Omron CJ2 CPU UNIT SOFTWARE User Manual

3-11
3 CPU Unit Operation
CJ2 CPU Unit Software User’s Manual
3-2 CPU Unit Operating Modes
3
3-2-3 Changing the Operating Mode
Some parts of I/O memory, such as the CIO Area and Work area, will be cleared when the operating
mode is changed between RUN or MONITOR mode and PROGRAM mode. These are called non-hold-
ing areas. To hold the contents of these areas when the operating mode is changed, turn ON the IOM
Hold Bit (A500.12) in the Auxiliary Area
*1 Memory is cleared on if the IOM Hold Bit is OFF. If it is ON, data will be held as follows:
*2 The IOM Hold Bit (A500.12) will be turned OFF when a power interruption is reset. To retain the status, select
the IOM Hold Bit Check Box in the Startup Hold Settings Tab Page of the PLC Setup using the CX-Program-
mer, and then transfer the PLC Setup.
*3 The Task Flags will be cleared regardless of the status of IOM Hold Bit (A500.12).
Memory Status after Mode Changes and Power Interruptions
Mode change Non-holding areas Holding Areas
• I/O Area
• Data Link Area
• CPU Bus Unit Area
• Special I/O Unit Area
• Work Area
• Timer PV and Completion Flags
• Index Registers
• Data Registers
• Task Flags
(Auxiliary Area bits/words are held or not
held depending on the address.)
• HR Area
•DM Area
•EM Area
• Counter PV and Completion Flags
(Auxiliary Area bits/words are held or not
held depending on the address.)
RUN or MONITOR to
PROGRAM
Cleared
*1
Held
PROGRAM to RUN
or MONITOR
RUN to MONITOR or
MONITOR to RUN
Held Held
Power interruption
reset
*2
Cleared
*3
Held
I/O Memory
Hold Bit sta-
tus (A500.12)
I/O Memory Output bits allocated to Output Units
Mode
changed
between
PROGRAM
and
RUN/MONI-
TOR
Fatal error Mode
changed
between
PROGRAM
and
RUN/MONI-
TOR
Fatal error
Fatal error
other than
FALS
FALS
executed
Fatal error
other than
FALS
FALS
executed
OFF Cleared Cleared Held OFF OFF OFF
ON
Held Held Held Held OFF:
Values in the I/O memory in
the CPU Unit will be held when
a fatal error occurs, but the
outputs from Basic Output
Units will turn OFF.

Omron CJ2 CPU UNIT SOFTWARE Specifications

General

Brand	Omron
Model	CJ2 CPU UNIT SOFTWARE
Category	Software
Language	English