B Troubleshooting - Omron CQM1 Operation Manual

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