Omron CQM1H - 08-2005, Operation Manual

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Appendix B
Troubleshooting
Analog Input Unit
Kind of error Phenomenon Cause Remedy
Indicator The RDY indicator is not lit. 1. The Unit is not connected
properly.
2. No end cover is attached.
Refer to the CQM1H/CQM1
Operation Manual and reset the
Analog Input Unit.
The ERR indicator is lit. The DIP switch is set to prohibit
the conversion of all inputs. Refer to 2-1 Nomenclature and
set the DIP switch properly.
The BROKEN WIRE indicator is
lit. An input set to a range of 1 to 5
V or 4 to 20 mA is
disconnected. Check the wiring, terminal
board, input voltage, and input
current.
Unused analog input is set to a
range of 1 to 5 V or 4 to 20 mA. Set the unused analog input to
any other range or set to
prohibit conversion.
No. of words The Analog Input Unit can be
allocated to two words only or
allocated to four words. The DIP switch setting is
incorrect. The DIP switch setting can be
monitored with the 2 CH and 4
CH indicators. Check whether
the setting is proper. If not, set
the DIP switch properly.
Conversion data The conversion data of the
Analog Input Unit does not
change even if the input voltage
or current is changed. The power cable is not
connected to the Analog Power
Supply Unit. Connect the power cable.
The voltage or current input is
not within the range that has
been set. Check the input voltage or
current or the range that has
been set.
The conversion data of the
Analog Input Unit changes
slowly when the input voltage or
current is changed. The mean value processing
function is working. Set the mean value processing
switch properly.
I/O Unit over The CPU has an I/O Unit over
error. The total number words used
by the Units connected exceed
the maximum available words
of the CPU. Each Analog Input Unit uses
four or two words. Check if the
total number of words are
exceeding the maximum
available words of the CPU.
Analog Power Supply Unit
Kind of error Phenomenon Cause Remedy
LED The P/S (P/S1, P/S2) indicator
is not lit. The power supply cable of the
Analog Input Unit is not
connected to the Analog Power
Supply Unit. Connect the power supply
cable to the Analog Power
Supply Unit. Turning on the
Analog Power Supply Unit will
not cause the P/S (P/S1, P/S2)
indicator to be lit if the power
supply cable of the Analog
Input Unit is not connected to
the Analog Power Supply Unit.
Power is not supplied to the
system. Supply power to the system.