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Key Technical Specifications
| Parameter | Value |
|---|---|
| Catalog Number | 1794-ACN15 (also listed as 1794-ACN15/D) |
| Module Type | ControlNet Adapter for FLEX I/O |
| Communication Protocol | ControlNet V1.5 (5 Mbps) |
| Network Port | 1 × RG6 coax BNC connector |
| I/O Capacity | Up to 8 FLEX I/O modules (256 digital points or 64 analog inputs / 32 analog outputs) |
| Input Voltage | 19.2–31.2 V DC (nominal 24 V DC) |
| Input Current | 400 mA typical; 450 mA max |
| Flexbus Output | 5 V DC @ 640 mA max (powers FLEX I/O backplane) |
| Inrush Current | 23 A for 2 ms |
| Power Dissipation | 3.4 W @ 19.2 V DC (4.6 W max) |
| Isolation Voltage | 850 V DC (power to system, power to ControlNet, ControlNet to system) |
| Mounting | DIN rail or panel mount |
| Enclosure Rating | IP20 (open-style) |
| Operating Temperature | 0 to 55 °C (32 to 131 °F) |
| Storage Temperature | −40 to 85 °C (−40 to 185 °F) |
| Humidity | 5–95% non-condensing |
| Vibration | 5 g @ 10–500 Hz (IEC 68-2-6) |
| Shock | 30 g peak, 11 ms pulse |
| Dimensions (H × W × D) | ~87.4 × 94 × 92 mm (3.44 × 3.7 × 3.6 in) |
| Weight | ~220 g (7.76 oz) |
| Certifications | UL, CE, CSA; ATEX/IECEx (Ex nA IIC T4 Gc) |
Product Introduction
The Allen-Bradley 1794-ACN15 is a ControlNet communication adapter for 1794 FLEX I/O systems. It provides a single RG6 coax BNC port for ControlNet V1.5 at 5 Mbps and powers up to 8 FLEX I/O modules via a 5 V DC Flexbus output.
This adapter is chosen for integrating FLEX I/O into ControlNet-based control systems where deterministic, high-speed I/O scanning is required. In field deployments, it’s commonly used in oil & gas, power generation, water treatment, and metals processing where ControlNet remains the backbone network.
1794-ACN15
1794-ACN15
1794-ACN15
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No power LED on module | 24 V DC supply missing or wiring fault | ✅ High | Measure 19.2–31.2 V DC at input terminals; check polarity and fuse | Fix 24 V DC supply and wiring before swapping module |
| Network LED off or flashing red | ControlNet cable fault or termination issue | ✅ High | Check coax continuity; verify 75 Ω terminators at both ends | Replace damaged coax; ensure proper termination |
| I/O modules not powering | Flexbus 5 V DC output fault | ✅ High | Measure 5 V DC at Flexbus terminals; check load current | Reduce I/O module count; replace module if 5 V is out of spec |
| Intermittent ControlNet comms | Poor connections or EMI | ✅ Medium | Inspect BNC connectors; check cable routing near VFDs/motors | Re-terminate coax; improve shielding and grounding |
| Excessive heat from module | Overload or poor ventilation | ✅ Medium | Measure input current; check enclosure temperature | Improve airflow; verify input voltage within 19.2–31.2 V DC |
| Network faults after adding adapter | Too many nodes or config error | ❌ Medium | Verify ControlNet schedule and NUT; check node address | Adjust network config; verify node address uniqueness |
If you’re stuck, send photos of the module (including LEDs), a network diagram, and a list of connected I/O modules. We’ll review it before you swap the module.
Frequently Asked Questions (FAQ)
Q: Is the 1794-ACN15 hot-swappable?
A: No. The 1794-ACN15 must be installed and removed with 24 V DC power OFF. Hot-swapping can damage the backplane and connected I/O modules.
Q: What’s the difference between 1794-ACN15 and 1794-ACNR15?
A: is a single-port ControlNet adapter. ACNR15 is a redundant ControlNet adapter with two BNC ports for network redundancy. ACNR15 is used where network availability is critical.
Q: How many FLEX I/O modules can I connect to the 1794-?
A: Maximum 8 FLEX I/O modules. This equals 256 digital points or 64 analog inputs / 32 analog outputs, or a mix to meet project needs.
Q: Can I use the 1794- with EtherNet/IP?
A: No. The 1794- is ControlNet only. For EtherNet/IP, use the 1794-AENTR adapter.
Q: What condition are these modules in, and why is pricing lower than factory?
A: We sell New Original (New Surplus) and Refurbished (tested) units. Pricing is lower because these are surplus or professionally refurbished, and Rockwell has discontinued the 1794- as of Oct 31, 2026. Each refurbished unit goes through live functional testing and comes with a 1-year warranty.
Q: Do I need to configure the 1794- in RSLogix?
A: Yes. The 1794- must be configured in RSLogix 5000 or Studio 5000 as a ControlNet adapter. Set the node address, schedule, and I/O mapping in the controller configuration.
Q: What power supply do I need for the 1794-?
A: Use a 24 V DC, Class 2 / SELV power supply capable of at least 450 mA. For multiple adapters and I/O modules, size the supply for total current (450 mA × number of adapters plus I/O module load).
