The ABB SM811 (3BSE018173R1) is a specialized Security CPU module within the AC 800M High Integrity controller family. This model is designed to work in conjunction with a standard PM865 or PM866 processor to create a Safety Instrumented System (SIS). It provides the necessary hardware redundancy and diagnostic monitoring to achieve Safety Integrity Level 3 (SIL3) compliance according to IEC 61508.
Technical Specifications
| Feature | Details |
| Model Number | SM811 / 3BSE018173R1 |
| Revision / Generation | PR:B / G:3 |
| Safety Integrity Level | SIL3 (when paired with HI Processor) |
| Memory | Non-volatile Flash / RAM for Safety Logic |
| Country of Origin | Estonia / Sweden |
| Dimensions (WxHxD) | 119 x 186 x 135 mm |
| Weight | Approx. 1.15 kg |
| Power Dissipation | Max 15 W |
Operational Precautions
- Safety Pairing: The SM811 must be mounted on the same TP830 baseplate as the companion PM865/PM866 processor; the system will not initialize safety functions if the modules are separated.
- Firmware Matching: The firmware version of the SM811 must be strictly compatible with the “High Integrity” version running on the primary CPU and the Control Builder M software.
- Redundancy Link: For redundant safety controllers, ensure the dedicated RCU (Redundancy Control Unit) cables are used to synchronize both the primary and secondary SM811 units.
- Force Overrides: Exercise extreme caution when using “Force” commands in safety logic; SIL3 certification requires strict adherence to administrative bypass procedures.
Common Q&A
Q: Can the SM811 run as a standalone controller? A: No, the SM811 is a “Security” co-processor. It performs safety-related diagnostic checks and logic execution in parallel with a primary AC 800M processor.
Q: What is the difference between PR:B and earlier revisions? A: “PR:B” refers to the hardware product revision. It typically includes updated internal components or manufacturing improvements that enhance long-term reliability compared to the initial “PR:A” release.
Q: Does it support both S800 and S900 I/O? A: Yes, when integrated into a High Integrity controller, it can manage safety-related data from both S800 High Integrity I/O and standard I/O stations via ModuleBus or Profisafe.
Recommended Similar Models
- PM865AK01: The High Integrity processor typically paired with the SM811 for SIL3 applications.
- SM810: An earlier version of the Security CPU module used in older AC 800M systems.
- PM867: A high-performance processor capable of being upgraded to High Integrity status with an SM811.
- TP830: The universal baseplate required for mounting the SM811 and its companion CPU.
- CI854A: PROFIBUS interface used to connect safety-related field devices to the HI controller.
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