6-9
6 Troubleshooting
CP1E CPU Unit Hardware User’s Manual(W479)
6-1 Troubleshooting CPU Unit Errors
6
6-1-8 Fatal Errors
z 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.
z 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.
z Reference
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.)
• Try cycling 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
Expansion I/O Units to a CPU Unit with 30 or 40 I/O
points.
Error flag
Too Many I/O Points Flag, A401.11
Error code (A400)
80E1
Error information
Too Many I/O Points Details, A407
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