Troubleshooting - Omron SYSMAC C200H-DA002 Operation Manual

Troubleshooting

2-5

Troubleshooting

Error Detection
Unit error
• Causes of error
Disconnection error
• Disconnect indications
• Causes of error
Limit warning
• Limit warning indications
RUN indicator not lit The RUN indicator on the Unit is not lit even though
power is turned on to the PC, and none of the errors
described in this table have occurred.
CPU error
• The Special I/O Unit is defective.
CPU waiting
• The PC hasn't begun to run.
• One unit number has been assigned to more than
I/O Unit Over error
• SR 25415 will be turned ON and the PC won't oper-
• An error has occurred in I/O refreshing between the
Special I/O Unit error
• SR 25415 will be turned ON but PC operation will
Special I/O Unit Error Detection Bit (SR)
Bit
SR 25415 Duplicated unit number
Special I/O Unit error
32
When an error occurs in an input or in the Unit itself, the error is indicated by an
output to a flag in the IR, SR, or AR area. The following tables show the various
errors that may occur, along with their probable causes and remedies.
Probable causes and operations
• Input signal range is set to "1 to 5V/4 to 20 mA" but
the input is less than 1 V/4 mA.
• BROKEN WIRE indicator is lit.
• The Input Disconnect Flag (IR n+9, bits 00 to 07)
that corresponds to the input signal is turned ON.
(Bits 00 to 07 correspond to inputs 1 to 8.)
• The output data (conversion data or calculation
result) isn't within the preset limits.
• The Limit Warning Flag (IR n+9, bits 08 to 15) that
corresponds to the input signal is turned ON.
(Bits 08 to 15 correspond to inputs 1 to 8.)
Probable causes and operations
one Special I/O Unit.
ate when an "I/O Unit Over error" occurs.
Flags AR 0000 to AR 0011 indicate the duplicated
unit number.
CPU and the Special I/O Unit.
continue when a "Special I/O Unit error" occurs.
Error
The same number is assigned to
more than one Special I/O Unit.
An error has occurred in the refresh
signal between the CPU and the
Special I/O Unit
Check the input signal wires and
connector wiring for broken wires or
disconnections.
Check the input voltage and current.
Turn ON the corresponding conversion
prohibit bits (DM m, bits 00 to 07) for
any unused inputs.
(Bits 00 to 07 correspond to inputs 1 to
8.)
Check the input signal value.
Check whether the upper- and
lower-limit values are appropriate.
Replace the Unit.
• Replace the defective Special I/O Unit.
• The defective Unit should appear as $
signs only in the I/O table read opera-
tion.
Do not assign the same number to more
than one Unit. Use the I/O table read
operation to display unit numbers.
Check AR 0000 to AR 00015 for the unit
number of the Unit in error. After
correcting the error, restart the Unit by
toggling the corresponding restart bit
(OFF→ ON → OFF) in AR 0100 to
AR 0109. If the error recurs after
restarting the Unit, replace the Unit.
Explanation
Section 2-5
Possible remedies
Possible remedies
Operation status
PC operation stops.
Operation stops only for the faulty
Unit.