Allen-Bradley Rockwell Automation 1734-AENT Manual de usuario descargar pdf (Pagina 116)

116 Publication ENET-UM001I-EN-P - January 2010

Chapter 7 Interlocking and Data Transfer Between Controllers

Mapping Tags

A Logix5000 controller stores tag names on the controller so that other

devices can read or write data without having to know physical memory

locations. Many products only understand PLC/SLC data tables, so the

Logix5000 controller offers a PLC/SLC mapping function that enables you to

map Logix tag names to memory locations.

• You have to map only the file numbers that are used i

n messages; the

other file numbers do not need to be mapped.

• The mapping table is loaded into the

controller and is used whenever a

logical address accesses data.

• You can access only controller-scoped tags (global data).

• For each file that is referenced in a PLC-5 or SLC command, make a

map entr

y b

– typing the PLC/SLC file number

of the logical address.

– typing or selecting the

Logix5000 controller-scoped (global) tag that

supplies or receives data for the file number. (You can map multiple

files to the same tag.)

· For PLC-2 commands, specify the tag that supplies or recei

ves the data.

When mapping tags:

• do not use file numbers 0, 1, and 2. These files are reserved for Output,

put, and Status files in a PLC-5 processor.

• use PLC-5 mapping only for tag arrays of data type INT, DINT, or

REAL. Attempting to map eleme

nts of system structures may produce

undesirable effects.

• use the PLC file identifier of N or B when accessing elements in an INT

tag ar

ray.

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Allen-Bradley Rockwell Automation 1734-AENT Manual de usuario Pagina 116