Omron CRT1 - 10-2009 Operation Manual page 607

Troubleshooting
Model
All models other than The Maintenance Counter
Analog I/O Slave returned to 0.
Units
Some functions do not change
even after parameters have
been edited or set.
The Maintenance Counter is
not counting even though out-
puts are turned ON.
Slave Units to which I/O communications stopped
Expansion Units can after mounting or removing an
be mounted Expansion Unit and turning ON
the power.
The MS indicator lights red
after mounting or removing an
Expansion Unit online.
Slave Units with The Operation Time Monitor
Operation Time Moni- does not show the expected
tor Function values.
The status flag for the Opera-
tion Time Monitor value turns
ON and OFF.
Slave Units with out- Cannot hold outputs when
puts communication errors occur.
Cannot clear outputs when
communication errors occur.
Slave Units with There is a delay with the ON
inputs and OFF timing for input val-
ues.
Problem
• The Maintenance Counter will
return to 0 if the Unit is reset.
• The Maintenance Counter will
always return to 0 when the
setting is switched between
the Total ON Time Monitor
Function and the Contact
Operation Monitor Function.
The functions that have been
changed are enabled only after
the power is cycled.
The I/O power supply is OFF.
The number of I/O points
increase or decrease when
Expansion Units are mounted
or removed. The number of I/O
points may not match the I/O
table registered in the Master
Unit.
Expansion Units cannot be
mounted or removed online.
• If the input filter is set, there is
a delay with the ON or OFF
time.
• The operation time ON or
OFF edge selection may not
be on the intended setting.
• The selected operation time
combination is not supported.
If the operation time monitor
does not show the expected
values, the settings may be
different from the intended
settings. The accuracy is ±6
ms.
The Operation Time Flag is
refreshed every measurement
cycle, after the operation time
is compared with the monitor
value. The Operation Time
Flag turns ON for one cycle
and turns OFF, if the operation
time drops below the monitor
value at refreshing. There is
another flag that holds the con-
tents of monitor value
exceeded flags.
The Unit is set to clear outputs
for communications errors.
The Unit is set to hold outputs
for communications errors.
An input filter may be set.
Cause Possible correction
---
Cycle the power or reset the
CX-Integrator.
Check that the I/O power sup-
ply is turned ON.
Change the Master Unit I/O
table settings.
Turn OFF the power before
mounting or removing Expan-
sion Units.
• Use the Operation Time Mon-
itor function considering the
filter setting or set the filter
constant to 0 ms.
• Check the operation time
combination set for Slave
Units for which the operation
time edge can be set.
---
Change the setting to hold out-
puts for communications
errors.
Change the setting to clear
outputs for communications
errors.
Set the input filter value to 0.
Alternatively, change the input
filter to an appropriate value.
Section 12-2
583