Omron CP1E-ED

6 Troubleshooting
6-8
CP1E CPU Unit Hardware User’s Manual(W479)
 Reference
An I/O bus error has occurred in data transfer between the CPU Units and Units connected to the I/O
bus.
Cycle the power supply. If operation is not restored when the power supply has been cycled, turn OFF
the power supply and check that connections are proper and that there is no damage.
 Reference
The number of CP-series Expansion Units and Expansion I/O Units connected exceeds the restriction
for the number of Units or words for the system configuration.
Turn OFF the power supply and reconfigure the system within the restrictions.
Memory Errors
Cause Remedy
An error has occurred in memory.
One or more bits in A403 will turn ON to indicate where the
error has occurred.
See below for details.
• Memory Error Location
See below.
A403.00 is ON A checksum error has occurred in the
ladder program. The power supply was
turned OFF when backing up the user
program to backup memory.
Transfer the ladder program again.
A403.04 is ON A checksum error has occurred in the
PLC Setup.
Transfer the PLC Setup again.
Error flag Memory Error Flag, A401.15
Error code (A400) 80F1
Error information Memory Error Location, A403
I/O Bus Error
Cause Remedy
An error occurred in data transfer
between the CPU Unit and an Expansion
Unit or Expansion I/O Unit.
(A value of 0A0A hex will be stored in
A404.)
• Cycle the power supply.
• If the problem persists, turn OFF the power supply and check the
Connecting Cables between the Units to see if they are connected
properly.
• Check the Unit connections to be sure they are ok (e.g., that there
is no damage).
• After correcting the problem, turn ON the power to the Units again.
Error flag I/O Bus Error Flag, A401.14
Error code (A400) 80CA
Error information I/O Bus Error Details, A404
Too Many I/O Points Error
Cause Remedy
The number of CP-series Expansion Units and
Expansion I/O Units exceeds the restriction.
(A value of 4000 hex will be stored in A407.)
Connect a maximum of three Expansion Units or Expan-
sion I/O Units to a CPU Unit with 30 or 40 I/O points.