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Split air conditioner BACnet IP gateway (legacy) · BACnet points list
Mitsubishi Electric Procon BAC-A/50 (Mr. SLIM) BACnet points list
Updated 7 November 2026
The Procon BAC-A/50 is an older Mitsubishi Electric UK gateway that links up to 50 Mr. SLIM systems (through Sub I/F boards daisy-chained to its TB12 terminals) to BACnet IP. Each unit address gets the same block of 14 objects (setup _w, state _r, error code and room temperature) named after the unit name typed into the configuration program, plus four system objects. It is the Mr. SLIM sibling of the Procon BAC-IP/50 (CITY MULTI via G-50) and has a smaller object set.
This page lists 18 BACnet objects for the Mitsubishi Electric Procon BAC-A/50 (Mr. SLIM) — 9 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 BAC-A/50 (Mr. SLIM)
- Equipment
- Split air conditioner BACnet IP gateway (legacy)
- Equipment type
- VRF & split air conditioners
- BACnet objects
- 18 (9 writable)
- Transport
- BACnet IP
- Firmware
- Product version 1.05 (PICS 06 Nov 2007)
- Default device instance
- 14
- Also known as
- BAC-A/50, BACA50, Procon BAC A 50, RM2428
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 BAC-A/50 (Mr. SLIM)
Wire the Sub I/F boards to TB12, set IP, Device ID and unit names with the PC configuration program, then map each unit's _w (command) and _r (status) objects at 1UUUPP. BV 100024 switches every unit off at once.
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 | nnn_ON_w | Start/stop the unit | Command |
| MO 100104 | nnn_MD_w | Command the operating mode | Command |
| AO 100109 | nnn_SP_w | Setpoint command | Command |
| MO 100106 | nnn_FS_w | Fan speed: 1 low, 2 mid2, 3 mid1, 4 high | Command |
| BI 100102 | nnn_ON_r | Confirm run status | Read |
| AI 100108 | nnn_RA | Room temperature | Read |
| AI 100103 | nnn_ECode | Error code (8000 = no error) | Read |
Enable & remote start
The Enable Link terminals take a normally-closed volt-free contact (shipped with a wire link). Opening it sends Forced-Off to all units every 5 s; closing it sends one Reset, so later BMS Forced-Off commands (BV 100024) are not overridden.
Network setup
- Level-2 reset defaults: IP 192.168.1.14, mask 255.255.255.0, BACnet Device ID 14, device name Procon BAC-A/50, units to scan 50.
- Device ID, device name and object names are set only through the PC configuration program (RS232).
- Set Sys_Units_To_Scan (AV 100023) to the number of units to shorten the start-up scan; it takes effect after a restart.
Watch out for
- If the BMS writes commands continuously, set BV 100026 active so the gateway only sends changed values.
- The gateway polls one unit every 2 s, so on a 50-unit system each unit is refreshed only about every 100 s.
Mitsubishi Electric Procon BAC-A/50 (Mr. SLIM) 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 | nnn_ON_w | On/Off setup | Command | Inactive=Off, Active=On | |
| BImin | 100102 | nnn_ON_r | On/Off state | Read | Inactive=Off, Active=On | |
| AImin | 100103 | nnn_ECode | Error code, 4 digits (8000 = no error) | Read | ||
| MOmin | 100104 | nnn_MD_w | Operation mode setup | Command | 1=Cool, 2=Dry, 3=Fan, 4=Heat, 5=Auto, 6=Ventilation | |
| MI | 100105 | nnn_MD_r | Operation mode state | Read | 1=Cool, 2=Dry, 3=Fan, 4=Heat, 5=Auto, 6=Ventilation | |
| MOmin | 100106 | nnn_FS_w | Fan speed setup | Command | 1=Low, 2=Mid2, 3=Mid1, 4=High | |
| MI | 100107 | nnn_FS_r | Fan speed state | Read | 1=Low, 2=Mid2, 3=Mid1, 4=High | |
| AImin | 100108 | nnn_RA | Room temperature, 8-39 °C | °C | Read | |
| AOmin | 100109 | nnn_SP_w | Setpoint setup (cool/dry 19-30, heat 17-28, auto 19-28) | °C | Command | |
| AI | 100110 | nnn_SP_r | Setpoint state | °C | Read | |
| BI | 100111 | nnn_FL_r | Filter sign state | Read | Inactive=Sign Off, Active=Sign On | |
| BO | 100112 | nnn_FL_w | Filter sign reset | Command | Inactive=Clear Sign, Active=No Action | |
| BO | 100113 | nnn_LI_w | Local (remote controller) inhibit setup | Command | Inactive=Off, Active=Inhibit | |
| BI | 100114 | nnn_LI_r | Local inhibit state | Read | Inactive=Off, Active=Inhibited | |
| AV | 100023 | Sys_Units_To_Scan | Number of units scanned, 1-50 (applies after restart) | Write | ||
| BV | 100024 | Sys_Forced_Off_Ctrl | System forced off (all units off) | Write | Inactive=Off, Active=On | |
| BI | 100025 | Sys_Enable_Link_State | Enable Link contact present | Read | Inactive=No Link Present, Active=Link Present | |
| BV | 100026 | Sys_New_Setting_Compare | Write commands only when changed | Write | Inactive=Always write, Active=Write only if different |
No points match these filters.
Object ID lookup: Mitsubishi Electric Procon BAC-A/50 point IDs by name
BO100101nnn_ON_wBI100102nnn_ON_rAI100103nnn_ECodeMO100104nnn_MD_wMI100105nnn_MD_rMO100106nnn_FS_wMI100107nnn_FS_rAI100108nnn_RAAO100109nnn_SP_wAI100110nnn_SP_rBI100111nnn_FL_rBO100112nnn_FL_wBO100113nnn_LI_wBI100114nnn_LI_rAV100023Sys_Units_To_ScanBV100024Sys_Forced_Off_CtrlBI100025Sys_Enable_Link_StateBV100026Sys_New_Setting_Compare
Integration notes
- Per-unit instance = 1UUUPP: UUU = unit address 001-050, PP = point 01-14. Instances here use unit 001 (e.g. 100101). Object names start with the unit name (nnn) set in the configuration program.
- Points 1xxx15-1xxx22 are listed as unused and are not included.
- The manual has no access column: commandable/writable access is inferred from the object types and Setup/State labels.
- Setpoint ranges depend on mode: cool/dry 19-30 °C, heat 17-28 °C, auto 19-28 °C; in other modes the setpoint is fixed at 25 °C.
- Segmentation is not supported and the maximum APDU is 206 octets.
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 BAC-A/50 (Mr. SLIM) 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 BAC-A/50 (Mr. SLIM)
How many BACnet points does the Mitsubishi Electric Procon BAC-A/50 (Mr. SLIM) have?
This list has 18 BACnet objects: 3 analog inputs, 1 analog output, 1 analog value, 4 binary inputs, 3 binary outputs, 2 binary values, 2 multi-state inputs, 2 multi-state outputs. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Mitsubishi Electric Procon BAC-A/50 (Mr. SLIM) BACnet points are writable?
9 of the 18 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 BAC-A/50 (Mr. SLIM) BACnet documentation?
The source is Procon BAC-A/50 Installation Instructions, revision 2007-11-07 (v1.00), published free by Mitsubishi Electric at https://library.mitsubishielectric.co.uk/pdf/download_full/387.
What are the minimum BACnet points to integrate the Mitsubishi Electric Procon BAC-A/50 (Mr. SLIM)?
Start with BO 100101 nnn_ON_w (Start/stop the unit); MO 100104 nnn_MD_w (Command the operating mode); AO 100109 nnn_SP_w (Setpoint command); MO 100106 nnn_FS_w (Fan speed: 1 low, 2 mid2, 3 mid1, 4 high); BI 100102 nnn_ON_r (Confirm run status); AI 100108 nnn_RA (Room temperature); AI 100103 nnn_ECode (Error code (8000 = no error)).
How do I enable BMS control of the Mitsubishi Electric Procon BAC-A/50 (Mr. SLIM)?
The Enable Link terminals take a normally-closed volt-free contact (shipped with a wire link). Opening it sends Forced-Off to all units every 5 s; closing it sends one Reset, so later BMS Forced-Off commands (BV 100024) are not overridden.
How do I check these points on the real Procon BAC-A/50 (Mr. SLIM)?
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 - 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 - VRF central controller gateway
Mitsubishi Electric Procon MelcoBEMS2 (centralised controller BEMS gateway)
Mitsubishi Electric City Multi and split systems managed by an AE-C400/EW-C50, AE-200/EB50, AG-150A or GB-50ADA centralised controller (up to 50 groups).
Also known as: MelcoBEMS2, MelcoBEMS, Procon MelcoBEMS, MELCOBEMS
Source: Procon BAC-A/50 Installation Instructions · rev. 2007-11-07 (v1.00). Object names, instances and units are reproduced as published; descriptions are our own.