If you are asking if OPC can be used to implement a safety shutdown system, the answer is no.
If you are asking if OPC can implement safe shutdowns of a system, if certain conditions exist, the answer is yes.
OPC does not directly specify any type of shutdown mechanism or requirements of a client/server to provide this type of functionality. OPC servers and clients can exchange messages that contain shutdown commands.These commands can be interpreted and
implemented by the control logic running in the software and hardware control devices that are connected to OPC.
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OPC - Can OPC implement safe shutdowns?