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VRF central controller gateway · BACnet points list
Mitsubishi Electric Procon MelcoBEMS2 (centralised controller BEMS gateway) BACnet points list
Updated 7 November 2026
The Procon MelcoBEMS2 connects to a Mitsubishi Electric centralised controller over Ethernet and republishes up to 50 air-conditioning groups on BACnet IP (and Modbus). Each group gets the same block of objects: on/off, mode, fan speed, setpoint, vane, filter sign and inhibit commands with matching states, room temperature, error code, energy and run-time totals, hot-water heat pump values and dual setpoints, plus system objects for M-NET and controller status and a global forced-off.
This page lists 71 BACnet objects for the Mitsubishi Electric Procon MelcoBEMS2 (centralised controller BEMS gateway) — 22 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Mitsubishi Electric’s own free documentation, linked below.
- Manufacturer
- Mitsubishi Electric
- Model
- Procon MelcoBEMS2 (centralised controller BEMS gateway)
- Equipment
- VRF central controller gateway
- Equipment type
- VRF & split air conditioners
- BACnet objects
- 71 (22 writable)
- Transport
- BACnet IP
- Firmware
- Not stated
- Also known as
- MelcoBEMS2, MelcoBEMS, Procon MelcoBEMS, MELCOBEMS
Reference only, provided as-is: verify against Mitsubishi Electric’s current documentation and the live device before use. Not official Mitsubishi Electric information. Terms of use.
BMS integration notes: Mitsubishi Electric Procon MelcoBEMS2 (centralised controller BEMS gateway)
Point the MelcoBEMS2 at the centralised controller's IP address in its web page, set the BACnet device instance and port, then map each group's on/off, mode, setpoint and fan commands with their state objects, room temperature and error code.
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 |
|---|---|---|---|
| BO 100101 | Grp nnn On Off Wr | Group on/off command | Command |
| MO 100104 | Operation Mode Wr | Operation mode command | Command |
| AO 100109 | Grp nnn Setpoint Temperature Wr | Setpoint command | Command |
| MO 100106 | Fan Speed Wr | Fan speed command | Command |
| BI 100102 | Grp nnn On Off Rd | On/off state | Read |
| MI 100105 | Operation Mode Rd | Current operation mode | Read |
| AI 100108 | Grp nnn Room Temperature | Room temperature | Read |
| AI 100103 | Grp nnn (Unit nn) Error Code | 4-digit error code, 8000 = no error | Read |
| BI 100026 | G50 Comms State | Centralised controller link, Active = OK | Read |
Enable & remote start
Functions to be inhibited locally (on/off, mode, setpoint, filter reset) must first be set on the centralised controller; Local Inhibit Wr then locks them at the remote controller.
Network setup
- Default web page http://192.168.1.11; the centralised controller IP address is entered there.
- Device instance, BACnet IP port, device name and location are set on the web page.
Watch out for
- New Setting Compare (BV 100027) set to Write COV makes the gateway ignore repeated identical writes; useful when the BMS writes cyclically.
- While M-NET is initialising (BI 100023 inactive) the units are offline to commands.
Mitsubishi Electric Procon MelcoBEMS2 (centralised controller BEMS gateway) 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.
Note: the source document has no read/write column, so access here is inferred from the object type (inputs read-only, values writable). Confirm on the live controller before writing.
| Description | States | |||||
|---|---|---|---|---|---|---|
| BOmin | 100101 | Grp nnn On Off Wr | On/off command | Command | Inactive=Off, Active=On | |
| BImin | 100102 | Grp nnn On Off Rd | On/off state | Read | Inactive=Off, Active=On | |
| AImin | 100103 | Grp nnn (Unit nn) Error Code | 4-digit error code, 8000 = no error | Read | ||
| MOmin | 100104 | Operation Mode Wr | Operation mode command | Command | 1=Cool, 2=Dry, 3=Fan, 4=Heat, 5=Auto, 6=Heat Recovery, 7=LC_Auto, 8=Bypass, 9=AutoHeat, 10=AutoCool, 11=Heating, 12=Eco-Heating, 13=Hot-Water, 14=Anti-Freeze, 15=Cooling, 16=Setback, 17=Setback Heat, 18=Setback Cool | |
| MImin | 100105 | Operation Mode Rd | Operation mode state | Read | 1=Cool, 2=Dry, 3=Fan, 4=Heat, 5=Auto, 6=Heat Recovery, 7=LC_Auto, 8=Bypass, 9=AutoHeat, 10=AutoCool, 11=Heating, 12=Eco-Heating, 13=Hot-Water, 14=Anti-Freeze, 15=Cooling, 16=Setback, 17=Setback Heat, 18=Setback Cool | |
| MOmin | 100106 | Fan Speed Wr | Fan speed command | Command | 1=Low, 2=Mid2 (low medium), 3=Mid1 (high medium), 4=High, 5=Auto | |
| MI | 100107 | Fan Speed Rd | Fan speed state | Read | 1=Low, 2=Mid2 (low medium), 3=Mid1 (high medium), 4=High, 5=Auto | |
| AImin | 100108 | Grp nnn Room Temperature | Room temperature | °C | Read | |
| AOmin | 100109 | Grp nnn Setpoint Temperature Wr | Setpoint command (cool/dry 19-30, heat 17-28, auto 19-28) | °C | Command | |
| AI | 100110 | Grp nnn Setpoint Temperature Rd | Setpoint state | °C | Read | |
| BI | 100111 | Filter Sign Rd | Filter sign state | Read | Inactive=Sign Off, Active=Sign On | |
| BO | 100112 | Filter Sign Wr | Filter sign reset | Command | Inactive=Clear Sign, Active=No Action | |
| BO | 100113 | Local Inhibit Wr | Inhibit local remote controller | Command | Inactive=Off, Active=Inhibit | |
| BI | 100114 | Local Inhibit Rd | Local inhibit state | Read | Inactive=Off, Active=Inhibited | |
| MO | 100115 | Air Direction Wr | Vane direction command | Command | 1=Horizontal, 2=Diagonal 0 (20%), 3=Diagonal 1, 4=Diagonal 2, 5=Vertical, 6=Swing, 7=Auto | |
| MI | 100116 | Air Direction Rd | Vane direction state | Read | 1=Horizontal, 2=Diagonal 0 (20%), 3=Diagonal 1, 4=Diagonal 2, 5=Vertical, 6=Swing, 7=Auto | |
| MO | 100117 | Ventilation Wr | Ventilation command (Lossnay/OA units) | Command | 1=Off, 2=Low, 3=High | |
| MI | 100118 | Ventilation Rd | Ventilation state (Lossnay/OA units) | Read | 1=Off, 2=Low, 3=High | |
| AI | 100119 | Unit nn Energy Day | Previous day energy | kWh | Read | |
| AI | 100120 | Unit nn Energy Month | Previous month energy | kWh | Read | |
| AI | 100131 | Inlet Water Temp Rd | Inlet water temperature (hot water heat pump) | °C | Read | |
| AI | 100132 | Outlet Water Temp Rd | Outlet water temperature | °C | Read | |
| AI | 100133 | Representative W Temp Rd | Representative water temperature | °C | Read | |
| AI | 100134 | Outdoor Temp Rd | Outdoor unit temperature | °C | Read | |
| AO | 100135 | Warm Water Setp Wr | Warm water setpoint command | °C | Command | |
| AI | 100136 | Warm Water Setp Rd | Warm water setpoint state | °C | Read | |
| AO | 100137 | Hot Water Setp Wr | Hot water setpoint command | °C | Command | |
| AI | 100138 | Hot Water Setp Rd | Hot water setpoint state | °C | Read | |
| BO | 100139 | Fan Mode Wr | Fan mode command | Command | ||
| BI | 100140 | Fan Mode Rd | Fan mode state | Read | ||
| AI | 100141 | Unit Cool time previous day | Cooling run time, previous day | Read | ||
| AI | 100142 | Unit Heat time previous day | Heating run time, previous day | Read | ||
| AI | 100143 | Unit On time previous day | On time, previous day | Read | ||
| AI | 100144 | Unit Cool time previous month | Cooling run time, previous month | Read | ||
| AI | 100145 | Unit Heat time previous month | Heating run time, previous month | Read | ||
| AI | 100146 | Unit On time previous month | On time, previous month | Read | ||
| AI | 100151 | Inlet Water Temp Read | Inlet water temperature | °C | Read | |
| AI | 100152 | Outlet Water Temp Read | Outlet water temperature | °C | Read | |
| AI | 100153 | Repr. Outlet Temp Read | Representative outlet temperature | °C | Read | |
| AI | 100154 | Outdoor Temp Read | Outdoor temperature | °C | Read | |
| AI | 100155 | Repr. Inlet Temp Read | Representative inlet temperature | °C | Read | |
| AI | 100156 | Brine Temp Read | Brine temperature | °C | Read | |
| AO | 100157 | Heat Setpoint Write | Heating setpoint command | °C | Command | |
| AI | 100158 | Heat Setpoint Read | Heating setpoint state | °C | Read | |
| AO | 100159 | Cool Setpoint Write | Cooling setpoint command | °C | Command | |
| AI | 100160 | Cool Setpoint Read | Cooling setpoint state | °C | Read | |
| BO | 100161 | Fan Mode Write | Fan mode command | Command | ||
| BO | 100162 | Fan Mode Read | Fan mode state (printed as a Binary Output) | Command | ||
| BI | 100163 | Test Run Read | Test run state | Read | ||
| AI | 100166 | Cool Setpoint Read | Cooling setpoint (dual setpoint) state | °C | Read | |
| AI | 100167 | Heat Setpoint Read | Heating setpoint (dual setpoint) state | °C | Read | |
| AI | 100168 | Auto Setpoint Read | Auto setpoint state | °C | Read | |
| AI | 100169 | Setback cool setpoint Read | Setback cooling setpoint state | °C | Read | |
| AI | 100170 | Setback heat setpoint Read | Setback heating setpoint state | °C | Read | |
| AO | 100166 | Cool Setpoint Read | Cooling setpoint (dual setpoint) write object | °C | Command | |
| AO | 100167 | Heat Setpoint Read | Heating setpoint (dual setpoint) write object | °C | Command | |
| AO | 100168 | Auto Setpoint Read | Auto setpoint write object | °C | Command | |
| AO | 100169 | Setback cool setpoint Read | Setback cooling setpoint write object | °C | Command | |
| AO | 100170 | Setback heat setpoint Read | Setback heating setpoint write object | °C | Command | |
| TL | 100141 | Unit Cool time previous day | Trend log of AI 1xxx41 | Read | ||
| TL | 100142 | Unit Heat time previous day | Trend log of AI 1xxx42 | Read | ||
| TL | 100143 | Unit On time previous day | Trend log of AI 1xxx43 | Read | ||
| TL | 100144 | Unit Cool time previous month | Trend log of AI 1xxx44 | Read | ||
| TL | 100145 | Unit Heat time previous month | Trend log of AI 1xxx45 | Read | ||
| TL | 100146 | Unit On time previous month | Trend log of AI 1xxx46 | Read | ||
| AI | 105122 | OC/BC Error Code | Outdoor/BC controller error code (name as detected) | Read | ||
| BI | 100023 | MNET Comms State | M-NET communication state | Read | Inactive=Init, Active=OK | |
| BO | 100024 | System Forced Off Wr | Global forced-off command | Command | Inactive=Off, Active=On | |
| BI | 100025 | System Forced Off Rd | Global forced-off state | Read | Inactive=Off, Active=On | |
| BImin | 100026 | G50 Comms State | Link to the centralised controller | Read | Inactive=Error, Active=OK | |
| BV | 100027 | New Setting Compare | Write handling: always or on change only | Write | Inactive=Write Always, Active=Write COV |
No points match these filters.
Object ID lookup: Mitsubishi Electric Procon MelcoBEMS2 point IDs by name
BO100101Grp nnn On Off WrBI100102Grp nnn On Off RdAI100103Grp nnn (Unit nn) Error CodeMO100104Operation Mode WrMI100105Operation Mode RdMO100106Fan Speed WrMI100107Fan Speed RdAI100108Grp nnn Room TemperatureAO100109Grp nnn Setpoint Temperature WrAI100110Grp nnn Setpoint Temperature RdBI100111Filter Sign RdBO100112Filter Sign WrBO100113Local Inhibit WrBI100114Local Inhibit RdMO100115Air Direction WrMI100116Air Direction RdMO100117Ventilation WrMI100118Ventilation RdAI100119Unit nn Energy DayAI100120Unit nn Energy MonthAI100131Inlet Water Temp RdAI100132Outlet Water Temp RdAI100133Representative W Temp RdAI100134Outdoor Temp RdAO100135Warm Water Setp WrAI100136Warm Water Setp RdAO100137Hot Water Setp WrAI100138Hot Water Setp RdBO100139Fan Mode WrBI100140Fan Mode RdAI100141Unit Cool time previous dayAI100142Unit Heat time previous dayAI100143Unit On time previous dayAI100144Unit Cool time previous monthAI100145Unit Heat time previous monthAI100146Unit On time previous monthAI100151Inlet Water Temp ReadAI100152Outlet Water Temp ReadAI100153Repr. Outlet Temp ReadAI100154Outdoor Temp ReadAI100155Repr. Inlet Temp ReadAI100156Brine Temp ReadAO100157Heat Setpoint WriteAI100158Heat Setpoint ReadAO100159Cool Setpoint WriteAI100160Cool Setpoint ReadBO100161Fan Mode WriteBO100162Fan Mode ReadBI100163Test Run ReadAI100166Cool Setpoint ReadAI100167Heat Setpoint ReadAI100168Auto Setpoint ReadAI100169Setback cool setpoint ReadAI100170Setback heat setpoint ReadAO100166Cool Setpoint ReadAO100167Heat Setpoint ReadAO100168Auto Setpoint ReadAO100169Setback cool setpoint ReadAO100170Setback heat setpoint ReadTL100141Unit Cool time previous dayTL100142Unit Heat time previous dayTL100143Unit On time previous dayTL100144Unit Cool time previous monthTL100145Unit Heat time previous monthTL100146Unit On time previous monthAI105122OC/BC Error CodeBI100023MNET Comms StateBO100024System Forced Off WrBI100025System Forced Off RdBI100026G50 Comms StateBV100027New Setting Compare
Integration notes
- Per-group instance = 1GGGPP: GGG = group number 001-050, PP = point. Group 001 is listed (e.g. 100101). OC/BC Error Code uses 1YYY22 with YYY = unit address 051-100 (105122 shown for 051).
- Object names are either generic (listed here, 'nnn' = group number) or the labels read from the centralised controller ('by Aircon'), chosen in the Labels setting.
- The guide prints no generic name for points 41-46 and 51-70; their object-list labels are shown instead. It labels AO 1xxx66-70 'Read' although they are output objects.
- Access is inferred from object type; the guide has no read/write column.
- Only groups configured on the centralised controller appear as BACnet objects. Water, brine and dual-setpoint points apply only to matching unit types.
- The older Procon MelcoBEMS (manual 1.05) uses the same numbering but has no points 51-63.
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 Procon MelcoBEMS2 (centralised controller BEMS gateway) 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 Mitsubishi Electric Procon MelcoBEMS2 (centralised controller BEMS gateway)
How many BACnet points does the Mitsubishi Electric Procon MelcoBEMS2 (centralised controller BEMS gateway) have?
This list has 71 BACnet objects: 31 analog inputs, 10 analog outputs, 8 binary inputs, 7 binary outputs, 1 binary value, 4 multi-state inputs, 4 multi-state outputs, 6 trend logs. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Mitsubishi Electric Procon MelcoBEMS2 (centralised controller BEMS gateway) BACnet points are writable?
22 of the 71 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. The source has no read/write column, so this is inferred from object type.
Where is the official Mitsubishi Electric Procon MelcoBEMS2 (centralised controller BEMS gateway) BACnet documentation?
The source is Procon MelcoBEMS2 Installation and Operation Manual (version 1.09), published free by Mitsubishi Electric at https://library.mitsubishielectric.co.uk/pdf/download_full/5540.
What are the minimum BACnet points to integrate the Mitsubishi Electric Procon MelcoBEMS2 (centralised controller BEMS gateway)?
Start with BO 100101 Grp nnn On Off Wr (Group on/off command); MO 100104 Operation Mode Wr (Operation mode command); AO 100109 Grp nnn Setpoint Temperature Wr (Setpoint command); MO 100106 Fan Speed Wr (Fan speed command); BI 100102 Grp nnn On Off Rd (On/off state); MI 100105 Operation Mode Rd (Current operation mode); AI 100108 Grp nnn Room Temperature (Room temperature); AI 100103 Grp nnn (Unit nn) Error Code (4-digit error code, 8000 = no error); BI 100026 G50 Comms State (Centralised controller link, Active = OK).
How do I enable BMS control of the Mitsubishi Electric Procon MelcoBEMS2 (centralised controller BEMS gateway)?
Functions to be inhibited locally (on/off, mode, setpoint, filter reset) must first be set on the centralised controller; Local Inhibit Wr then locks them at the remote controller.
How do I check these points on the real Procon MelcoBEMS2 (centralised controller BEMS gateway)?
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 Mitsubishi Electric BACnet points lists
- VRF central controller with BACnet IP
Mitsubishi Electric AE-200J / AE-50J / EW-50J BACnet (Japan)
Japan-market CITY MULTI building air conditioning groups, Lossnay ventilators, DT-R, hot water heat pumps and brine coolers managed by an AE-200J, AE-50J or EW-50J.
Also known as: AE-200J, AE-50J, EW-50J, AE-200J BACnet, 三菱電機 AE-200J BACnet機能 - VRF central controller with BACnet IP
Mitsubishi Electric AE-C400 / EW-C50 BACnet (BACS-AP50)
CITY MULTI VRF indoor unit groups, Lossnay, OA processing units, Air To Water and chiller units managed by an AE-C400 or EW-C50.
Also known as: AE-C400, AE-C400E, EW-C50, EW-C50E, BACS-AP50, BACS-AP50E, AE-C/EW-C BACnet - VRF BACnet IP gateway
Mitsubishi Electric BAC-HD150 BM Adapter
CITY MULTI VRF indoor unit groups, Lossnay, and Air To Water (PWFY) units on M-NET, up to 50 groups.
Also known as: BAC-HD150, BAC-HD/150, BACHD150, BM ADAPTER, CMCN BACnet points list, MEAPP0002 - Variable frequency drive (inverter)
Mitsubishi Electric FR-E800 inverter (BACnet IP, Ethernet models)
Mitsubishi Electric FR-E800 compact inverters with the built-in Ethernet port (FR-E8xx-E and safety/IP67 Ethernet variants) set to BACnet/IP.
Also known as: FR-E800, FR-E800-E, FR-E820, FR-E840, FR-E860, IB-0600871ENG - Variable frequency drive (HVAC fan and pump)
Mitsubishi Electric FR-F800 inverter (BACnet MS/TP; FR-F800-E BACnet IP)
Mitsubishi Electric FR-F800 fan and pump inverters (FR-F820/F840/F842/F846) on the RS-485 terminals, and FR-F800-E models on the built-in Ethernet port.
Also known as: FR-F800, FR-F800-E, FR-F820, FR-F840, FR-F842, FR-F846, FR-F820-E, FR-F840-E, FR-F842-E, FR-F846-E, Mitsubishi FR-F800 BACnet, IB-0600547ENG, IB-0600628ENG - VRF BACnet IP interface (legacy)
Mitsubishi Electric PAC-YG31CDA BACnet Interface
CITY MULTI indoor unit groups managed by up to ten G-50A central controllers.
Also known as: PAC-YG31CDA, G-50A BACnet, BACnet Interface for G-50A - Split air conditioner BACnet IP gateway (legacy)
Mitsubishi Electric Procon BAC-A/50 (Mr. SLIM)
Mitsubishi Electric Mr. SLIM (A-control) split air conditioners, up to 50 outdoor units each fitted with a Sub I/F board.
Also known as: BAC-A/50, BACA50, Procon BAC A 50, RM2428 - VRF BACnet IP gateway (legacy)
Mitsubishi Electric Procon BAC-IP/50
CITY MULTI indoor units, Lossnay/OA units and heat-pump boilers connected to one G-50 central controller (up to 50 units).
Also known as: BAC-IP/50, BACIP50, Procon BAC IP 50 - Split / VRF indoor unit interface (single unit)
Mitsubishi Electric Procon MelcoBEMS MINI (A1M+) - Air-To-Air units
Mitsubishi Electric air-to-air split and indoor units connected one per adapter through the CN105 connector.
Also known as: A1M+, MelcoBEMS MINI A1M PLUS, MelcoBEMS MINI (A1M), Procon A1M - Air-to-water heat pump interface
Mitsubishi Electric Procon MelcoBEMS MINI (A1M+) - Air-To-Water (Ecodan) units
Mitsubishi Electric air-to-water (Ecodan) heat pump systems with an FTC controller, one adapter per system.
Also known as: A1M+ ATW, MelcoBEMS MINI A1M PLUS Ecodan, Procon A1M+ Ecodan - Energy recovery ventilator interface
Mitsubishi Electric Procon MelcoBEMS MINI (A1M+) - Lossnay units
Mitsubishi Electric Lossnay energy recovery ventilators supported by the A1M+ (listed in the manual appendix).
Also known as: A1M+ Lossnay, MelcoBEMS MINI A1M PLUS Lossnay
Source: Procon MelcoBEMS2 Installation and Operation Manual (version 1.09). Object names, instances and units are reproduced as published; descriptions are our own.