Omron SYSMAC CPM2B Operation Manual page 62

I/O Connector and Terminal Pin Allocation
CPM2B-64EDT 64-point Expansion I/O Boards
Transistor outputs
Transistor outputs (sinking)
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Inputs (24 V DC)
IR m+2
("m" is the last input word allocated to the CPU Board
or Expansion I/O Board already connected.)
IR n+1
("n" is the last input word allocated to the CPU Board or
Expansion I/O Board already connected.)
IR m+1
IR n+2
Section 2-3