Omron CJ2 - 02-2010 User Manual page 228

6 I/O Memory Areas
Special I/O Units (D20000 to D29599)
Each Special I/O Unit is allocated 100 words (based on unit numbers 0 to 95). Refer to the Unit's
operation manual for details on the function of these words.
DM Area for Special I/O Units
(100 words/Unit)
CPU Bus Units (D30000 to D31599)
Each CPU Bus Unit is allocated 100 words (based on unit numbers 0 to F). Refer to the Unit's oper-
ation manual for details on the function of these words. With some CPU Bus Units, such as Ethernet
Units, initial settings must also be registered in the CPU Unit's Parameter Area; this data can be reg-
istered with a Programming Device.
DM Area for CPU Bus Units (100
words/Unit)
6-26
Special I/O Unit
CPU Unit
Data trans-
ferred to the
Special I/O
Unit when the
PLC is turned
ON or the Unit
is restarted.
Data trans-
ferred to the
CPU Unit at
cyclic refresh-
ing or when
necessary.
CPU Bus Unit
CPU Unit
Data trans-
ferred to the
Unit when the
PLC is turned
ON or the
Unit is
restarted.
Data trans-
ferred to the
CPU Unit at
cyclic refresh-
ing or when
necessary.
CJ2 CPU Unit Software User's Manual