ControlNet Drive Communication Solution – Allen-Bradley 20-COMM-D | 20-COMM Series
The Allen-Bradley 20-COMM-D is a ControlNet communication adapter designed for PowerFlex AC drives. It plugs directly into the drive’s DPI (Drive Peripheral Interface) port, enabling seamless integration of variable frequency drives into ControlNet-based industrial control networks. Engineers specify this adapter when deterministic, high-speed drive control over ControlNet is required in demanding process and discrete manufacturing environments.
Where This Product Is Used
The 20-COMM-D is deployed wherever PowerFlex drives must communicate over a ControlNet network. Typical application environments include:
- Automotive Assembly Lines — Coordinating conveyor and robot drive speeds with deterministic ControlNet timing for synchronized production flow.
- Water & Wastewater Treatment Plants — Integrating pump and blower drives into SCADA-controlled ControlNet architectures for remote speed and status monitoring.
- Oil & Gas Processing Facilities — Connecting compressor and fan drives to DCS systems via ControlNet for real-time process control.
- Food & Beverage Production — Enabling precise speed control of mixer, conveyor, and packaging drives within hygienic, high-uptime ControlNet cells.
- Mining & Bulk Material Handling — Linking crusher, conveyor, and hoist drives to plant-wide ControlNet networks for centralized monitoring and fault management.
- HVAC & Building Automation — Integrating large air-handling unit drives into building management systems using ControlNet infrastructure.
Technical Specifications
- Part Number: 20-COMM-D
- Manufacturer: Allen-Bradley / Rockwell Automation
- Interface: DPI (Drive Peripheral Interface) — plug-in module
- Network Protocol: ControlNet (IEEE 802.3 coaxial, RG-6 cable)
- Compatible Drives: PowerFlex 70, PowerFlex 700, PowerFlex 700H, PowerFlex 700S, PowerFlex 400, PowerFlex 40, PowerFlex 4M (DPI-equipped models)
- Data Rate: 5 Mbps (ControlNet standard)
- Network Topology: Trunk-and-drop coaxial bus
- Max Nodes per Network: 99
- Power Supply: Powered via DPI port (no external power required)
- Operating Temperature: 0°C to 50°C (32°F to 122°F)
- Storage Temperature: -40°C to 85°C
- Relative Humidity: 5% to 95% non-condensing
- Enclosure Rating: Open-type (installed inside drive enclosure)
- Weight: Approx. 100 g
- SKU / Catalog Number: 20-COMM-D
Why Engineers Specify This Model
- Deterministic Communication: ControlNet’s scheduled messaging guarantees cycle-time-critical drive commands arrive on time — essential for synchronized multi-axis applications.
- Plug-and-Play DPI Integration: Installs directly into the drive’s DPI port without additional wiring harnesses, reducing installation time and potential failure points.
- Dual-Port Redundancy Support: ControlNet’s inherent media redundancy capability allows dual-cable configurations for fault-tolerant drive networks.
- Full Parameter Access: Provides complete read/write access to all drive parameters over the network, enabling remote commissioning and diagnostics via RSLogix 5000 / Studio 5000.
- Proven Rockwell Ecosystem Compatibility: Natively integrates with ControlLogix, CompactLogix, and SLC 500 controllers using standard Add-On Profiles (AOPs) and EDS files.
- Reduced Panel Footprint: Eliminates the need for separate gateway hardware between the drive and ControlNet network.
Complete System Bill of Materials
A typical ControlNet drive integration using the 20-COMM-D requires the following components:
- Allen-Bradley 20-COMM-D — ControlNet to DPI Adapter (this item)
- PowerFlex AC Drive (70 / 700 / 400 series with DPI port)
- ControlLogix or CompactLogix PLC with ControlNet Scanner Module (e.g., 1756-CNB or 1756-CNBR)
- ControlNet Coaxial Trunk Cable (RG-6, 75 Ω)
- ControlNet BNC Tap Connectors and Terminators
- RSNetWorx for ControlNet (network configuration software)
- Studio 5000 / RSLogix 5000 (PLC programming software)
- 20-COMM-D EDS File (available from Rockwell Automation Product Compatibility & Download Center)
Compliance & Industry Standards
- ControlNet International (CI) Conformance Tested
- CE Marking — Compliant with EU Low Voltage and EMC Directives
- UL Listed — UL 508C (Power Conversion Equipment)
- RoHS Compliant — Restriction of Hazardous Substances Directive
- ODVA Conformance — Open DeviceNet Vendors Association standards
- Suitable for use in installations governed by IEC 61800-3 (Adjustable Speed Electrical Power Drive Systems)
Quality Assurance & Sourcing
Konmask.com sources the 20-COMM-D through verified industrial automation distributors and authorized supply channels. Every unit undergoes the following before shipment:
- Visual inspection for physical damage, pin integrity, and label authenticity
- Verification of catalog number, date code, and country of manufacture markings
- Cross-reference against Rockwell Automation’s genuine product identifiers
- Anti-static packaging with humidity indicator cards for safe transit
We do not source from grey-market or unverified secondary channels. If you require a Certificate of Conformance (CoC) or test report, please contact us prior to ordering.
How to Source This Part
- Add to Cart — In-stock units ship within 1–3 business days from our warehouse.
- Request a Quote — For bulk orders (5+ units) or project-based procurement, email support@konmask.com for volume pricing.
- Lead Time for Out-of-Stock: Typically 2–4 weeks depending on manufacturer availability. Contact us to confirm current lead times.
- Export & Cross-Border Orders: We ship internationally. Contact us for customs documentation, HS code confirmation, and freight options.
- Phone / WhatsApp: +0086 19859288691 (Monday–Friday, 09:00–18:00 CST)
Application-Specific FAQ
Q: Is the 20-COMM-D compatible with PowerFlex 755 drives?
A: No. The PowerFlex 750 series uses the HIIM (Human Interface and Interconnect Module) port architecture, not DPI. For PowerFlex 755, use the 20-750-CNETC ControlNet option card instead.
Q: Can I use the 20-COMM-D on a ControlNet network with other device types (e.g., I/O modules)?
A: Yes. ControlNet supports mixed-device networks. The 20-COMM-D occupies one node address on the network and coexists with other ControlNet devices such as 1756-CNB scanner modules and 1794-ACN15 FLEX I/O adapters.
Q: Does this adapter support explicit messaging for parameter read/write?
A: Yes. The 20-COMM-D supports both scheduled (implicit) I/O messaging for real-time control and unscheduled (explicit) messaging for parameter access and diagnostics.
Q: What is the maximum cable distance on a ControlNet segment?
A: Maximum trunk length is 1,000 m (3,280 ft) at 5 Mbps with RG-6 coaxial cable. Drop cable length is limited to 1 m (3.3 ft) per tap.
Q: Do I need to configure the node address on the adapter itself?
A: Yes. The 20-COMM-D has a rotary switch for node address assignment (1–99). Set the address before powering up the drive. Address 0 is reserved and must not be used.
Q: Can Konmask.com provide technical support for commissioning?
A: We provide pre-sales technical guidance and documentation. For on-site commissioning support, we recommend engaging a Rockwell Automation Solution Provider or Recognized System Integrator (RSI).
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Contact: support@konmask.com | +0086 19859288691
