20-COMM-M Allen-Bradley

20-COMM-M Allen-Bradley Power Board

Brand：Allen-Bradley Model number：20-COMM-M

Country of origin: United States Product weight：0.55kg

HS code：8517623990

Product Details：

Product Dimensions：

The 20-COMM-M acts as a dedicated communication gateway that mounts directly into the architecture of compatible PowerFlex drives. It manages the translation of data between the drive's internal peripheral interface (DPI) protocol and the Modbus Plus network. This allows an external controller, such as a Modbus Plus compatible PLC or a supervisory control and data acquisition (SCADA) system, to control the drive, monitor its status, and configure its parameters. The module is engineered for internal mounting, drawing its operating power directly from the drive's host controller, which simplifies physical installation.

Product Parameters

Network Protocol: Modbus Plus
Compatibility: Designed for use with Allen-Bradley PowerFlex 7-Class AC drives, including PowerFlex 70, PowerFlex 700, PowerFlex 700H, PowerFlex 700S, and PowerFlex 7000 drives.
Data Transfer Rate: Operates at the standard Modbus Plus network speed of $1 \text{ Mbps}$ .
Connection Interface: Features a standard 9-pin D-sub (DB9) female connector for the Modbus Plus network drop cable.
Address Range: Supports network node addressing from $1$ to $64$ , configurable via hardware switches on the module or through software parameters.
Power Consumption: Draws $160 \text{ mA}$ at $5 \text{ VDC}$ supplied directly via the drive's DPI interface.
Environmental Ratings: Operating temperature ranges from $-10\text{°C}$ to $50\text{°C}$ ( $14\text{°F}$ to $122\text{°F}$ ), with a non-condensing relative humidity rating of $5\%$ to $95\%$ .
Status Indicators: Equipped with multiple LEDs providing real-time diagnostics for module status, network status, and drive communication activity.

Product Advantages

A major advantage of the 20-COMM-M is its Direct Integration Architecture. Because it installs internally, it eliminates the need for external mounting brackets, separate power supplies, or extra DIN rail space. The adapter offers High-Speed Deterministic Control, taking full advantage of the $1 \text{ Mbps}$ Modbus Plus network speed to ensure minimal latency when sending start, stop, or speed reference commands to the drive.

Furthermore, it enables Full Parameter Accessibility, meaning that every parameter within the PowerFlex drive can be read from or written to over the network. This capability allows for remote troubleshooting and dynamic configuration changes. The Comprehensive Diagnostics provided by both the hardware LEDs and network error counters drastically reduce the time required to isolate network faults from drive faults.

Important Considerations and Precautions

When setting up the 20-COMM-M, it is imperative to observe Electrostatic Discharge (ESD) Protection. The module contains highly sensitive components that can be permanently damaged by static electricity; always use a grounding wrist strap when handling the card during installation.

Before mounting or removing the adapter, you must ensure that All Power to the Host Drive is Disconnected, including any auxiliary control power, to prevent electrical arcing and logic board damage. Node Address Conflict is another critical point; ensure that the node address switches on the module are set uniquely before powering up the network, as duplicate addresses will disrupt communication across the entire token-ring segment.

Additionally, standard Modbus Plus cabling rules must be followed, including the proper use of Terminating Resistors at the physical ends of the network trunk to prevent signal reflection. Finally, remember that because this is a legacy network adapter, users should carefully review network loading limits when expanding older control systems.

Product Applications

The 20-COMM-M is widely applied in industrial plants that maintain existing Modbus Plus network infrastructures alongside PowerFlex drive assets.

Water and Wastewater Facilities: Linking PowerFlex drives controlling large high-lift pumps and aerators to a centralized Modbus Plus SCADA network.
Metals and Mining: Managing conveyor systems, crushers, and fan drives where coordinated speed regulation is required over an established plant network.
Oil, Gas, and Petrochemical: Interfacing variable speed drives on compressors and blending pumps with legacy distributed control networks.
Material Handling and Logistics: Controlling sorting lines and automated overhead crane traveling axes.
Automotive Plants: Integrating specialized fan and pump control subsystems into the broader facility management platform.

1794-OE8H/B Allen-Bradley

We have the same series of models in stock. If you don't find the model you need, please contact us and we will provide you with an official quotation！

Allen-Bradley 440G-TZS21UPRH

Allen-Bradley 700-HLS1U2

Allen-Bradley 1440-SDM02-01RA

Allen-Bradley 1492-IFM40F-3

Allen-Bradley 1746-A10

Allen-Bradley 1746-NI4

Allen-Bradley 1746-NI8

Allen-Bradley 1747-L541

Allen-Bradley 1747-L552

Allen-Bradley 1756-A4

Allen-Bradley 1756-A10

Allen-Bradley 1756-A13