The I/O map is used to direct the flow of data between the various I/O modules and the logic program. It is the tie between the references used in the logic program and the I/O module connection points.

The 800 series I/O map lets you match the controller I/O addresses with what will be installed or with what actually exists in the field. The I/O map also tells the controller how to use an input signal in user logic, and, where to send an output signal. The format of register data (BCD - binary coded decimal or BIN binary) is specified on this screen. The screen objective is to load the card selections and reference number selections to complete the I/O configuration.