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Brand: Allen-Bradley
Allen-Bradley 22-COMM-B BACnet MS/TP Adapter
Description
A BACnet MS/TP adapter that plugs into PowerFlex 40 and 400 drives
The Allen-Bradley 22-COMM-B is a PowerFlex Component Class DSI BACnet MS/TP adapter. It is an embedded communication option for the PowerFlex 4-class drives, meaning that it mounts inside the drive and links to the drive’s DSI port with a short internal interface cable, so a building automation system can control the drive and read its status.
Rockwell lists it next to the ControlNet, DeviceNet, EtherNet/IP, LonWorks and PROFIBUS DP versions of the same family, all of which need a communication adapter cover that is ordered separately. The adapter is mainly relevant for HVAC fan and pump drives such as the PowerFlex 40 and PowerFlex 400.
Technical specifications
| Parameter | Specification |
|---|---|
| Catalog number | 22-COMM-B |
| Type | PowerFlex Component Class DSI BACnet MS/TP adapter |
| Drive compatibility | PowerFlex 40 class and PowerFlex 400 class drives (per 22COMM-IN002) |
| Mounting | Inside the drive, on the special communication cover (22B-CCB / 22B-CCC for PowerFlex 40; 22C-CCC for PowerFlex 400 frame C) |
| Interface cable | 15.24 cm (6 in.) internal interface cable to the drive DSI port |
| Cover required | Yes, ordered separately; IP20 / NEMA Type 1 only |
| Grounding | Lower-left screw 0.9 N-m on frame C; cover fasteners on frame B |
| Related external kit | 22-XCOMM-DC-BASE external DSI communications kit |
| Companion options | 22-COMM-C, 22-COMM-D, 22-COMM-E, 22-COMM-L, 22-COMM-P |
| Documentation | 22COMM-IN002 installation; 22COMM-UM user manual |
Installing it correctly
The installation sheet 22COMM-IN002 describes the steps: remove power, wait for the drive to discharge, remove the drive cover, set any address, data rate or operating-mode switches, mount the adapter on the special cover, and connect the internal interface cable between the DSI port on the drive and the adapter. The adapter contains parts sensitive to electrostatic discharge, so handle it with the static precautions given.
For frame C drives the adapter screw grounds the adapter and is tightened to 0.9 N-m. On frame B drives the screw does not ground it; installing the special cover with both cover fasteners does. Skipping that step is a common cause of unstable communication.
After installation, set the node address and baud rate switches or parameters before applying power, because the drive reads them at start-up. A wrong address or mismatched baud rate is the most common reason a BACnet controller cannot see the drive, and a quick check with the building controller’s discovery tool will confirm that the drive is responding.
Planning a BACnet network
Because the adapter sits inside the drive, enclosure ratings matter: the adapter option is stated for IP20 / NEMA Type 1 drives only. For several drives at one location, Rockwell offers the 22-XCOMM-DC-BASE external communications kit, which supports up to five drives.
BACnet MS/TP is a master/slave token-passing protocol on RS-485 wiring, so cable choice, termination and node addresses must follow the building controller’s rules. Confirm the BACnet object list in the 22COMM-UM user manual and the drive firmware revision before ordering.
Related Allen-Bradley products: Allen-Bradley 1769-AENTR Compact I/O EtherNet/IP Adapter, Allen-Bradley 1794-AENT FLEX I/O EtherNet/IP Adapter, Allen-Bradley 1734-AENT POINT I/O EtherNet/IP Adapter, Allen-Bradley 5094-AENTR FLEX 5000 EtherNet/IP Adapter, Allen-Bradley 1794-AENTR FLEX I/O Dual-Port EtherNet/IP Adapter and Allen-Bradley 1734-AENTR POINT I/O Dual Port EtherNet/IP Adapter.
Ordering and documents
Order 22-COMM-B exactly as printed. The hosted document is the 22COMM-IN002 installation instructions, and the photo is the official Rockwell product photograph of this part. Related communication parts are listed in the Industrial Communications category.
Seven Star LLC is an independent supplier in Muscat and quotes on request. Please confirm the catalog number, ratings and the current product status against the latest Rockwell Automation documents before ordering.
Datasheets & Documents
- Installation instructions PowerFlex 4-Class DSI Network Communication Adapter Installation Instructions (22COMM-IN002) Download
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About brand
Allen-Bradley is the brand of Rockwell Automation for industrial control: ControlLogix and CompactLogix controllers, I/O systems, PanelView operator terminals, PowerFlex drives, motor control and industrial network equipment. The company began in Milwaukee in 1903, when Lynde Bradley and Dr. Stanton Allen formed the Compression Rheostat Company to make the motor speed controller Bradley had invented in 1901. It took the name Allen-Bradley in 1909 and was bought by Rockwell International in 1985. Since 2001 its owner has been Rockwell Automation, which is still headquartered in Milwaukee, Wisconsin.
Allen-Bradley company profile
| Founded | 1903, Milwaukee, Wisconsin, USA, as the Compression Rheostat Company |
|---|---|
| Founders | Lynde Bradley (inventor of the compression rheostat, 1901) and Dr. Stanton Allen (investor); Harry Bradley joined in 1904 |
| Name | Allen-Bradley Company from 1909 |
| Ownership | Acquired by Rockwell International in 1985 for about USD 1.65 billion; a brand of Rockwell Automation (NYSE: ROK) since 2001 |
| Headquarters | Milwaukee, Wisconsin, USA |
| Product families | Logix programmable automation controllers (ControlLogix, CompactLogix), legacy SLC 500 and MicroLogix PLCs, Micro800 controllers, POINT, FLEX and Compact I/O, PanelView HMIs, PowerFlex AC drives, contactors, motor starters and soft starters, safety components, Stratix Ethernet switches |
Milestones
- 1901: Lynde Bradley invents the compression rheostat to control the speed of electric motors.
- 1903: The Compression Rheostat Company is formed in Milwaukee with an initial investment of USD 1,000.
- 1904: Harry Bradley joins; a crane controller is shown at the St. Louis World's Fair.
- 1909: The company is renamed Allen-Bradley.
- 1985: Rockwell International acquires Allen-Bradley.
- 2001: Rockwell Automation becomes the company's name; the Allen-Bradley brand marks 100 years in 2003.
Reading Allen-Bradley catalogue numbers
The first digits of an Allen-Bradley catalogue number identify the platform, which tells you what is compatible with what. 1756 is ControlLogix (chassis-based, used for large process and plant control), 1769 is CompactLogix 5370 with Compact I/O, 5069 is CompactLogix 5380 with Compact 5000 I/O, 1734 is POINT I/O, 1794 and 5094 are FLEX and FLEX 5000 distributed I/O, 1746 and 1747 belong to the older SLC 500 family, 1766 is MicroLogix 1400 and 2080 is Micro800. For drives, 25B is PowerFlex 525 and 22B is PowerFlex 40; in a code such as 25B-D010N114, "D" means 380–480 V, "010" is the output current rating, and N114 instead of N104 means the drive has an integrated EMC filter. Many plants in the region still run SLC 500 and older MicroLogix systems, which Rockwell has discontinued, so exact spares and migration to CompactLogix are both common requests.
Where Allen-Bradley products are used
In Oman and the GCC, Allen-Bradley controllers and drives run on oil and gas facilities, water treatment and pumping stations, cement, food and beverage and packaging plants, and on machines supplied by American OEMs. ControlLogix is often the platform for plant control systems, while PowerFlex drives are used on pumps, fans and conveyors.
Allen-Bradley products we list
| Family | Examples |
|---|---|
| ControlLogix | 1756-L85E, 1756-EN2T, 1756-EN2TR, 1756-IF16, 1756-IB32, 1756-PA75, 1756-A10 |
| CompactLogix and Micro controllers | 5069-L320ER, 5069-L340ERM, 1769-L33ER, 1769-L16ER, MicroLogix 1400, Micro820, SLC 500 (1746) |
| Distributed I/O | 1734-AENTR, 1734-IB8, 1734-IE2C, 1734-IB8S safety, 1794-AENTR, 5094-AENTR, 5069-IF8 |
| Operator terminals | PanelView Plus 7 10-inch, PanelView Plus 7 15-inch, PanelView 800, PanelView 5310 |
| Drives, motor control and networking | PowerFlex 525, PowerFlex 755, PowerFlex 4, 150-A180NBD SMC, Stratix 2000, 1783-NATR |
Ordering Allen-Bradley products: what we need
Send the full catalogue number and the series letter from the label (for example 1756-EN2T Series D), because firmware and compatibility can change between series. For drives, add the motor power, voltage and filter option. For a discontinued SLC 500 or MicroLogix part, tell us whether you need the exact spare or a migration proposal.
Facts checked against Rockwell Automation's published company history, October 2026.
Browse Allen-Bradley products by category: PLC & I/O Cards, AC Drives.
FAQ
Questions about the Allen-Bradley 22-COMM-B BACnet MS/TP Adapter
Answers from our engineering team on installation, compatibility and integration.
01What does 22-COMM-B do?
It lets a PowerFlex 4-class drive communicate over BACnet MS/TP.
02Which drives accept it?
PowerFlex 40-class and PowerFlex 400-class drives per the installation instructions.
03Is a cover needed?
Yes, a special communication adapter cover is ordered separately.
04How long is the internal cable?
15.24 cm (6 in.).
05Is there a similar option for EtherNet/IP?
Yes, 22-COMM-E, in the same family.
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