10 CPU Unit Functions
10-22
CJ2 CPU Unit Software User’s Manual
10-3 Startup Settings and Maintenance
z Starting Program Execution
Turn ON the IOM Hold Bit (A500.12) to retain all data in I/O memory when the CPU Unit is switched
from PROGRAM mode to RUN/MONITOR mode to start program execution.
z Stopping Program Execution
When the IOM Hold Bit (A500.12) is ON, all data in I/O memory will also be retained when the CPU
Unit is switched from RUN/MONITOR mode to PROGRAM mode to stop program execution.
The following areas are held for the IOM Hold Bit: CIO Area (I/O Area, Data Link Area, CPU Bus
Unit Area, Special I/O Unit Area, DeviceNet Area, and Internal I/O Area), Work Area, Timer Comple-
tion Flags, and Timer PVs.
z Auxiliary Area Flags and Words
When the IOM Hold Bit is ON, all outputs from Output Units will be maintained when program execu-
tion stops. When the program starts again, outputs will have the same status that they had before
the program was stopped.
(When the IOM Hold Bit is OFF, instructions will be executed after the outputs have been cleared.)
10-3-1 Holding Settings for Operating Mode Changes and at Startup
Operating Mode Changes
Name Address Description
IOM Hold Bit A500.12 When this bit is ON, all of the I/O memory will be retained when the
operating mode is changed between PROGRAM and RUN/MONITOR
mode 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.
PROGRAM
Retained
I/O memory
CIO Area and
other areas
MONITOR or RUN
PROGRAM
Retained
MONITOR or RUN
I/O memory
CIO Area and
other areas
To Next Page
Loading...
Need help?
General