BECKHOFF KL6051 - Manual (Page 15)

Annex
KL6051 15
Legend
Complete evaluation: the terminal is mapped with control / status byte.
Motorola format: the Motorola or Intel format can be set.
Word alignment: the terminal is at a word limit in the bus coupler.
CT: Control- Byte (appears in the PI of the outputs).
ST: Status- Byte (appears in the PI of the inputs).
D0 – D4: Data bytes 0 - 4