Omron SYSMAC CS Series Operation Manual page 594

Error Processing
11-2-5 Error Messages
!Caution Always check the safety of the controlled system before turning the power
CPU Errors
Status Error Program-
Console
display
Stopped CPU error – – – –
CPU Reset
Status Error Program-
Console
display
Stopped CPU reset – – – –
556
The following tables show error messages for errors which can occur in CS-
series PLCs and indicate the likely cause of the errors.
supply OFF or ON.
A CPU error has occurred if the indicators have the following conditions in
RUN or MONITOR mode. A Programming Device, such as a Programming
Console, cannot be connected when the CPU Unit is in this state.
Power Supply
Unit Indicator
POWER
ON
Error Error
ming flags in code (in
Auxiliary A400)
Area
None None
The following indicators status indicates an Expansion Rack power interrup-
tion, not a CPU error. A Programming Device, such as a Programming Con-
sole, cannot be connected when the CPU Unit is in this state.
Power Supply
Unit Indicator
POWER
ON
Error Error
ming flags in code (in
Auxiliary A400)
Area
None None
Note When power supply is interrupted to an Expansion Rack, the CPU Unit will
stop program execution and the same operations as are performed when the
power supply to the CPU Unit is interrupted will be performed. For example, if
the power OFF interrupt task is enabled, it will be executed. If power is then
CPU Unit Indicators
RUN ERR/ALM
--- ON
Flags Probable cause
and
word
data
None Watchdog timer has
exceeded maxi-
mum setting.
CPU Unit Indicators
RUN ERR/ALM
OFF OFF
Flags Probable cause
None Power is not being
supplied to an
Expansion Rack.
An I/O Connecting
Cable is not con-
nected properly.
For example, the IN
and OUT connec-
tions between the
CPU Rack and an
Expansion Rack are
reversed.
Section 11-2
INH PRPHL COMM
--- ---
Possible remedy
Turn the power OFF and
restart. The Unit may be
faulty. Contact your OMRON
representative if the problem
persists.
INH PRPHL COMM
OFF ---
Possible remedy
Supply power to the Expan-
sion Rack.
Turn OFF the power supply,
check the connections all I/O
Connecting Cables, and turn
the power supply back ON.
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