Description
Alstom CAN232.1 029.217856 CAN Master Module
Product Introduction
Communication hardware in a legacy VME control cabinet is not interchangeable simply because another board uses the same backplane. The Alstom CAN232.1 029.217856 is identified as a Central Unit with four CAN Master interfaces, using a VME A24/D16,D8 architecture. This places the module in the communication/interface layer of the Alstom 232 control platform rather than among conventional field I/O cards.
Available industrial references also associate 029.217856 with the description COMMUNICATION CANBUS CAN 232.1. One listing records the alternate number format 629.217856 = 029.217856. Detailed electrical ratings, CAN baud-rate limits, isolation characteristics, and environmental specifications for this exact assembly are not sufficiently documented in the sources reviewed, so those values should be verified against the original Alstom documentation.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Alstom |
| Product Model | CAN232.1 |
| Exact Part Number | 029.217856 |
| Alternate Number Format | 629.217856 reported in one industrial reference |
| Product Type | CAN communication / central unit |
| Primary Function | CAN bus master communication |
| CAN Interfaces | 4 × CAN Master |
| VME Interface | VME A24/D16,D8 |
| System Family | Alstom 232 |
| Communication Bus | CAN / CANbus |
| CAN Baud Rate | Not independently verified |
| CAN Isolation | Not independently verified |
| Working Voltage | Not independently verified |
| Operating Temperature | Not independently verified |
| Installation | VME-based Alstom 232 system; verify rack position |
| Protection Rating | Not independently verified |
| Revision | Verify on actual board |
| Condition | Verify actual inventory condition |
The 4 × CAN Master and VME A24/D16,D8 identification is explicitly reported in industrial parts references. The same sources identify CAN232.1 as a central unit rather than a generic CAN adapter.
Major Features / Advantages
Four CAN Master Interfaces
The defining feature of the CAN232.1 is its four CAN Master interfaces. This distinguishes it from a single-channel CAN interface and indicates that the board was designed to provide multiple CAN communication channels within the Alstom 232 control architecture.
For maintenance engineers, this channel count matters because the board’s replacement must preserve the communication topology expected by the installed system. A single-channel CAN interface is not an equivalent substitute simply because the underlying field bus is also CAN.
CAN232.1 029.217856
VME A24/D16,D8 Architecture
The exact CAN232.1 reference is listed with VME A24/D16,D8. This identifies the module as part of a VME-based control architecture and is an important compatibility characteristic when checking the host rack and associated controller hardware.
The VME designation should not be interpreted as proof that any mechanically compatible VME card can replace it. The .1’s specific bus role, software expectations, and four-channel CAN architecture remain relevant.
Dedicated CANbus Communication Role
An industrial parts reference specifically describes 029.217856 as COMMUNICATION CANBUS CAN 232.1, reinforcing its role as a CAN communication assembly within the Alstom equipment family.
This makes the module relevant for maintaining legacy systems where CAN-connected devices remain part of the operating control architecture. In such installations, loss of CAN communication can appear as a downstream device failure even when the actual problem is located at the central communication module.
Exact Part-Number Traceability
The exact identification should be recorded as:
.1 — 029.217856
One available reference also records 629.217856 = 029.217856, so receiving inspection should compare the physical marking rather than rejecting a board solely because of formatting differences.
At the same time, an alternate number should never be assumed to represent a different hardware revision without documentation.
Integration With the 232 Platform
The .1 appears alongside other Alstom 232-series processing, I/O, conversion, drive-control, and configuration-management modules. This makes it useful when reconstructing the communication structure of an older Alstom control cabinet. The surrounding modules should still be mapped from the actual equipment drawings before replacement.
Application Scenarios & Pain Points
- CAN network maintenance: Replacement of a .1 where communication faults have been traced toward the central CAN interface.
- Legacy Alstom 232 systems: Continued support of installed VME-based control equipment.
- Multi-channel CAN architectures: Applications requiring the four CAN Master interfaces documented for the module.
- Planned shutdown preparation: Holding an identified communication-module spare before maintenance on an older control cabinet.
- Control-system troubleshooting: Investigation of multiple CAN-connected devices becoming unavailable at the same time.
A useful field diagnostic clue is the scope of the failure. If several CAN-connected devices disappear simultaneously, check the common communication hardware and its VME/system integration before replacing individual field devices. That is a troubleshooting approach, not proof that the .1 itself has failed.
Related Products
- Alstom VCM232.2 — 029.359 088: VME Configuration Manager Master Module; system-management role rather than CAN interface.
- Alstom VCS232 — 590.043158: VME Configuration Manager Slave reference.
- Alstom COP232.1 — 029.210 156: Central Unit VME A32/D32 reference.
- Alstom COP232.2 — 029.232 446: Central Unit VME A32/D32 reference.
- Alstom SRE232.1 — 029.228 675: Drive Control Module.
- Alstom DIZ232.1 — 029.223 004: Counter / counting input module.
- Alstom BIO232.1 — 029.209 132: Binary input/output module.
- Alstom DAP232 — 590.043150: Unit Processor reference.
- Alstom DEP232 — 590.043152: Digital input module reference.
These are related 232-family components, not automatic replacement options. The .1’s communication function and four-CAN architecture must be preserved when evaluating alternatives.
Engineer’s Guide: Field Pitfalls to Avoid
1. Do not confuse .1 with a generic CAN interface
The documented unit is a central VME unit with four CAN Master interfaces. A generic CAN adapter may not provide the same VME integration or system-level function.
2. Verify the complete part number
Use:
Alstom .1 — 029.217856
An industrial reference also shows 629.217856 = 029.217856. If the physical board uses the alternate format, document it rather than assuming the unit is a different model.
3. Check the four CAN channels
Do not assume all CAN channels are interchangeable or identically configured. Record the original cable assignment and channel mapping before removing the existing module.
4. Verify the VME architecture
The exact listing specifies VME A24/D16,D8. Confirm the host rack and backplane configuration before installation. Mechanical fit alone is not sufficient evidence of system compatibility.
5. Do not invent CAN specifications
The sources reviewed establish CANbus communication and four CAN Master interfaces, but do not adequately establish the exact CAN baud-rate range, termination requirements, isolation, connector pinout, or maximum bus length for this exact board. Those details should come from the original engineering documentation.
6. Preserve configuration information
Before replacing a working .1, document channel assignments, connected devices, rack position, configuration data, and any available diagnostic information. This is particularly important when the replacement is being installed after an intermittent communication fault.
7. Inspect actual inventory condition
For legacy VME electronics, inspect the PCB, connectors, edge contacts, corrosion, component damage, modification marks, and identification labels. If the unit is used or refurbished, request available functional-test information.
FAQ
What is Alstom .1 029.217856?
It is an Alstom .1 central communication unit identified with part number 029.217856. Industrial references specify 4 × CAN Master interfaces and a VME A24/D16,D8 architecture.
How many CAN interfaces does .1 have?
Available references specify four CAN Master interfaces.
What VME interface does the .1 use?
The exact industrial listing identifies the module as VME A24/D16,D8.
Is 029.217856 the same as 629.217856?
One industrial parts reference explicitly records 629.217856 = 029.217856. When receiving the part, compare the actual board markings and supporting documentation rather than relying solely on formatting.
Is .1 interchangeable with another Alstom 232 communication module?
No interchangeability should be assumed. The .1 is specifically identified as a four-CAN Master VME unit. Other 232 modules have different functions and bus roles.
Can the CAN baud rate and electrical specifications be confirmed?
Not reliably from the public sources reviewed for the exact 029.217856 assembly. The CAN communication function and four-master architecture are supported, but detailed baud-rate, isolation, termination, voltage, and environmental specifications should be verified from controlled Alstom documentation.
What should procurement request?
Specify Alstom .1 / 029.217856, request photographs of the actual board and identification label, confirm the number of CAN interfaces, and request available functional-test information for used or refurbished hardware. Also record the rack position and channel configuration of the original module before replacement.
