Omron CJ2 User Manual page 179

I/O Bus Error (Fatal Error)
An I/O bus error will occur if there is an error in a data transfer between the CPU Unit and a Unit con-
nected in the Rack.
POWER
Lit. Not lit.
*1 The numbers of the slot and Rack where the I/O bus error was detected are stored in word A404.
15
A404
Recovery Processing Flow
I/O bus error occurs.
Check the error
status.
Restart the PLC
Is the error cleared?
Restart the System.
CJ2 CPU Unit Hardware User's Manual
RUN ERR/ALM
Lit.
08 07
Check the error code and error information.
Turn the power OFF and back ON.
No
Yes
Check the I/O Connecting
Cable connections between
all Racks.
Check the Unit installation.
Yes
Replace the Unit or the
Connecting Cable.
CX-Program-
Error flag
mer display
I/O Bus Error A401.14
01
The number of the slot where the error occurred in
binary. (If it cannot be determined, "0F" will be stored.)
The number of the Rack where the error occurred in
binary (If it cannot be determined, "0F" will be stored.)
Restart the PLC.
Is the error cleared?
No
Restart the PLC.
6 Troubleshooting
Error infor-
Error code
mation
80C0 to 80C7 *1
A404
or 80CF
6-13
6