BECKHOFF KL4112 - Manual (Page 16)

Annex
16 KL4112
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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 - 0 : D0 = Data-Low-Byte, 0 = channel 1
D1 – 1 : D1 = Data-High-Byte, 1 = channel 2