Easy BACnet- Home
- BACnet instance calculators
- Mitsubishi Electric PAC-YG31CDA
BACnet instance calculator · PAC-YG31CDA (G-50A)
Mitsubishi Electric PAC-YG31CDA BACnet Instance Calculator
Free browser tool · nothing is uploaded · 5 November 2026
The legacy PAC-YG31CDA BACnet interface serves up to ten G-50A controllers and numbers each group's objects by G-50A number, group and point.
PAC-YG31CDA instances are six digits AA GG PP: the G-50A number (01-10), the group number (01-50) and the point. G-50A 2, group 4, Room Temp (point 09) is AI 20409. System Forced Off is one object per G-50A at AA9921.
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 = G-50A number x 10000 + group x 100 + point
| Part | Meaning | Range |
|---|---|---|
| AA | G-50A number set in the PAC-YG31CDA software | 01-10 |
| GG | Group number on that G-50A | 01-50 |
| PP | Point number | 01-23 |
Each G-50A gets a number 1-10 linked to its IP address in the PAC-YG31CDA software; that number is the first two digits.
Worked example: G-50A 02, group 04
The first objects for G-50A 02, group 04 on the PAC-YG31CDA, worked out with the formula above:
| Object | Name (as printed) | What it is |
|---|---|---|
| BO 20401 | On/Off (setup) | Start/stop command for the group |
| BI 20402 | On/Off (state) | Group run status |
| BI 20403 | Alarm signal | Group alarm |
| MI 20404 | Error Code | Error category for the group |
| MO 20405 | Operation mode (setup) | Operating mode command |
| MI 20406 | Operation mode (state) | Current operating mode |
| BV 29921 | System Forced Off | Forced off for one G-50A system |
Source
Formula and objects from Mitsubishi Electric Air Conditioning Network System BACnet Interface: PAC-YG31CDA (Ver. 1.30) Operation Manual · WT04221X03 · rev. 2004-03 (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?
PAC-YG31CDA instances are six digits AA GG PP: the G-50A number (01-10), the group number (01-50) and the point. G-50A 2, group 4, Room Temp (point 09) is AI 20409. System Forced Off is one object per G-50A at AA9921.
Is the PAC-YG31CDA the same numbering as the BAC-HD150?
The pattern is the same (system, group, point) and most point numbers match, but the first two digits are the G-50A number (01-10) instead of the M-NET number. Use the calculator for your hardware.
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.
More instance calculators
- Mitsubishi Electric BAC-HD150 BM AdapterThe BAC-HD150 BM Adapter numbers every CITY MULTI group's objects as M-NET number, group number and point number.
instance = M-NET number x 10000 + group x 100 + point - Mitsubishi Electric AE-C400 / EW-C50With the BACnet license, the AE-C400 and EW-C50 number objects by class, address and point.
instance = class x 10000 + address x 100 + point - Mitsubishi Electric Procon BAC-IP/50The Procon BAC-IP/50 gives every unit on its G-50 a block of objects numbered 1, the 3-digit unit address and the point number.
instance = 100000 + unit address x 100 + point - Fujitsu UTY-VBGX VRF gatewayFujitsu's UTY-VBGX gateway puts the refrigerant system and unit address inside every instance number.
instance = point code x 10000 + refrigerant system x 100 + unit address - Daikin DMS502B71 VRV BACnet interfaceThe Daikin DMS502B71 BACnet interface gives every VRV indoor unit group the same 35-member object template.
instance = unit number x 256 + member number - Toshiba BMS-IFBN1281U BN interfaceToshiba Carrier's BN interface gives every indoor unit the same block of objects, numbered from the unit's central control address and a fixed function code.
instance = central control address x 256 + function code - Gree GMS GW BACnet converterGree's GMS GW 1 and GMS GW 12 converters number every split unit's objects from its line and remote control address.
instance = class x 1048576 + (line - 1) x 131072 + address x 256 + object - CoolAutomation CoolMasterNet / CooLinkCoolAutomation gateways serve every indoor unit, whatever the AC brand, as the same 16 objects at its virtual address (VA).
instance = VA x 256 + object index