Rockwell Automation 1734-AENTR EtherNet/IP Network Configuration User Manual - Manual (Page 84)

84 Rockwell Automation Publication ENET-UM001L-EN-P - March 2014
Chapter 6 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 in 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
entry with one of these methods:
– 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 receives the data.
When mapping tags, remember these guidelines:
• Do not use file numbers 0, 1, and 2. These files are reserved for Output,
Input, 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 elements of system structures may produce
undesirable effects.
• Use the PLC file identifier of N or B when accessing elements in an INT
tag array.
This example shows how to use a buffer of INTs.