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984 Ladder Logic has a Immediate I/O (IMIO) Instruction which will interrupt the PLC scan and give immediate access to I/O. When the instruction is solved, the IMIO will take information from an input module and place into the State Ram or It can take information from the State Ram and transfer the data to an output module. This happens within the scan compared to a normal solve of read inputs per the segment scheduler and write outputs per the segment scheduler.