Description
Key Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | ABB |
| Model | SM811K01 |
| Part Number | 3BSE018173R1 |
| Product Type | Safety CPU Module Kit |
| System Platform | ABB AC 800M / System 800xA High Integrity |
| Safety Certification | IEC 61508 SIL3 |
| Processor | Motorola MPC862P |
| Clock Frequency | 96 MHz |
| RAM | 32 MB |
| CPU Redundancy | Supported |
| Connection | CEX Bus via BC810 Interconnection Unit |
| Kit Contents | SM811 Module, TP868 Baseplate, TK852V10 Synchronization Cable |
| Typical Weight | Approx. 0.6 kg |
| Product Status | Obsolete Spare Part (SM812K01 recommended for new projects) |
Product Introduction
The ABB SM811K01 (3BSE018173R1) is a High Integrity Safety CPU module kit designed for ABB AC 800M controllers within the System 800xA safety platform. It operates as the collaborating safety CPU alongside the PM865 processor and communicates through the CEX bus using the BC810 interconnection unit.
Its SIL3 certification, redundant architecture support, and deterministic safety processing make it suitable for emergency shutdown (ESD), burner management systems (BMS), fire and gas protection, and other critical process safety applications. For new installations, ABB recommends the SM812K01, while the SM811K01 remains an important spare part for existing systems.
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Safety controller will not enter RUN | Safety CPU fault | ✅ High | Check SM811 diagnostic LEDs and controller event log | Replace module only after verifying power and configuration |
| Safety application mismatch | Incorrect firmware or safety project | ✅ High | Compare firmware and safety project checksum | Restore validated safety application |
| Redundant controller synchronization failure | Synchronization cable or SM811 fault | ✅ High | Verify TK852V10 cable and redundancy diagnostics | Replace damaged cable before replacing CPU |
| CEX Bus communication error | BC810 or CEX connection problem | ⚠️ Medium | Inspect CEX bus connectors and status LEDs | Verify BC810 operation and module seating |
| Controller repeatedly restarts | Power supply instability | ❌ Low | Measure 24 V DC supply under load | Confirm stable power before replacing SM811 |
| Safety I/O unavailable | Remote I/O or network issue | ❌ Low | Review CI module diagnostics and fieldbus status | Investigate network before replacing CPU |
Technical Support Note: Capture controller event logs, LED indications, firmware revisions, and safety application versions before replacing the CPU. These records significantly reduce troubleshooting time.
- SM811K01 3BSE018173R1
- SM811K01 3BSE018173R1
Frequently Asked Questions (FAQ)
Q1. Is the SM811K01 intended for new safety system installations?
No. ABB classifies the as a spare part for existing systems. For new High Integrity installations, ABB recommends the SM812K01.
Q2. Can I install this module without a PM865?
No. The SM811 functions as a collaborating Safety CPU alongside the PM865 High Integrity controller. It is not designed to operate as a standalone processor.
Q3. Can I hot-swap the Safety CPU?
No. Shut down the controller before replacing the module. Safety controllers maintain certified operating states, and removing the CPU under power can interrupt safety functions or damage hardware.
Q4. What comes with the kit?
The standard kit includes:
- SM811 Safety Module
- TP868 Baseplate
- TK852V10 Synchronization Link Cable
These components are supplied together as the processor kit.
Q5. Why is New Surplus inventory available if ABB no longer recommends it for new projects?
Many industrial facilities purchased strategic spare parts during plant expansions or modernization projects. These unused OEM parts remain factory original and are commonly supplied as New Surplus for maintenance of installed AC 800M systems.
Q6. What quality inspections should a supplier perform?
Every unit should undergo:
- OEM label and serial number verification
- Visual PCB inspection for corrosion, repairs, or damaged connectors
- Installation on an ABB AC 800M High Integrity test rack
- CEX Bus communication verification
- Redundancy synchronization testing
- Continuous operational burn-in
- Electrical insulation and power verification
- ESD-safe packaging with QC documentation
Test reports, photos, and operational videos should be available upon request.
Q7. What installation mistakes cause the most downtime?
The three issues experienced most often in the field are:
- Firmware revision mismatch. Record both controller firmware and Safety Builder project versions before replacement.
- Synchronization cable installation errors. Always verify the TK852V10 cable and redundancy configuration before powering up.
- ESD damage during handling. These safety CPUs are expensive. Wear a grounded wrist strap and keep the module inside its anti-static bag until installation.
Keep these checks in mind, and you’ll eliminate most unnecessary safety CPU replacements while reducing commissioning time.
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