Startup Settings And Maintenance; Holding Settings For Operating Mode Changes And At Startup - Omron CJ2 - 02-2010 User Manual

10 CPU Unit Functions

10-3 Startup Settings and Maintenance

10-3-1 Holding Settings for Operating Mode Changes and at Startup

Operating Mode Changes
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.
PROGRAM
MONITOR or RUN
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.
MONITOR or RUN
Retained
PROGRAM
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.
Auxiliary Area Flags and Words
Name
IOM Hold Bit
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.)
10-22
I/O memory
Retained
CIO Area and
other areas
I/O memory
CIO Area and
other areas
Address
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.
Description
CJ2 CPU Unit Software User's Manual