Beckhoff BK5200 Manual do Utilizador descarregar pdf (Página 17)

Basic Principles

BK52x0 17

Four groups are distinguished in the assignment:

Functional type of the channel Assignment level

Analog outputs assignment by bytes

Digital outputs assignment by bits

Analog inputs assignment by bytes

Digital inputs assignment by bits

Complex multi-byte signal Bus Terminals are represented as analog inputs

or outputs.

The distribution of the process image in the Bus Coupler in overview:

Output data in the Bus

Coupler

...

byte-oriented data

...

Ox+1

bit-oriented data

Ox+y

Input data in the Bus

Coupler

...

byte-oriented data

...

Ix+1

...

bit-oriented data

...

Ix+y

The path from the I/Os to

the DeviceNet process

image

Data consistency

Data whose content is all correctly associated is said to be consistent.

Examples of data items that belong together are: 1. the high and low bytes

of an analog value (word consistency), and 2. a control/status byte and the

associated parameter word for access to the registers. Data consistency in

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Beckhoff BK5200 Manual do Utilizador Página 17