Omron CJ1G/H-CPU series Operation Manual page 237

Examples
10. Testing Operation
10-a) I/O Wiring Checks
10-b) Auxiliary Area Settings
204
Before performing a Trial Operation in MONITOR mode, check the I/O wiring.
Check Output Wiring
With the PLC in PROGRAM mode, force-set and force-reset output bits and
verify that the corresponding outputs operate properly.
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 the CX-Programmer) 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.
Operating mode changed
Input Unit
Retained
I/O
memory
Section 4-2
Force-reset