Rockwell-automation 1738-ADNX ArmorPoint I/O DeviceNet Adapters Manual de usuario descargar pdf (Pagina 45)

Publication 1738-UM001A-EN-P - February 2005

Use Auto Start Mode 3-3

How Is I/O Data Mapped Using Auto Start Mode?

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.

Keep the following in mind when using fixed boundaries:

• You specify fixed map size using EDS parameters

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

beginning with byte 2

• No data area is reserved for MACID 0 (the adapter)

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 133 134

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Rockwell-automation 1738-ADNX ArmorPoint I/O DeviceNet Adapters Manual de usuario Pagina 45