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FAQs
Q1: What is the primary function of the SM812?
It is a High Integrity safety module that provides intelligent supervision of the main controller (PM857/PM863/PM867) during non-SIL and SIL1-2 operations. Together with a PM867, it forms a 1oo2 diverse architecture certified for SIL3 applications, enabling safety and business-critical control in one controller unit .
Q2: Does the SM812 work independently?
No. The SM812 cannot run independently. It must be paired with a compatible standard CPU module (PM857, PM863, or PM867) to function. It acts as a dedicated safety co-processor that monitors and supervises the main CPU's execution.
Q3: What is the difference between SM812 and SM811?
The SM812 is used with PM857, PM863, and PM867 CPUs for SIL3 applications. The SM811 is the predecessor safety module used with the PM865 CPU. Both provide SIL3 certification, but they are designed for different CPU generations.
Q4: Does the SM812 support redundancy?
Yes. The SM812 supports redundant configurations, allowing two SM812 modules to work with two redundant CPUs for high-availability applications. A dedicated SM Link synchronization cable enables hot-insert and online upgrade without system interruption. The switchover time in redundant configuration is maximum 10 ms .
Q5: What software is required for SIL3 applications?
SIL3 functionality requires SIL-certified software and configuration according to the Safety Manual. The module is configured using ABB Control Builder M within the 800xA engineering environment. Only SIL-marked library elements can be used in SIL applications.
