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What is the significance of CPU sync link for Modicon Quantum HSBY processor.

With this link the standby CPU is updated (Program, data transfer from Primary to Standby) after the end of every scan cycle.
 
The %SW61.6 bit correspond to Fiber optic link between the two hot standby CPU’s. When the Bit %SW61.6 is ‘1’ then the
link is not established or its broken/fail.
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