5 I/O Memory
5-24
CP2E CPU Unit Software User’s Manual(W614)
Applications of the bits and words in the Auxiliary Area are predefined. Ladder programs can be simpli-
fied and controllability can be improved by effectively using the bits and words in this area.
• Some words or bits are set automatically by the system and others are set and manipulated by the
user.
The Auxiliary Area includes error flags set by self-diagnosis, initial settings, control bits, and status
data.
• Words and bits in this area can be read and written from the program or the CX-Programmer.
• The Auxiliary Area contains words that are read-only (A0 to A447) and words that can be read and
written (A448 to A959).
• Even the read/write bits in the Auxiliary Area cannot be force-set and force-reset continuously.
z Auxiliary Area Words and Bits in the CX-Programmer’s System-defined
Symbols
The following table gives the Auxiliary Area bits and words pre-registered in the CX-Programmer’s
global symbol table as system-defined symbols.
Refer to A-2 Auxiliary Area Allocations by Address for details.
Applications
Details
Word/Bit Name Name in CX-Programmer
A200.11 First Cycle Flag P_First_Cycle
A200.12 Step Flag P_Step
A200.15 First Cycle Task Flag P_First_Cycle_Task
A262 Maximum Cycle Time P_Max_Cycle_Time
A264 Present Cycle Time P_Cycle_Time_Value
A401.08 Cycle Time Too Long Flag P_Cycle_Time_Error
A402.04 Battery Error Flag P_Low_Battery
A500.15 Output OFF Bit P_Output_Off_Bit
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