q: What is the maximum on‑state voltage A: 132 VAC, with nominal operation at 120 VAC.
Field Installation Guidelines
Maintain separation between AC input wiring and low‑level signal conductors. Verify leakage current of connected proximity switches meets the specified limits (Ileak < 2.5 mA, Ion ≥ 5 mA). Ensure terminal base screws are tightened according to base specifications. Avoid routing AC conductors near high‑frequency drives to reduce induced noise. Confirm environmental conditions meet vibration, shock, humidity, and contamination limits before commissioning.
