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1/2-slot addressing

A mode of addressing I/O in which each ½ I/O module slot of an I/O chassis is addressed as an I/O group. Each I/O module slot contains 2 I/O groups.

1-slot addressing

A mode of addressing I/O in which each I/O module slot of an I/O chassis is addressed as an I/O group. Each I/O module slot contains a single I/O group. 16-bit I/O module An I/O module that uses 16 bits (1 word or 2 bytes) of input and/or output image area.

2-slot addressing

A mode of addressing I/O in which each even/odd pair of I/O module slots of an I/O chassis is addressed as an I/O group. Each I/O module slot contains ½ of an I/O group.

32-bit I/O module

An I/O module that uses 32 bits (2 words or 4 bytes) of input and/or output image area.

4-bit I/O module

An I/O module that uses 4 bits (1 nibble) of input and/or output image area.

8-bit I/O module

An I/O module that uses 8 bits (1 byte) of input and/or output image area.