Schneider Electric INTERBUS Basic Uživatelský manuál stáhnout pdf (Strana 20)

Communications Adapter Register Mapping

2.2 Mapping Data Bits to I/O Base Terminals

2.2.1 Data Register Mapping for Discrete I/O bases

The data transmitted to or from the I/O base are transfered 1 : 1 from/to the

communication adapter.

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

the following way:

H Mapping is done by words (max. 2 for 32 I’s or O’s).

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

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

outputs (Output–words).

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

the inputs (Input–words).

Data mapping for two discrete I/O bases is shown as an example:

Figure 3 I/O Mapping of the 170 ADI 350 00 (32 Inputs) and 170 ADO 350 00

(32 Outputs)

Input Data from 170 ADI 350 00

MSW = Word 2

Inputs 17 ... 32

LSW = Word 1

Inputs 1 ... 16

Output Data to 170 ADI 350 00

MSW = Word 2

Outputs 17 ... 32

LSW = Word 1

Outputs 1 ... 16

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

00) for further information.

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 35 36

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Schneider Electric INTERBUS Basic Uživatelský manuál Strana 20