Hazardous Area ControlNet Solution — Allen-Bradley 1797-ACNR15 | FLEX Ex I/O Series
Where This Product Is Used
The Allen-Bradley 1797-ACNR15 ControlNet Ex Adapter is purpose-built for process industries where explosive atmospheres demand intrinsically safe field I/O. Engineers deploy this adapter in:
- Oil & Gas upstream/midstream — wellhead control panels, compressor stations, and pipeline SCADA nodes operating in Zone 1 / Division 1 classified areas
- Chemical & Petrochemical plants — reactor monitoring, distillation column instrumentation, and solvent-handling areas requiring IEC Ex / ATEX-compliant I/O
- Pharmaceutical manufacturing — solvent-based synthesis areas where dust and vapor ignition risk mandates intrinsically safe barriers
- Offshore platforms — topside and subsea control rooms where ControlNet determinism is critical for safety-rated loops
- Mining & Minerals processing — underground coal and metalliferous mines requiring Ex ia/ib certified field devices
- Water & Wastewater — pump stations with methane accumulation risk in wet wells and enclosed vaults
Technical Specifications
| Part Number | 1797-ACNR15 |
| Series | FLEX Ex I/O |
| Network | ControlNet (Coax, RG-6) |
| Hazardous Area Rating | ATEX / IECEx Zone 1, Zone 2 (Ex ia IIC T4) |
| NEC Classification | Class I, Division 1 & 2, Groups A–D |
| Communication Rate | 5 Mbps (ControlNet standard) |
| Max I/O Modules per Bank | Up to 8 FLEX Ex I/O modules |
| Power Supply Voltage | 24 VDC (supplied via FLEX Ex power supply) |
| Operating Temperature | -20 °C to +60 °C |
| Enclosure Rating | IP20 (mount inside certified Ex enclosure) |
| Weight | 240 g |
| Manufacturer | Allen-Bradley / Rockwell Automation |
Why Engineers Specify This Model
- Deterministic ControlNet backbone — scheduled and unscheduled messaging ensures predictable scan times for safety-critical loops, unlike Ethernet/IP in high-noise environments
- Native FLEX Ex integration — the 1797-ACNR15 is the only ControlNet adapter designed specifically for the FLEX Ex I/O platform, eliminating gateway latency and protocol translation errors
- Dual-port redundancy ready — supports ControlNet media redundancy for continuous process operations where downtime is not acceptable
- Intrinsic safety at the adapter level — field wiring energy is limited at source, removing the need for external Zener barriers on every channel
- Seamless RSLogix 5000 / Studio 5000 integration — add-on profiles available; no custom EDS mapping required
- Long product lifecycle — Rockwell Automation FLEX Ex platform has extended support commitments for brownfield process plants
Complete System Bill of Materials
A typical FLEX Ex ControlNet node requires the following components alongside the 1797-ACNR15:
- 1797-PS1E — FLEX Ex Power Supply (24 VDC, Ex rated)
- 1797-TB3 — FLEX Ex Terminal Base (per I/O module)
- 1797-IE8 — FLEX Ex 8-Channel Analog Input Module (4–20 mA)
- 1797-OE8 — FLEX Ex 8-Channel Analog Output Module
- 1797-IB16 — FLEX Ex 16-Channel Digital Input Module
- 1786-RPA/B — ControlNet Repeater Adapter (for extended cable runs)
- 1786-RPCD — ControlNet Coax Cable (RG-6, per meter)
- 1756-CNB / 1756-CNBR — ControlLogix ControlNet Bridge Module (scanner side)
Compliance & Industry Standards
- ATEX Directive 2014/34/EU — II 2 G Ex ia IIC T4 Gb
- IECEx Scheme — IECEx certified for global hazardous area deployment
- NEC Article 500 — Class I, Division 1 & 2, Groups A, B, C, D
- IEC 61158 / IEC 61784 — ControlNet fieldbus standard
- IEC 60079-11 — Intrinsic safety “ia” protection concept
- UL Listed / cUL Listed
- RoHS compliant
Quality Assurance & Sourcing
Every 1797-ACNR15 unit shipped from Konmask.com undergoes the following verification process:
- Visual inspection against Rockwell Automation OEM packaging and label standards
- Firmware version verification where applicable
- Functional power-on test prior to dispatch
- Sourced from authorized distributors and verified surplus channels with full traceability documentation
- Shipped with anti-static packaging and humidity indicator cards
How to Source This Part
- Add to cart directly on this page for in-stock units
- Request a quote for volume orders (>5 units) — email support@konmask.com
- Expedited sourcing — if stock is depleted, our procurement team can locate and qualify units within 3–5 business days
- WhatsApp / WeChat — contact +0086 19859288691 for urgent same-day inquiries
Application-Specific FAQ
- Q: Can the 1797-ACNR15 be used with a ControlLogix L7x or L8x controller?
- A: Yes. Use a 1756-CNB or 1756-CNBR bridge module in the ControlLogix chassis. The 1797-ACNR15 appears as a scheduled ControlNet node and is fully configurable in Studio 5000 v21+.
- Q: What is the maximum cable distance between the adapter and the ControlNet scanner?
- A: Standard ControlNet coax (RG-6) supports up to 1,000 m per segment without repeaters. Use 1786-RPA/B repeaters to extend beyond this limit.
- Q: Is the 1797-ACNR15 suitable for SIL 2 safety loops?
- A: The FLEX Ex platform supports intrinsically safe field wiring; however, SIL 2 loop integrity requires a complete safety-rated architecture including SIL-rated sensors, barriers, and a TÜV-certified safety controller. Consult your functional safety engineer for full SIL assessment.
- Q: Can I mix 1797-ACNR15 with standard FLEX I/O (non-Ex) modules?
- A: No. The FLEX Ex platform uses dedicated Ex-rated terminal bases and modules. Standard 1794 FLEX I/O modules are not compatible with the 1797 FLEX Ex system.
- Q: What firmware version does the 1797-ACNR15 require?
- A: Firmware is factory-loaded. Verify compatibility with your ControlNet network using RSNetWorx for ControlNet before commissioning.
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