10-23
10 CPU Unit Functions
CJ2 CPU Unit Software User’s Manual
10-3 Startup Settings and
Maintenance
10
10-3-1 Holding Settings for Operating Mode Changes and at Startup
In order for all data in I/O memory to be retained when the PLC is turned ON, the IOM Hold Bit
(A500.12) must be ON and it must be protected in the PLC Setup.
z Auxiliary Area Flags and Words
z PLC Setup
When using the CX-Programmer, select the IOM Hold Bit Check Box in the Startup Hold Area on the
Startup Tab Page to make the setting.
PLC Power ON
Name Address Description
IOM Hold Bit A500.12 When this bit is ON, all of I/O memory will be retained when the operat-
ing mode is changed between PROGRAM and RUN/MONITOR or the
power is turned ON.
ON: I/O memory will be retained when the operating mode is changed.
OFF: I/O memory will be cleared when the operating mode is changed.
Retained
Power ON
I/O memory
CIO Area and
other areas
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