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Boiler cascade controller gateway · BACnet points list
Bosch Buderus Cascade SSB 255 / 399 / 512 (ProtoAir FPA-W44, C_Platform) BACnet points list
Updated 6 November 2026
Bosch's ProtoAir FPA-W44 start-up guide maps the C_Platform (Buderus SSB 255/399/512 cascade) to 154 objects: unit selection and control register, state, status, error code, pump states, temperatures, firing rate, flame current, ignition and burn-hour counters, 16-deep lockout and blocking history, state/error/firing rate of up to 15 dependent boilers, and read and write copies of the CH/DHW mode, setpoints, reset curve, warm weather shutdown and night setback.
This page lists 154 BACnet objects for the Bosch Buderus Cascade SSB 255 / 399 / 512 (ProtoAir FPA-W44, C_Platform) — 14 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Bosch’s own free documentation, linked below.
- Manufacturer
- Bosch
- Model
- Buderus Cascade SSB 255 / 399 / 512 (ProtoAir FPA-W44, C_Platform)
- Equipment
- Boiler cascade controller gateway
- Equipment type
- Boilers & water heaters
- BACnet objects
- 154 (14 writable)
- Transport
- BACnet IP, BACnet MS/TP
- Firmware
- Not stated
- Also known as
- SSB 255, SSB 399, SSB 512, Buderus SSB, C_Platform, ProtoAir FPA-W44, Bosch cascade
Reference only, provided as-is: verify against Bosch’s current documentation and the live device before use. Not official Bosch information. Terms of use.
BMS integration notes: Bosch Buderus Cascade SSB 255 / 399 / 512 (ProtoAir FPA-W44, C_Platform)
Map the CH mode and setpoint AVs for control and read State, Status, supply and return temperatures, firing rate, the error code and the dependent boilers' state. The guide does not explain the Control Register or the mode codes, so check the boiler's Modbus documentation before writing.
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 |
|---|---|---|---|
| AV 144 | CH Mode | Central heating mode command | Write |
| AV 146 | CH Setpoint | Central heating setpoint | Write |
| AV 2 | Control Register | Control register; see the boiler Modbus manual | Write |
| AI 3 | State | Boiler state code | Read |
| AI 4 | Status | Boiler status code | Read |
| AI 9 | Supply Temperature | Supply water temperature | Read |
| AI 15 | Firing Rate | Firing rate | Read |
| AI 87 | Dependent 01 State | Dependent 01 state (repeat for 02-15) | Read |
| AI 5 | Error Code | Active error code | Read |
Enable & remote start
AV 144-155 are the writable mode, setpoint, reset-curve and night setback values (their read-back copies are AI 132-143). AV 2 Control Register is writable too; the guide does not say how it is used.
Network setup
- ProtoAir FPA-W44 to the boiler: Modbus RTU, 9600 baud; the C_Platform profile is auto-discovered.
- BACnet device instance = Node_Offset (default 50,000) + Node-ID; set BACnet Virtual Server Nodes when several devices share the gateway.
- Field protocol (BACnet IP, BACnet MS/TP, Modbus TCP or N2) is chosen in the ProtoAir web app.
Watch out for
- Access is inferred from the N2 type (AO = writable); the table has no read/write column.
- No units, ranges or code tables are given; temperature units follow AV 1 Unit Selection.
- Object AI 17 is not used; one writable object is printed as AV 140 where AV 150 is expected.
Bosch Buderus Cascade SSB 255 / 399 / 512 (ProtoAir FPA-W44, C_Platform) 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 | |||||
|---|---|---|---|---|---|---|
| AV | 1 | Unit Selection | Write | |||
| AVmin | 2 | Control Register | Control word for writes (meaning not given in the guide) | Write | ||
| AImin | 3 | State | Read | |||
| AImin | 4 | Status | Read | |||
| AImin | 5 | Error Code | Read | |||
| AI | 6 | CH Pump | Read | |||
| AI | 7 | DHW Pump | Read | |||
| AI | 8 | General Pump | Read | |||
| AImin | 9 | Supply Temperature | Read | |||
| AI | 10 | Return Temperature | Read | |||
| AI | 11 | DHW Temperature | Read | |||
| AI | 12 | Flue Gas Temperature | Read | |||
| AI | 13 | System (Heat Exchanger) Temperature | Read | |||
| AI | 14 | Outside Temperature | Read | |||
| AImin | 15 | Firing Rate | Read | |||
| AI | 16 | Flame (Ionization) Current | Read | |||
| AI | 18 | Successful Ignition Counter | Read | |||
| AI | 19 | Failed Ignition Counter | Read | |||
| AI | 20 | Flame Failure Counter | Read | |||
| AI | 21 | Burn Hours CH | Read | |||
| AI | 22 | Burn Hours DHW | Read | |||
| AI | 23 | 1st Lockout In History | Read | |||
| AI | 24 | 2nd Lockout In History | Read | |||
| AI | 25 | 3rd Lockout In History | Read | |||
| AI | 26 | 4th Lockout In History | Read | |||
| AI | 27 | 5th Lockout In History | Read | |||
| AI | 28 | 6th Lockout In History | Read | |||
| AI | 29 | 7th Lockout In History | Read | |||
| AI | 30 | 8th Lockout In History | Read | |||
| AI | 31 | 9th Lockout In History | Read | |||
| AI | 32 | 10th Lockout In History | Read | |||
| AI | 33 | 11th Lockout In History | Read | |||
| AI | 34 | 12th Lockout In History | Read | |||
| AI | 35 | 13th Lockout In History | Read | |||
| AI | 36 | 14th Lockout In History | Read | |||
| AI | 37 | 15th Lockout In History | Read | |||
| AI | 38 | 16th Lockout In History | Read | |||
| AI | 39 | Time After 1st Lockout | Read | |||
| AI | 40 | Time After 2nd Lockout | Read | |||
| AI | 41 | Time After 3rd Lockout | Read | |||
| AI | 42 | Time After 4th Lockout | Read | |||
| AI | 43 | Time After 5th Lockout | Read | |||
| AI | 44 | Time After 6th Lockout | Read | |||
| AI | 45 | Time After 7th Lockout | Read | |||
| AI | 46 | Time After 8th Lockout | Read | |||
| AI | 47 | Time After 9th Lockout | Read | |||
| AI | 48 | Time After 10th Lockout | Read | |||
| AI | 49 | Time After 11th Lockout | Read | |||
| AI | 50 | Time After 12th Lockout | Read | |||
| AI | 51 | Time After 13th Lockout | Read | |||
| AI | 52 | Time After 14th Lockout | Read | |||
| AI | 53 | Time After 15th Lockout | Read | |||
| AI | 54 | Time After 16th Lockout | Read | |||
| AI | 55 | 1st Blocking In History | Read | |||
| AI | 56 | 2nd Blocking In History | Read | |||
| AI | 57 | 3rd Blocking In History | Read | |||
| AI | 58 | 4th Blocking In History | Read | |||
| AI | 59 | 5th Blocking In History | Read | |||
| AI | 60 | 6th Blocking In History | Read | |||
| AI | 61 | 7th Blocking In History | Read | |||
| AI | 62 | 8th Blocking In History | Read | |||
| AI | 63 | 9th Blocking In History | Read | |||
| AI | 64 | 10th Blocking In History | Read | |||
| AI | 65 | 11th Blocking In History | Read | |||
| AI | 66 | 12th Blocking In History | Read | |||
| AI | 67 | 13th Blocking In History | Read | |||
| AI | 68 | 14th Blocking In History | Read | |||
| AI | 69 | 15th Blocking In History | Read | |||
| AI | 70 | 16th Blocking In History | Read | |||
| AI | 71 | Time After 1st Blocking | Read | |||
| AI | 72 | Time After 2nd Blocking | Read | |||
| AI | 73 | Time After 3rd Blocking | Read | |||
| AI | 74 | Time After 4th Blocking | Read | |||
| AI | 75 | Time After 5th Blocking | Read | |||
| AI | 76 | Time After 6th Blocking | Read | |||
| AI | 77 | Time After 7th Blocking | Read | |||
| AI | 78 | Time After 8th Blocking | Read | |||
| AI | 79 | Time After 9th Blocking | Read | |||
| AI | 80 | Time After 10th Blocking | Read | |||
| AI | 81 | Time After 11th Blocking | Read | |||
| AI | 82 | Time After 12th Blocking | Read | |||
| AI | 83 | Time After 13th Blocking | Read | |||
| AI | 84 | Time After 14th Blocking | Read | |||
| AI | 85 | Time After 15th Blocking | Read | |||
| AI | 86 | Time After 16th Blocking | Read | |||
| AImin | 87 | Dependent 01 State | Read | |||
| AI | 88 | Dependent 01 Error Code | Read | |||
| AI | 89 | Dependent 01 Firing Rate | Read | |||
| AI | 90 | Dependent 02 State | Read | |||
| AI | 91 | Dependent 02 Error Code | Read | |||
| AI | 92 | Dependent 02 Firing Rate | Read | |||
| AI | 93 | Dependent 03 State | Read | |||
| AI | 94 | Dependent 03 Error Code | Read | |||
| AI | 95 | Dependent 03 Firing Rate | Read | |||
| AI | 96 | Dependent 04 State | Read | |||
| AI | 97 | Dependent 04 Error Code | Read | |||
| AI | 98 | Dependent 04 Firing Rate | Read | |||
| AI | 99 | Dependent 05 State | Read | |||
| AI | 100 | Dependent 05 Error Code | Read | |||
| AI | 101 | Dependent 05 Firing Rate | Read | |||
| AI | 102 | Dependent 06 State | Read | |||
| AI | 103 | Dependent 06 Error Code | Read | |||
| AI | 104 | Dependent 06 Firing Rate | Read | |||
| AI | 105 | Dependent 07 State | Read | |||
| AI | 106 | Dependent 07 Error Code | Read | |||
| AI | 107 | Dependent 07 Firing Rate | Read | |||
| AI | 108 | Dependent 08 State | Read | |||
| AI | 109 | Dependent 08 Error Code | Read | |||
| AI | 110 | Dependent 08 Firing Rate | Read | |||
| AI | 111 | Dependent 09 State | Read | |||
| AI | 112 | Dependent 09 Error Code | Read | |||
| AI | 113 | Dependent 09 Firing Rate | Read | |||
| AI | 114 | Dependent 10 State | Read | |||
| AI | 115 | Dependent 10 Error Code | Read | |||
| AI | 116 | Dependent 10 Firing Rate | Read | |||
| AI | 117 | Dependent 11 State | Read | |||
| AI | 118 | Dependent 11 Error Code | Read | |||
| AI | 119 | Dependent 11 Firing Rate | Read | |||
| AI | 120 | Dependent 12 State | Read | |||
| AI | 121 | Dependent 12 Error Code | Read | |||
| AI | 122 | Dependent 12 Firing Rate | Read | |||
| AI | 123 | Dependent 13 State | Read | |||
| AI | 124 | Dependent 13 Error Code | Read | |||
| AI | 125 | Dependent 13 Firing Rate | Read | |||
| AI | 126 | Dependent 14 State | Read | |||
| AI | 127 | Dependent 14 Error Code | Read | |||
| AI | 128 | Dependent 14 Firing Rate | Read | |||
| AI | 129 | Dependent 15 State | Read | |||
| AI | 130 | Dependent 15 Error Code | Read | |||
| AI | 131 | Dependent 15 Firing Rate | Read | |||
| AI | 132 | CH Mode | Read | |||
| AI | 133 | DHW Mode | Read | |||
| AI | 134 | CH Setpoint | Read | |||
| AI | 135 | DHW Setpoint | Read | |||
| AI | 136 | Reset Curve Boiler Design | Read | |||
| AI | 137 | Reset Curve Boiler Mild Weather | Read | |||
| AI | 138 | Reset Curve Outdoor Mild Weather | Read | |||
| AI | 139 | Reset Curve Outdoor Design | Read | |||
| AI | 140 | Warm Weather Shutdown | Read | |||
| AI | 141 | Reset Curve Boiler Maximum | Read | |||
| AI | 142 | Reset Curve Boiler Minimum | Read | |||
| AI | 143 | Night Setback | Read | |||
| AVmin | 144 | CH Mode | Write | |||
| AV | 145 | DHW Mode | Write | |||
| AVmin | 146 | CH Setpoint | Write | |||
| AV | 147 | DHW Setpoint | Write | |||
| AV | 148 | Reset Curve Boiler Design | Write | |||
| AV | 149 | Reset Curve Boiler Mild Weather | Write | |||
| AV | 140 | Reset Curve Outdoor Mild Weather | Printed as AV 140 between AV 149 and AV 151 (likely 150) | Write | ||
| AV | 151 | Reset Curve Outdoor Design | Write | |||
| AV | 152 | Warm Weather Shutdown | Write | |||
| AV | 153 | Reset Curve Boiler Maximum | Write | |||
| AV | 154 | Reset Curve Boiler Minimum | Write | |||
| AV | 155 | Night Setback | Write |
No points match these filters.
Object ID lookup: Bosch Buderus Cascade SSB 255 / 399 / 512 point IDs by name
AV1Unit SelectionAV2Control RegisterAI3StateAI4StatusAI5Error CodeAI6CH PumpAI7DHW PumpAI8General PumpAI9Supply TemperatureAI10Return TemperatureAI11DHW TemperatureAI12Flue Gas TemperatureAI13System (Heat Exchanger) TemperatureAI14Outside TemperatureAI15Firing RateAI16Flame (Ionization) CurrentAI18Successful Ignition CounterAI19Failed Ignition CounterAI20Flame Failure CounterAI21Burn Hours CHAI22Burn Hours DHWAI231st Lockout In HistoryAI242nd Lockout In HistoryAI253rd Lockout In HistoryAI264th Lockout In HistoryAI275th Lockout In HistoryAI286th Lockout In HistoryAI297th Lockout In HistoryAI308th Lockout In HistoryAI319th Lockout In HistoryAI3210th Lockout In HistoryAI3311th Lockout In HistoryAI3412th Lockout In HistoryAI3513th Lockout In HistoryAI3614th Lockout In HistoryAI3715th Lockout In HistoryAI3816th Lockout In HistoryAI39Time After 1st LockoutAI40Time After 2nd LockoutAI41Time After 3rd LockoutAI42Time After 4th LockoutAI43Time After 5th LockoutAI44Time After 6th LockoutAI45Time After 7th LockoutAI46Time After 8th LockoutAI47Time After 9th LockoutAI48Time After 10th LockoutAI49Time After 11th LockoutAI50Time After 12th LockoutAI51Time After 13th LockoutAI52Time After 14th LockoutAI53Time After 15th LockoutAI54Time After 16th LockoutAI551st Blocking In HistoryAI562nd Blocking In HistoryAI573rd Blocking In HistoryAI584th Blocking In HistoryAI595th Blocking In HistoryAI606th Blocking In HistoryAI617th Blocking In HistoryAI628th Blocking In HistoryAI639th Blocking In HistoryAI6410th Blocking In HistoryAI6511th Blocking In HistoryAI6612th Blocking In HistoryAI6713th Blocking In HistoryAI6814th Blocking In HistoryAI6915th Blocking In HistoryAI7016th Blocking In HistoryAI71Time After 1st BlockingAI72Time After 2nd BlockingAI73Time After 3rd BlockingAI74Time After 4th BlockingAI75Time After 5th BlockingAI76Time After 6th BlockingAI77Time After 7th BlockingAI78Time After 8th BlockingAI79Time After 9th BlockingAI80Time After 10th BlockingAI81Time After 11th BlockingAI82Time After 12th BlockingAI83Time After 13th BlockingAI84Time After 14th BlockingAI85Time After 15th BlockingAI86Time After 16th BlockingAI87Dependent 01 StateAI88Dependent 01 Error CodeAI89Dependent 01 Firing RateAI90Dependent 02 StateAI91Dependent 02 Error CodeAI92Dependent 02 Firing RateAI93Dependent 03 StateAI94Dependent 03 Error CodeAI95Dependent 03 Firing RateAI96Dependent 04 StateAI97Dependent 04 Error CodeAI98Dependent 04 Firing RateAI99Dependent 05 StateAI100Dependent 05 Error CodeAI101Dependent 05 Firing RateAI102Dependent 06 StateAI103Dependent 06 Error CodeAI104Dependent 06 Firing RateAI105Dependent 07 StateAI106Dependent 07 Error CodeAI107Dependent 07 Firing RateAI108Dependent 08 StateAI109Dependent 08 Error CodeAI110Dependent 08 Firing RateAI111Dependent 09 StateAI112Dependent 09 Error CodeAI113Dependent 09 Firing RateAI114Dependent 10 StateAI115Dependent 10 Error CodeAI116Dependent 10 Firing RateAI117Dependent 11 StateAI118Dependent 11 Error CodeAI119Dependent 11 Firing RateAI120Dependent 12 StateAI121Dependent 12 Error CodeAI122Dependent 12 Firing RateAI123Dependent 13 StateAI124Dependent 13 Error CodeAI125Dependent 13 Firing RateAI126Dependent 14 StateAI127Dependent 14 Error CodeAI128Dependent 14 Firing RateAI129Dependent 15 StateAI130Dependent 15 Error CodeAI131Dependent 15 Firing RateAI132CH ModeAI133DHW ModeAI134CH SetpointAI135DHW SetpointAI136Reset Curve Boiler DesignAI137Reset Curve Boiler Mild WeatherAI138Reset Curve Outdoor Mild WeatherAI139Reset Curve Outdoor DesignAI140Warm Weather ShutdownAI141Reset Curve Boiler MaximumAI142Reset Curve Boiler MinimumAI143Night SetbackAV144CH ModeAV145DHW ModeAV146CH SetpointAV147DHW SetpointAV148Reset Curve Boiler DesignAV149Reset Curve Boiler Mild WeatherAV140Reset Curve Outdoor Mild WeatherAV151Reset Curve Outdoor DesignAV152Warm Weather ShutdownAV153Reset Curve Boiler MaximumAV154Reset Curve Boiler MinimumAV155Night Setback
Integration notes
- Appendix C.1 of the guide (pages 56-58). Appendix C.2 (D_Platform, SSB800/1000) is already in the library as bosch/ssb-boiler-protonode.
- The guide states 154 points for the C_Platform profile.
- The table gives no units, ranges or state texts.
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 Buderus Cascade SSB 255 / 399 / 512 (ProtoAir FPA-W44, C_Platform) 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 Bosch Buderus Cascade SSB 255 / 399 / 512 (ProtoAir FPA-W44, C_Platform)
How many BACnet points does the Bosch Buderus Cascade SSB 255 / 399 / 512 (ProtoAir FPA-W44, C_Platform) have?
This list has 154 BACnet objects: 140 analog inputs, 14 analog values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Bosch Buderus Cascade SSB 255 / 399 / 512 (ProtoAir FPA-W44, C_Platform) BACnet points are writable?
14 of the 154 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 Bosch Buderus Cascade SSB 255 / 399 / 512 (ProtoAir FPA-W44, C_Platform) BACnet documentation?
The source is ProtoAir FPA-W44 Start-up Guide for Bosch, Appendix C.1 C_Platform Modbus RTU Mappings to BACnet (Document Revision 5.D), revision 2020-03, published free by Bosch at https://www.bosch-homecomfort.com/us/media/country_pool/service/technical_guides/protoair_fpa-w44_start-up_guide_03.2020.pdf.
What are the minimum BACnet points to integrate the Bosch Buderus Cascade SSB 255 / 399 / 512 (ProtoAir FPA-W44, C_Platform)?
Start with AV 144 CH Mode (Central heating mode command); AV 146 CH Setpoint (Central heating setpoint); AV 2 Control Register (Control register; see the boiler Modbus manual); AI 3 State (Boiler state code); AI 4 Status (Boiler status code); AI 9 Supply Temperature (Supply water temperature); AI 15 Firing Rate (Firing rate); AI 87 Dependent 01 State (Dependent 01 state (repeat for 02-15)); AI 5 Error Code (Active error code).
How do I enable BMS control of the Bosch Buderus Cascade SSB 255 / 399 / 512 (ProtoAir FPA-W44, C_Platform)?
AV 144-155 are the writable mode, setpoint, reset-curve and night setback values (their read-back copies are AI 132-143). AV 2 Control Register is writable too; the guide does not say how it is used.
How do I check these points on the real Buderus Cascade SSB 255 / 399 / 512 (ProtoAir FPA-W44, C_Platform)?
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 Bosch BACnet points lists
- Condensing boiler gateway
Bosch Buderus SSB800 / SSB1000 / SSB1000TL boiler (ProtoNode FPC-N38)
Bosch Buderus SSB800, SSB1000 and SSB1000TL condensing boilers (D_Platform control) connected through a ProtoNode FPC-N38 gateway.
Also known as: SSB800, SSB1000, SSB1000TL, Buderus SSB, Bosch SSB, ProtoNode FPC-N38, D_Platform - Water-source heat pump controller
Bosch Control Air 5600 - Water to Air (WAZ software)
Bosch water-to-air (water source) heat pumps fitted with the Control Air 5600 DDC controller running WAZ zone software.
Also known as: Control Air 5600, WAZ 1.03, Bosch WSHP DDC, Bosch water source heat pump BACnet, Bosch TT Water to Air - Water-to-water heat pump controller
Bosch Control Air 5600 - Water to Water (WWZ software)
Bosch water-to-water heat pumps fitted with the Control Air 5600 DDC controller running WWZ software.
Also known as: Control Air 5600, WWZ 1.03, Bosch water to water heat pump BACnet, Bosch TT Water to Water - Commercial water-source heat pump controller
Bosch Control Air 6120 - Water to Air (WAF software)
Bosch commercial water-to-air heat pumps (up to 4 compressor stages) with the Control Air 6120 DDC controller and WAF software.
Also known as: Control Air 6120, WAF 1.01, Bosch commercial WSHP DDC, Bosch TT Water to Air - Water source heat pump controller
Bosch FHP / Bosch ES 2-stage single-compressor water-to-air DDC (software 3.10)
Discontinued FHP / Bosch ES-series two-stage, single-compressor water-to-air heat pumps with the factory DDC controller running software 3.10.
Also known as: FHP ES, Florida Heat Pump ES BACnet, Bosch ES water source heat pump, FHP BACview 3.10, Integration Points List v3.10 - Boiler plant (multi-boiler) controller
Bosch Heatronic 4000 boiler plant control
Bosch Heatronic 4000 control that runs up to four boilers for heating and DHW loads (product now discontinued).
Also known as: Heatronic 4000, Bosch 4000, Heatronic, J1229A
Source: ProtoAir FPA-W44 Start-up Guide for Bosch, Appendix C.1 C_Platform Modbus RTU Mappings to BACnet · Document Revision 5.D · rev. 2020-03. Object names, instances and units are reproduced as published; descriptions are our own.