Hot Start/Hot Stop Functions - Omron CJ - PROGRAMMING MANUAL 08-2008 Programming Manual

Startup Settings and Maintenance
6-6-1

Hot Start/Hot Stop Functions

Operating Mode Change
PLC Power ON
322
• Remote Programming and Monitoring
• Flash Memory
• Setting Startup Conditions
Hot Start
Turn ON the IOM Hold Bit (A50012) 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.
Hot Stop
When the IOM Hold Bit (A50012) is ON, all data* in I/O memory will also be
retained when the CPU Unit is switched from RUN/MONITOR mode to PRO-
GRAM mode to stop program execution.
Note *The following areas of I/O memory will be cleared during mode changes
(PROGRAM ↔ RUN/MONITOR) unless the IOM Hold Bit is ON: the CIO Area
(I/O Area, Data Link Area, CPU Bus Unit Area, Special I/O Unit Area, Inner
Board Area, SYSMAC BUS Area, I/O Terminal Area, DeviceNet (CompoBus/
D) Area, and Internal I/O Areas), Work Area, Timer Completion Flags, and
Timer PVs. (The Inner Board, SYSMAC BUS, and I/O Terminal Areas are
supported by CS-series CPU Units only.)
Auxiliary Area Flags and Words
Name Address
IOM Hold Bit A50012
When the IOM Hold Bit is ON, all outputs from Output Units will be maintained
when program execution 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.)
In order for all data* in I/O memory to be retained when the PLC is turned on
(OFF → ON), the IOM Hold Bit must be ON and it must be protected in the
PLC Setup (address 80, IOM Hold Bit Status at Startup).
PROGRAM
Retain
MONITOR or RUN
MONITOR or RUN
Retain
PROGRAM
When this bit is ON, all of I/O memory will be retained
when the operating mode is changed (PROGRAM ↔
RUN/MONITOR).
Retain
Power ON
Section 6-6
I/O memory
CIO and
other areas
I/O memory
CIO and
other areas
Description
I/O memory
CIO and
other areas