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BACnet instance calculator · AE-C400 / EW-C50
Mitsubishi Electric AE-C400 / EW-C50 BACnet Instance Calculator
Free browser tool · nothing is uploaded · 5 November 2026
With the BACnet license, the AE-C400 and EW-C50 number objects by class, address and point. Enter an address to get the group, outdoor unit, PI controller, interlocked unit and chiller objects for it.
AE-C400 / EW-C50 instances are six digits CC NN PP: an object class (01 group, 41 PI controller, 51 outdoor unit, 61 interlocked unit, 71 chiller system, 91 chiller unit), the address (01-50) and the point. Group 7 Set Temp is AV 10710; outdoor unit 51 (class address 01) COP is AI 510101.
Mitsubishi Electric calculator
The calculator needs JavaScript. The formula and a worked example are below.
Which unit does this instance belong to?
How the numbers are built
instance = class x 10000 + address x 100 + point
| Part | Meaning | Range |
|---|---|---|
| CC | Object class: 01 group, 41 PI controller, 51 outdoor unit, 61 interlocked unit, 71 chiller system, 91 chiller unit | 01-91 |
| NN | Address of that group or unit (99 = collective) | 01-50 |
| PP | Point number | 01-88 |
For outdoor units (class 51) the address is the M-NET outdoor address minus 50, so M-NET address 51 is 01. Group and other addresses come from the controller's initial settings.
Worked example: address 07
The first objects for address 07 on the AE-C400 / EW-C50, worked out with the formula above:
| Object | Name (as printed) | What it is |
|---|---|---|
| BO 10701 | On Off Setup | Start/stop command for the group |
| BI 10702 | On Off State | Group run status |
| BI 10703 | Alarm Signal | Group alarm |
| MI 10704 | Error Code | Error category for the group |
| MO 10705 | Operational Mode Setup | Operating mode command |
| MI 10706 | Operational Mode State | Current operating mode |
| BI 410703 | PIcontroller Alarm Signal | PI controller alarm |
| ACC 410740 | PIcontroller Electric Energy 1 | Metered energy, PI controller channel 1 |
| ACC 410741 | PIcontroller Electric Energy 2 | Metered energy, PI controller channel 2 |
| ACC 410742 | PIcontroller Electric Energy 3 | Metered energy, PI controller channel 3 |
| ACC 410743 | PIcontroller Electric Energy 4 | Metered energy, PI controller channel 4 |
| TL 410784 | Trend Log PIcontroller Electric Energy 1 | Trend log of PI controller channel 1 |
| AI 510701 | COP | Outdoor unit coefficient of performance |
| ACC 610739 | Interlocked Units Apportioned Electric Energy | Apportioned energy per interlocked unit |
| ACC 610744 | Interlocked Units Apportionment Parameter | Apportionment parameter per interlocked unit |
| TL 610783 | Trend Log Interlocked Units Apportioned Electric Energy | Trend log of interlocked unit energy |
| TL 610788 | Trend Log Interlocked Units Apportionment Parameter | Trend log of interlocked unit parameter |
| BO 710701 | Chiller On Off Setup | Chiller start/stop command |
| BI 710702 | Chiller On Off State | Chiller run status |
| MO 710703 | Chiller Operational Mode Setup | Chiller mode command |
| MI 710704 | Chiller Operational Mode State | Current chiller mode |
| MO 710705 | Chiller Fan Mode Setup | Chiller fan mode command |
| MI 710706 | Chiller Fan Mode State | Current chiller fan mode |
| BI 910711 | Chiller Unit Alarm Signal | Alarm for an individual chiller unit |
Source
Formula and objects from Centralized Controller AE-C400/EW-C50, BM ADAPTER BACS-AP50 Instruction Book <BACnet function> · WT10808X04 (manufacturer document ↗), re-typed in our points list. Object names are shown as printed.
Check it against the live device. The calculator applies the formula from the manufacturer’s documentation; the gateway in front of you may expose fewer objects or use other numbers after a firmware change. Easy BACnet scans a network for BACnet IP devices from an Android phone and reads every object on them — a quick way to confirm one unit before you map a whole building.
Questions
How do I work out a Mitsubishi Electric instance number?
AE-C400 / EW-C50 instances are six digits CC NN PP: an object class (01 group, 41 PI controller, 51 outdoor unit, 61 interlocked unit, 71 chiller system, 91 chiller unit), the address (01-50) and the point. Group 7 Set Temp is AV 10710; outdoor unit 51 (class address 01) COP is AI 510101.
What does the first part of an AE-C400 instance mean?
It is the object class. 01 is a group, 41 a PI controller, 51 an outdoor unit, 61 an interlocked unit, 71 a chiller system and 91 a chiller unit. 10710 is class 01 (leading zero dropped), address 07, point 10.
Do I need anything enabled first?
The BACnet connection license must be registered and the controller must show ONLINE. Apportioned energy objects also need the Charge license.
Is this Mitsubishi Electric calculator official?
No. It applies the formula printed in Mitsubishi Electric's own documentation to the points list in our library. Confirm the numbers against a scan of the live device before you map or write anything.
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