Easy BACnet- Home
- BACnet points lists
- Rockwell Automation (Allen-Bradley)
- 20-COMM-B BACnet MS/TP adapter for PowerFlex 70 / 700 / 700VC / 700H
Variable frequency drive (BACnet MS/TP adapter) · BACnet points list
Rockwell Automation (Allen-Bradley) 20-COMM-B BACnet MS/TP adapter for PowerFlex 70 / 700 / 700VC / 700H BACnet points list
Updated 12 November 2026Unofficial source
The 20-COMM-B is the BACnet MS/TP communication adapter for PowerFlex 7-Class drives. It exposes a fixed object set: drive I/O terminals as AI, AO, BI and BO objects; references, measurements, fault history, ramp times and a parameter mailbox as Analog Values; and drive status and commands as Binary Values. A few output objects are only supported on some drives, noted in the descriptions.
This page lists 45 BACnet objects for the Rockwell Automation (Allen-Bradley) 20-COMM-B BACnet MS/TP adapter for PowerFlex 70 / 700 / 700VC / 700H — 17 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from a copy of Rockwell Automation (Allen-Bradley)’s documentation hosted by reseller CDN (cloudfront), not by Rockwell Automation (Allen-Bradley) itself, so treat it as unofficial.
- Manufacturer
- Rockwell Automation (Allen-Bradley)
- Model
- 20-COMM-B BACnet MS/TP adapter for PowerFlex 70 / 700 / 700VC / 700H
- Equipment
- Variable frequency drive (BACnet MS/TP adapter)
- Equipment type
- VFDs & pumps
- BACnet objects
- 45 (17 writable)
- Transport
- BACnet MS/TP
- Firmware
- FRN 1.xxx
- Default device instance
- 160000
- Also known as
- 20-COMM-B, PowerFlex 70 BACnet, PowerFlex 700 BACnet, PowerFlex 700VC BACnet, PowerFlex 700H BACnet, 20COMM-UM013
- Source document
- BACnet MS/TP Adapter 20-COMM-B FRN 1.xxx User Manual · 20COMM-UM013C-EN-P · rev. 2006-10 (unofficial copy, hosted by reseller CDN (cloudfront))
Reference only, provided as-is: verify against Rockwell Automation (Allen-Bradley)’s current documentation and the live device before use. Not official Rockwell Automation (Allen-Bradley) information. Terms of use.
BMS integration notes: Rockwell Automation (Allen-Bradley) 20-COMM-B BACnet MS/TP adapter for PowerFlex 70 / 700 / 700VC / 700H
Set drive parameter 90 [Speed Ref A Sel] to 22 (DPI Port 5) so the network reference works, write a % speed reference to AV 0 and start/stop with BV 10. Read BV 1, AV 2, AV 3, BV 3 and the fault codes for monitoring; BV 13 clears faults.
Minimum points to map
The short list most integrators start with — enough to run the unit from a BMS. Map more as the job needs.
| Object | Name | Why | Access |
|---|---|---|---|
| BV 10 | Run/Stop | Run/stop command (1 = run) | Write |
| AV 0 | Reference 1 (%) | Speed reference, % | Write |
| BV 13 | Clear Faults | Fault reset (write 1) | Write |
| BV 1 | Running | Running status | Read |
| AV 2 | Output Frequency (Hz) | Output frequency, Hz | Read |
| AV 3 | Output Current (Amps) | Output current, A | Read |
| BV 3 | Fault | Drive fault | Read |
| AV 12 | Fault 1 | Latest fault code | Read |
Enable & remote start
Drive parameter 90 [Speed Ref A Sel] = 22 (DPI Port 5) makes the drive follow the network reference; BV 10 then starts and stops it.
Heartbeat & communication loss
Adapter parameter 03 [Comm Loss Time] (default 10 s, 0-180 s, 0 = off) sets when a network loss is detected; parameter 02 [Comm Loss Action] decides the response (default fault; also stop, zero data, hold last or send fault configuration from parameters 04/05).
Network setup
- MAC address is set in binary on DIP switches SW1-SW7 before power-up; reset or power-cycle the adapter after changing it.
- Device instance default 160000, set with adapter parameter 11 [Device Instance]; reset the adapter to apply.
- Baud rate is adapter parameter 06 [Baud Rate Cfg]: Autobaud (default), 9600, 19200, 38400 or 76800; reset after a change.
Watch out for
- Commands written over BACnet are volatile; after an adapter reset or power cycle the BMS must write them again.
- AO 1, BI 12 and BO 2 exist only on PowerFlex 700VC and 700H; AO 0, BO 0 and BO 1 are not supported on PowerFlex 70 Standard and 700 Standard.
Rockwell Automation (Allen-Bradley) 20-COMM-B BACnet MS/TP adapter for PowerFlex 70 / 700 / 700VC / 700H BACnet objects
Type: AI, AO, AV, BI, BO, BV, MI/MO/MV (multi-state) · Access: Read read-only, Write writable, Command writable with a priority array.
| Description | States | |||||
|---|---|---|---|---|---|---|
| AI | 0 | Analog Input 1 (%) | Drive analog input 1 (voltage or current) | % | Read | |
| AI | 1 | Analog Input 2 (%) | Drive analog input 2 (voltage or current) | % | Read | |
| AO | 0 | Analog Output 1 (%) | Drive analog output 1; needs P342 = 24 (not PF70 Std / PF700 Std) | % | Write | |
| AO | 1 | Analog Output 2 (%) | Drive analog output 2; needs P345 = 24 (PF700VC / 700H only) | % | Write | |
| AVmin | 0 | Reference 1 (%) | Speed reference 1 | % | Write | |
| AV | 1 | Reference 2 (%) | Speed reference 2 (selected by BV 12) | % | Write | |
| AVmin | 2 | Output Frequency (Hz) | Drive output frequency | Hz | Read | |
| AVmin | 3 | Output Current (Amps) | Drive output current | A | Read | |
| AV | 4 | Output Voltage (VAC) | Drive output voltage | V | Read | |
| AV | 5 | Output Power (kW) | Drive output power | kW | Read | |
| AV | 6 | Output Energy (kWh) | Accumulated output energy; write 0 to reset | kWh | Write | |
| AV | 7 | DC Bus Voltage (VDC) | DC bus voltage | V | Read | |
| AV | 8 | Drive Temp (°C) | Drive temperature | °C | Read | |
| AV | 9 | PID Feedback (%) | PID feedback | % | Read | |
| AV | 10 | PID Error (%) | PID error | % | Read | |
| AV | 11 | Run Time (Hours) | Accumulated run time; write 0 to reset | h | Write | |
| AVmin | 12 | Fault 1 | Most recent fault code | Read | ||
| AV | 13 | Fault 2 | Second most recent fault code | Read | ||
| AV | 14 | Fault 3 | Third most recent fault code | Read | ||
| AV | 15 | Accel Time 1 (Sec) | Acceleration time 1 | s | Write | |
| AV | 16 | Decel Time 1 (Sec) | Deceleration time 1 | s | Write | |
| AV | 17 | Mailbox Param | Parameter number for mailbox read/write | Write | ||
| AV | 18 | Mailbox Value | Value of the mailbox parameter | Write | ||
| BI | 0 | Digital Input 1 | Drive digital input 1 | Read | ||
| BI | 1 | Digital Input 2 | Drive digital input 2 | Read | ||
| BI | 2 | Digital Input 3 | Drive digital input 3 | Read | ||
| BI | 3 | Digital Input 4 | Drive digital input 4 | Read | ||
| BI | 4 | Digital Input 5 | Drive digital input 5 | Read | ||
| BI | 5 | Digital Input 6 | Drive digital input 6 | Read | ||
| BI | 10 | Digital Output Act 1 | Drive digital output 1 state | Read | ||
| BI | 11 | Digital Output Act 2 | Drive digital output 2 state | Read | ||
| BI | 12 | Digital Output Act 3 | Drive digital output 3 state (PF700VC / 700H only) | Read | ||
| BO | 0 | Digital Output Cmd 1 | Drive digital output 1; needs P380 = 30 (not PF70 Std / PF700 Std) | Write | ||
| BO | 1 | Digital Output Cmd 2 | Drive digital output 2; needs P384 = 30 (not PF70 Std / PF700 Std) | Write | ||
| BO | 2 | Digital Output Cmd 3 | Drive digital output 3; needs P388 = 30 (PF700VC / 700H only) | Write | ||
| BV | 0 | Ready | Drive ready for a run command | Read | ||
| BVmin | 1 | Running | Drive running | Read | ||
| BV | 2 | Running Reverse | Drive running in reverse | Read | ||
| BVmin | 3 | Fault | Drive faulted | Read | ||
| BV | 4 | Alarm | Drive alarm active | Read | ||
| BV | 5 | At Reference | Drive at speed reference | Read | ||
| BVmin | 10 | Run/Stop | Run/stop command (1 = run) | Write | ||
| BV | 11 | Rev/Fwd | Direction command (1 = reverse) | Write | ||
| BV | 12 | Ref2/Ref1 | Reference select (1 = Reference 2) | Write | ||
| BVmin | 13 | Clear Faults | Fault reset (write 1) | Write |
No points match these filters.
Object ID lookup: Rockwell Automation (Allen-Bradley) 20-COMM-B PowerFlex 70/700 point IDs by name
AI0Analog Input 1 (%)AI1Analog Input 2 (%)AO0Analog Output 1 (%)AO1Analog Output 2 (%)AV0Reference 1 (%)AV1Reference 2 (%)AV2Output Frequency (Hz)AV3Output Current (Amps)AV4Output Voltage (VAC)AV5Output Power (kW)AV6Output Energy (kWh)AV7DC Bus Voltage (VDC)AV8Drive Temp (°C)AV9PID Feedback (%)AV10PID Error (%)AV11Run Time (Hours)AV12Fault 1AV13Fault 2AV14Fault 3AV15Accel Time 1 (Sec)AV16Decel Time 1 (Sec)AV17Mailbox ParamAV18Mailbox ValueBI0Digital Input 1BI1Digital Input 2BI2Digital Input 3BI3Digital Input 4BI4Digital Input 5BI5Digital Input 6BI10Digital Output Act 1BI11Digital Output Act 2BI12Digital Output Act 3BO0Digital Output Cmd 1BO1Digital Output Cmd 2BO2Digital Output Cmd 3BV0ReadyBV1RunningBV2Running ReverseBV3FaultBV4AlarmBV5At ReferenceBV10Run/StopBV11Rev/FwdBV12Ref2/Ref1BV13Clear Faults
Integration notes
- Table 4.A marks each object for PowerFlex 70 Standard, 70 Enhanced Control, 700 Standard, 700 Vector Control and 700H; unsupported objects are noted in the descriptions.
- AO and BO objects only drive the terminals when the drive output select parameter is set to Param Cntl (value given in the description).
- AV 6 and AV 11 accept only 0 (reset) when written.
- Object instance gaps (BI 6-9, BV 6-9) are not used.
- Source copy is hosted on a reseller CDN; the manual is Rockwell publication 20COMM-UM013C-EN-P.
Check it against the live device. A points list tells you what the controller can expose; the unit in front of you may differ by firmware or installed options. This list is provided as-is for reference only and may contain mistakes — confirming it before you write, map or commission anything is up to you (terms). Easy BACnet scans a network for BACnet IP devices from an Android phone, reads every object on the 20-COMM-B BACnet MS/TP adapter for PowerFlex 70 / 700 / 700VC / 700H and exports what it actually has to Excel — free. New to BACnet? Start with what a BACnet points list is and what the object types mean.
Questions about the Rockwell Automation (Allen-Bradley) 20-COMM-B BACnet MS/TP adapter for PowerFlex 70 / 700 / 700VC / 700H
How many BACnet points does the Rockwell Automation (Allen-Bradley) 20-COMM-B BACnet MS/TP adapter for PowerFlex 70 / 700 / 700VC / 700H have?
This list has 45 BACnet objects: 2 analog inputs, 2 analog outputs, 19 analog values, 9 binary inputs, 3 binary outputs, 10 binary values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Rockwell Automation (Allen-Bradley) 20-COMM-B BACnet MS/TP adapter for PowerFlex 70 / 700 / 700VC / 700H BACnet points are writable?
17 of the 45 objects accept a write. Points marked Command have a priority array: a write holds until it is released, so release it back to automatic when you are done.
Where is the official Rockwell Automation (Allen-Bradley) 20-COMM-B BACnet MS/TP adapter for PowerFlex 70 / 700 / 700VC / 700H BACnet documentation?
Rockwell Automation (Allen-Bradley) does not publish it on its own website. This list comes from BACnet MS/TP Adapter 20-COMM-B FRN 1.xxx User Manual (20COMM-UM013C-EN-P), revision 2006-10, a copy hosted by reseller CDN (cloudfront) at https://d14aeh40s5zf9b.cloudfront.net/userfiles/productdocuments/ALBR20COMMK/SPEC_47784925_SpecificationSheet.pdf. Ask Rockwell Automation (Allen-Bradley) or its representative for the current revision.
What are the minimum BACnet points to integrate the Rockwell Automation (Allen-Bradley) 20-COMM-B BACnet MS/TP adapter for PowerFlex 70 / 700 / 700VC / 700H?
Start with BV 10 Run/Stop (Run/stop command (1 = run)); AV 0 Reference 1 (%) (Speed reference, %); BV 13 Clear Faults (Fault reset (write 1)); BV 1 Running (Running status); AV 2 Output Frequency (Hz) (Output frequency, Hz); AV 3 Output Current (Amps) (Output current, A); BV 3 Fault (Drive fault); AV 12 Fault 1 (Latest fault code).
How do I enable BMS control of the Rockwell Automation (Allen-Bradley) 20-COMM-B BACnet MS/TP adapter for PowerFlex 70 / 700 / 700VC / 700H?
Drive parameter 90 [Speed Ref A Sel] = 22 (DPI Port 5) makes the drive follow the network reference; BV 10 then starts and stops it.
Does the Rockwell Automation (Allen-Bradley) 20-COMM-B BACnet MS/TP adapter for PowerFlex 70 / 700 / 700VC / 700H need a BACnet heartbeat or have a communication timeout?
Adapter parameter 03 [Comm Loss Time] (default 10 s, 0-180 s, 0 = off) sets when a network loss is detected; parameter 02 [Comm Loss Action] decides the response (default fault; also stop, zero data, hold last or send fault configuration from parameters 04/05).
How do I check these points on the real 20-COMM-B BACnet MS/TP adapter for PowerFlex 70 / 700 / 700VC / 700H?
Scan the network with a BACnet IP browser such as Easy BACnet, open the device and compare its object list with this table. Anything missing is usually an option that isn't installed or a point that is disabled in the controller's configuration.
More Rockwell Automation (Allen-Bradley) BACnet points lists
- Variable frequency drive (BACnet MS/TP adapter)
Rockwell Automation (Allen-Bradley) 22-COMM-B BACnet MS/TP adapter for PowerFlex 4 / 40 / 400
Allen-Bradley PowerFlex 4, 40 and 400 drives fitted with the 22-COMM-B internal BACnet MS/TP adapter.
Also known as: 22-COMM-B, PowerFlex 4 BACnet, PowerFlex 40 BACnet, PowerFlex 400 BACnet, 22COMM-UM008 - Variable frequency drive (BACnet IP option module)
Rockwell Automation (Allen-Bradley) PowerFlex 750-Series 20-750-BNETIP BACnet/IP option module
Allen-Bradley PowerFlex 753 and 755 drives fitted with the 20-750-BNETIP BACnet/IP option module.
Also known as: 20-750-BNETIP, PowerFlex 753 BACnet, PowerFlex 755 BACnet, 750COM-UM005
Source: BACnet MS/TP Adapter 20-COMM-B FRN 1.xxx User Manual · 20COMM-UM013C-EN-P · rev. 2006-10. Object names, instances and units are reproduced as published; descriptions are our own.