Omron CX-PROGRAMMER V9 Operation Manual page 154

OMRON
Symbol List of Symbols in Error
Definition
Description of Error
It is now possible to edit the Symbol entries to correct the errors. The new corrections will appear in the 'New ?'
column or to mark them for deletion.
Selecting OK will commit the Symbols, with changes, to the Symbol Table for checking and inserting. Selecting
Cancel will delete all the symbols in the error.
Removing Symbols
Symbols may be removed by deleting them from the symbol table.
Generally, when a symbol is removed, the program and programs using it then use the address or value of the
removed symbol.
The exception is for symbols with automatically allocated addresses – in these cases, the program shows the
name of the removed symbol in the places where it was used. It is then easy to see where an address needs to be
assigned in the program.
If the removed symbol was an override of a global symbol, then the program uses the global symbol of the same
name, which may have a different address or value.
Automatic Allocation
Automatic Allocation is a facility that enables symbols to be automatically assigned an address. This is useful
for 'work' type symbols, where the actual address is not important, providing it is unique (i.e. it is not mapped to
input or output hardware). To use this feature, it is necessary to set the memory ranges from which to allocate
these addresses. Each PLC is set separately.
The main features of auto allocation are:
♦
Multiple address allocation areas
♦
Prioritizing address allocation areas
♦
Address allocation of symbols according to type
♦
Consideration of addresses that have already been used
♦
Different Auto allocation areas for each PLC
♦
It is available to both global and local symbols
Setting Up Automatic Allocation
The PLC Automatic Memory Allocation dialog is opened from the toolbar by selecting PLC | Automatic
Allocation.
PART 1: CX-Programmer
CHAPTER 4 – Reference
CX-Programmer _Page 71