Omron SYSMAC CS Series Operation Manual page 320

Examples
11-b) Auxiliary Area Settings
282
Check Input Wiring
Activate input devices such as sensors and switches and verify that the corre-
sponding indicators on the Input Units light. Also, use the Bit/Word Monitor
operation in the Programming Device to verify the operation of the corre-
sponding input bits.
Make any required Auxiliary Area settings, such as the ones shown below.
These settings can be made from a Programming Device (including a Pro-
gramming Console) or instructions in the program.
IOM Hold Bit (A50012)
Turning ON the IOM Hold Bit protects the contents of I/O memory (the CIO
Area, Work Area, Timer Completion Flags and PVs, Index Registers, and
Data Registers) that would otherwise be cleared when the operating mode is
switched from PROGRAM mode to RUN/MONITOR mode or vice-versa.
IOM Hold Bit Status at Startup
When the IOM Hold Bit has been turned ON and the PLC Setup is set to pro-
tect the status of the IOM Hold Bit at startup (PLC Setup address 80 bit 15
turned ON), the contents of I/O memory that would otherwise be cleared will
be retained when the PLC is turned ON.
Input Unit
Retained
I/O
memory
Operating mode changed
Retained
I/O
memory
PLC turned ON.
Section 4-2
Force-reset