Regarding fiber optic issues
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In the same cabinet room, there are DCS and SIS systems. If both DCS and SIS are to be connected to the control room via optical fibers, can they share the same fiber, or must separate fibers be used? Are there any relevant specifications for this?
Multi-core optical cables can be used, but for safety reasons it is best to lay them separately
For the safety of the system, they should be laid separately.
It seems best to lay them separately, for safety reasons
OP, using two separate optical fibers is a form of communication redundancy aimed at improving reliability; it serves the same purpose as hot standby