Omron CJ2 CPU UNIT SOFTWARE User Manual page 248

6 I/O Memory Areas
IOM Hold Bit Operation
If the IOM Hold Bit (A500.12) is ON, the Data Registers won't be cleared when a FALS error occurs
or the operating mode is changed from PROGRAM mode to RUN/MONITOR mode or vice-versa.
If the IOM Hold Bit (A500.12) is ON and the IOM Hold Bit Check Box is selected in the Startup Hold
Area on the Startup Tab Page in the PLC Setup, the Data Registers won't be cleared when the
PLC's power supply is cycled.
Sharing Data Registers
The following setting can be made from the PLC Properties Dialog Box in the CX-Programmer to
control sharing index and data registers between tasks.
Additional Information
We recommend setting the PLC properties to share index and data registers between tasks
whenever index and data registers are not used in the program.
6-42 CJ2 CPU Unit Software User's Manual