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Communications Adapter Register Mapping

Width: 178 mm

Height: 216 mm

2.2.2 Data Register Mapping for Analog I/O bases

Data in controller registers is mapped to the field terminals of analog I/O bases in

the following way:

H Each analog value is mapped to one word.

H The Most Significant Word (MSW) is sent or received first.

H The words sent by the communications adapter to the I/O base represent the

output values and parameters (Output–words).

H The words sent from the I/O base to the communications adapter represent

the input values and status (Input–words).

Data mapping for one analog I/O base is shown as an example:

Figure 4 I/O Mapping of the 170 AAI 140 00 (16 Input Channels) e.g.

Input Data from 170 AAI 140 00

MSW = Word 16

Word 15

Word 5

Value channel 16

Value channel 15

Value channel 5

Word 4

Word 3

Word 2

LSW = Word 1

Value channel 4

Value channel 3

Value channel 2

Value channel 1

Output Data to 170 AAI 140 00

MSW = Word 16

Word 15

Word 5

empty

Word 4

Word 3

Word 2

LSW = Word 1

Parameters, Channels 5 ... 8

Parameters, Channels 1 .. 4

Parameters, Channels 13 ... 16

Parameters, Channels 9 ... 12

to to

Additional documentation: Refer to the I/O bases User Manual (870 USE 002

00) for further information.

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