Extended Data Memory Area; Automatic Address Allocation - Omron CJ2 CPU UNIT SOFTWARE User Manual

6 I/O Memory Areas

6-15 Extended Data Memory Area

The EM Area addresses range from E0_0 to E18_32767 for words. The EM Area is divided into 24
banks (0 to 18 hex). The hexadecimal number after "E" in the address indicates the bank.
The EM Area is used for general data storage and manipulation and is accessible by word or bit.
Data in the EM Area is retained when the PLC's power is cycled or the CPU Unit operating mode is
changed from PROGRAM mode to RUN/MONITOR mode or vice-versa.
In addition to a general data area, settings can be made to use the EM Area for automatic address
allocation, trace memory, and file memory.
Banks D to 18 hex of the EM Area (E0D_0 to E18_32767) were added to expand the EM Area in
CJ2 CPU Units. These banks cannot be accessed by CPU Bus Units, Special I/O Units, PTs, and
Support Software that do 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:
• Position Control Units:
• Analog Input Unit:
• Analog Output Unit:
• Serial Communications Units:

Automatic Address Allocation

We recommend that you use the EM Area to automatically allocate addresses to symbols. With
CJ2H CPU Units, you can force-set/reset bits in the following EM Area banks if you use automatic
address allocation for them.
CJ2H-CPU64(-EIP)
CJ2H-CPU65(-EIP)
CJ2H-CPU66(-EIP)
CJ2H-CPU67(-EIP)
CJ2H-CPU68(-EIP)
Refer to 5-5-8 Automatic Address Allocation to Symbols for the procedure to use automatic address
allocation.
Additional Information
Bits in all EM Area banks can be force-set or force-reset for CPU Units with unit version 1.2 or
later.
With the CJ2M CPU Units, force-setting/resetting bits in the EM Area is possible only for banks
specified for the EM Area force-set/reset function without using automatic address allocation.
CJ2M-CPU@1
CJ2M-CPU@2
CJ2M-CPU@3
CJ2M-CPU@4
CJ2M-CPU@5
6-28
CJ1W-EIP21
CJ1W-NC214, CJ1W-NC234, CJ1W-NC281, CJ1W-NC414,
CJ1W-NC434, CJ1W-NC481, and CJ1W-NC881
CJ1W-AD042
CJ1W-DA042V
CJ1W-SCU22, CJ1W-SCU32, and CJ1W-SCU42
Model
Models
Words in which bits can be force-set/reset when
using automatic address allocation
E03_0 to E03_32767
E06_0 to E09_32767
E07_0 to E0E_32767
E11_0 to E18_32767
Force-set/reset enabled banks
E0
E0 to E3
CJ2 CPU Unit Software User's Manual