User manual

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
y:
– 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,
In
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.