Allen-Bradley 1203-CN1 — ControlNet to SCANport Communication Adapter | 1203 Series
Engineering Background: The Allen-Bradley 1203 Series communication adapters are purpose-built interface modules within Rockwell Automation’s PowerFlex and legacy drive ecosystem. ControlNet, as a deterministic, repeatable network protocol, occupies a critical tier in the IEC 61158-compliant industrial network hierarchy — sitting between the controller backplane (DeviceNet/EtherNet/IP) and field-level I/O. The 1203-CN1 specifically bridges ControlNet’s scheduled and unscheduled messaging capabilities to the SCANport interface, enabling real-time parameter control and status monitoring of SCANport-equipped drives (e.g., PowerFlex 70, 700, 1336 PLUS II) directly from a ControlLogix or PLC-5 controller.
Product Positioning: The 1203-CN1 is distinguished from the 1203-GU6 (USB gateway) and 1203-SSS (SCANport splitter) by its native ControlNet node participation — it holds a ControlNet node address and participates in scheduled I/O transfers, making it the correct choice for deterministic torque/speed control loops. It is not a passive tap; it is an active network node. Boundary condition: this adapter is not suitable for EtherNet/IP-only architectures — for those, the 20-COMM-E or 1203-EN1 is the appropriate selection.
Complete Technical Specifications
Electrical
- Interface: SCANport (RJ-45, 8-pin modular)
- Network: ControlNet (BNC coaxial, dual-port redundant media)
- ControlNet Node Address Range: 1–99 (configurable via rotary switches)
- I/O Data Rate: Up to 500 kbps (ControlNet scheduled bandwidth)
- Power Supply: Derived from SCANport port (no external power required)
- Power Consumption: ≤ 200 mA @ 5 VDC (from host drive)
- Isolation: Optical isolation between ControlNet and SCANport interfaces
Mechanical
- Form Factor: DIN-rail mountable module, plug-in to SCANport
- Dimensions: Approx. 70 mm × 55 mm × 35 mm (H × W × D)
- Weight: ~300 g (with cable)
- Connector: SCANport RJ-45 (host side); BNC coaxial ×2 (ControlNet side)
- Cable: SCANport cable (1203-SFC series) required — not included
Environmental
- Operating Temperature: 0°C to +60°C
- Storage Temperature: −40°C to +85°C
- Relative Humidity: 5%–95% non-condensing
- Pollution Degree: 2 (IEC 60664-1)
- Enclosure Rating: IP20 (open-type, requires installation in rated enclosure)
- Vibration: 2 g, 10–500 Hz (IEC 60068-2-6)
- Shock: 30 g, 11 ms (IEC 60068-2-27)
Certifications
- UL Listed: UL 508C (Industrial Control Equipment)
- CE Marked: EMC Directive 2014/30/EU; Low Voltage Directive 2014/35/EU
- ControlNet International (CI) Conformance Tested
- RoHS Compliant
Data source: Rockwell Automation Publication 1203-IN006 (1203-CN1 Installation Instructions) and ControlNet Adapter User Manual 1203-UM001.
Proven Application Environments
- Petrochemical Refining: Crude distillation column pump drives (PowerFlex 700) | ControlNet-scheduled speed reference from ControlLogix L6x | Continuous 24/7 operation with deterministic loop closure <10 ms
- Electric Power Generation: Boiler feed pump variable-speed drives | PLC-5/40C ControlNet master | Coordinated ramp control during load-following transients
- Municipal Water Treatment: High-service pump station VFDs (1336 PLUS II) | ControlNet I/O scheduled at 5 ms RPI | Remote start/stop and fault monitoring from SCADA
- Automotive Assembly: Conveyor drive systems on body-in-white lines | ControlLogix with ControlNet I/O | Synchronized multi-axis speed matching across 20+ drive nodes
- Cement & Mining: Ball mill and crusher drive control | Harsh environment (high dust, vibration) | Adapter installed in NEMA 12 enclosure, SCANport cable routed separately
- Pulp & Paper: Winder section drive coordination | ControlNet redundant media (dual BNC) | Fault-tolerant operation during media break events
Engineering Advantages
- For deterministic torque control loops, this communication adapter participates as a full ControlNet node with scheduled I/O, because it holds a node address and transmits at a fixed RPI — eliminating jitter that would occur with unscheduled messaging.
- For redundant media architectures, this communication adapter supports dual BNC coaxial connections, because ControlNet’s inherent media redundancy allows the network to continue operating on the secondary cable if the primary is severed.
- For legacy drive retrofit projects, this communication adapter preserves the SCANport interface of 1336 PLUS II and PowerFlex 70/700 drives, because replacing the drive to gain network connectivity is cost-prohibitive compared to adding a $200–400 adapter module.
- For multi-drive coordinated systems, this communication adapter allows up to 99 nodes per ControlNet segment, because the protocol supports both scheduled (I/O) and unscheduled (explicit messaging) traffic on the same physical medium.
- For panel space-constrained installations, this communication adapter requires no external power supply, because it draws operating power directly from the SCANport port of the host drive — eliminating an additional 24 VDC power feed.
- For high-vibration environments (mining, cement), this communication adapter maintains signal integrity, because the BNC coaxial connectors provide a positive locking mechanism superior to RJ-45 in high-vibration conditions.
System Architecture & Signal Flow
Signal Flow: ControlLogix Controller → ControlNet Scanner (1756-CNB/R) → ControlNet Coaxial Trunk → 1203-CN1 (ControlNet Node) → SCANport Cable (1203-SFC) → Drive SCANport Port → Drive Internal Parameter Bus → Motor Output Stage
Compatible Controllers & Scanners:
- 1756-CNB / 1756-CNBR (ControlLogix ControlNet Bridge) — primary pairing; supports RSNetWorx for ControlNet scheduling
- 1771-ACN15 / 1771-ACNR15 (PLC-5 ControlNet Adapter) — legacy system integration
- 1747-SCNR (SLC 500 ControlNet Scanner) — for SLC-based architectures
Compatible Host Drives (SCANport): PowerFlex 70 (20A), PowerFlex 700 (20B), 1336 PLUS II, 1336 IMPACT, 1336 FORCE, 1305, 1336 REGEN
Substitution Conditions: The 1203-EN1 is the direct functional replacement for EtherNet/IP networks. The 20-COMM-C (ControlNet) is the equivalent adapter for PowerFlex 4/40/400/70/700 drives with the 20-HIM-A6 port — note the different physical interface (20-COMM vs SCANport). Substitution requires verification of drive firmware version and RSNetWorx configuration export.
Sourcing & Quality Verification
Units are sourced from decommissioned industrial control panels, authorized distributor overstock, and factory-sealed surplus channels. Each unit undergoes a structured incoming inspection before listing.
4-Step Inspection Process:
- Visual Inspection: Housing integrity check, BNC connector pin condition, SCANport RJ-45 contact inspection, label legibility and catalog number verification against Rockwell Automation part numbering schema
- Functional Power-On Test: Unit powered via SCANport simulator; LED status verification (NET, STS, MOD indicators) per 1203-IN006 diagnostic table
- Node Address Switch Test: Rotary switch continuity and address encoding verified across full 1–99 range
- Communication Loopback Test: ControlNet node response verified using RSNetWorx for ControlNet browse function on isolated test segment
Documentation Available Upon Request:
- Rockwell Automation 1203-IN006 Installation Instructions (original or PDF)
- Test report with unit serial number and inspection date
- Photos of actual unit (all four sides) prior to shipment
- Certificate of conformance (for orders ≥ 5 units)
Procurement Process
- Submit Inquiry: Contact via the form below or email support@konmask.com with your required quantity, delivery timeline, and destination country. Include your existing drive model and ControlNet scanner catalog number for compatibility pre-check.
- Receive Quote & Availability Confirmation: A detailed quotation including unit price, shipping options (DHL/FedEx/UPS), lead time, and payment terms will be issued within 24 hours of inquiry receipt.
- Order Confirmation & Shipment: Upon payment confirmation, units are inspected, photographed, and shipped with tracking. Export documentation (commercial invoice, packing list, COO) provided for international shipments.
Technical Support: Pre-sales engineering support is available for system compatibility verification, RSNetWorx configuration guidance, and SCANport cable selection. Post-sales support covers installation troubleshooting and LED diagnostic interpretation. Response within 24 hours on business days (UTC+8).
Technical FAQ
Q1: Is the 1203-CN1 compatible with PowerFlex 755 drives?
No. The PowerFlex 755 uses the 20-COMM port architecture (not SCANport). The correct ControlNet adapter for PowerFlex 755 is the 20-COMM-C. The 1203-CN1 is exclusively for drives with a physical SCANport (RJ-45, 8-pin) interface.
Q2: Can the 1203-CN1 replace a 1203-GU6 in an existing installation?
Not directly. The 1203-GU6 is a USB-to-SCANport gateway used for parameter programming via DriveExplorer/DriveExecutive software — it does not participate in the ControlNet I/O scan. The 1203-CN1 is a network I/O adapter for real-time control. These serve different functions and are not interchangeable. Both can be installed simultaneously on a drive using a 1203-SSS SCANport splitter.
Q3: Does the 1203-CN1 carry CE marking, and is it suitable for use in ATEX Zone 2 classified areas?
The 1203-CN1 carries CE marking per EMC Directive 2014/30/EU and LVD 2014/35/EU. It does not carry ATEX or IECEx certification and must not be installed directly in Zone 1 or Zone 2 hazardous areas. For hazardous area installations, the adapter must be housed in a certified Ex e or Ex d enclosure with appropriate cable gland sealing, and the installation must be assessed by a qualified Ex engineer per IEC 60079-14.
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