Omron CS1D DUPLEX SYSTEM - 10-2009 Operation Manual page 181

Basic Procedures
11. Testing Operation
there is a hardware error causing the inconsistency, the error
should be cleared.
Checking I/O Wiring
Before performing a trial operation in MONITOR mode, check the I/O wiring.
Output Wiring
With the PLC in PROGRAM mode, force-set and force-reset output bits and
verify that the corresponding outputs operate properly.
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.
Input Unit
Auxiliary Area Settings
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.
I/O
memor y
Operating mode changed
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
LEFT CPU
RIGHT CPU
DPL SW
ON
INIT.
SW
ON
DUPLEX DUPLEX
LEFT CPU
RIGHT CPU
DPL SW
ON
INIT.
SW
ON
DUPLEX DUPLEX
Retained
Section 4-2
PRO27 PR O27
PROGRAMMING CONSOLE PR OGRAMMING CONSOLE
MONITOR
RUN PROGRAM
FUN SFT NOT
OR
AND CNT TR LR HR
LD OUT DM CH
TIM
Force-reset/
8 9
7 EXT
E
4 F 5 6
B C D
1 2 3
reset
A
0
EAR MIC
145