CJ2 CPU Unit Software User's Manual - CIP ETI

6 I/O Memory Areas6-11 Auxiliary AreaThe Auxiliary Area addresses range from A0 to A1471 and A1000 to A11535 for words, and A0.00 toA1471.15 and A1000.00 to A11535.15 for bits. These words are preassigned as flags and control bitsto monitor and control operation.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.(For information the functions of Auxiliary Area bits and words, refer to the A-3 Auxiliary Area.)A0 through A447 and A10000 through A11535 are read-only, but A448 through A1471 can be read orwritten from the program or the CX-Programmer.A960 to A1471 and A10000 to A11535 were added to expand the Auxiliary Area in CJ2 CPU Units.These words cannot be accessed by CPU Bus Units, Special I/O Units, PTs, and Support Software thatdo not specifically support the CJ2 CPU Units.Only the following CPU Bus Units and Special I/O Units specifically support the CJ2 CPU Units.• EtherNet/IP Unit: CJ1W-EIP21• Position Control Units: CJ1W-NC214, CJ1W-NC234, CJ1W-NC281, CJ1W-NC414,CJ1W-NC434, CJ1W-NC481, and CJ1W-NC881• Analog Input Unit: CJ1W-AD042• Analog Output Unit: CJ1W-DA042V• Serial Communications Units: CJ1W-SCU22, CJ1W-SCU32, and CJ1W-SCU42Word A0Bit 15 0BitWord A1000015 0Read-onlyareaA447A448Read-onlyareaRead/writeareaA1471A11535The following operations can be performed from the CX-Programmer to write data in the Auxiliary Area:Changing present values when monitoring programming addresses (set values dialog box), or transferringdata to the PLC after editing the PLC data tables. Also the online set/reset operation cannot beused for bits in the Auxiliary Area. Refer to the CX-Programmer Operation Manual (Cat. No. W414).Precautions for Correct UseThere is a possibility that a function will be assigned to any undefined Auxiliary Area word or bitin a future upgrade of the CPU Unit. Do not use undefined words or bits in the Auxiliary Area aswork words or bits in the user program.6-22 CJ2 CPU Unit Software User’s Manual