Rockwell-automation 1734-ADNX POINT I/O DeviceNet Adpater User Manual Manual de usuario descargar pdf (Pagina 47)

Publication 1734-UM002C-EN-P - July 2003

Using Auto Start Mode 3-3

When the Adapter Uses Auto Start Mode, How Does it Map

I/O Data?

In Auto Start Mode, you can map I/O data in the adapter’s memory in

one of the following ways:

• Byte Boundaries

• Word Boundaries

• Double Word Boundaries

• Fixed Boundaries

Byte Boundaries

Each node’s I/O data is mapped in the adapter’s memory at the next

available byte. This option works best in applications that use

Allen-Bradley PLCs and SLCs.

Word Boundaries

Each node’s I/O data is mapped in the adapter’s memory at the next

available word. This option works best in applications that use

Allen-Bradley PLCs and SLCs.

Double Word Boundaries

Each node’s I/O data is mapped in the adapter’s memory at the next

available double word. This option works best in applications that use

Allen-Bradley Logix products.

Fixed Boundaries

The map to the fixed location is based on the node address. Mapping

size ranges from 1 to 32 and is set using an EDS parameter. The

mapping for a node with address 1 begins on byte 2. The formula for

mapping is: 2+((N-1)(mapsize)), where N = node address.

• The user specifies fixed map size using EDS parameters

• Data mapped after status/channel words in I/O image,

beginning with byte 2

• No data area reserved for MAC ID 0 (the adapter)

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Rockwell-automation 1734-ADNX POINT I/O DeviceNet Adpater User Manual Manual de usuario Pagina 47