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Maintenance Section 9-3
9-3 Maintenance
This section describes the routine cleaning and inspection recommended as
regular maintenance. Handling methods when replacing Units are also
explained here.
9-3-1 Cleaning
Clean the DeviceNet Units regularly as described below in order to keep the
Network in its optimal operating condition.
• Wipe the Unit with a dry, soft cloth for regular cleaning.
• When dust or dirt cannot be removed with a dry cloth, dampen the cloth
with a neutral cleanser (2%), wring out the cloth, and wipe the Unit.
• Smudges may remain on the Unit from gum, vinyl, or tape that was left on
for a long time. Remove these smudges when cleaning.
Note Never use volatile solvents such as paint thinner or benzene, or chemical
wipes to clean the Unit. These substances may damage the surface of the
Unit.
9-3-2 Inspection
Inspect the system periodically to keep it in its optimal operating condition.
In general, inspect the system once every 6 to 12 months, but inspect more
frequently if the system is used in high-temperature, humid,- or dusty condi-
tions.
Errors occurring in the
DRT2-TS04@ Tempera-
ture Input Terminal only
The 1/100 display mode has
been set, but the display reads
0.
The allocated word is a one-
word normal display area.
Either change the default con-
nection path to a 1/100 dis-
play area or select a
connection path in the Master
for the 1/100 display area.
The temperature difference
detected by the Data Compari-
son between Channels function
is not rising properly.
A value other than the temper-
ature value is allocated to
analog data 2.
(The temperature difference
display is always a 1/100 dis-
play.)
Allocate the temperature
value to analog data 2.
The Zone Counter is not count-
ing even though the tempera-
ture value is set as the count
condition.
The Comparator function is
not enabled as a function
type.
Enable the Comparator func-
tion. (The power must be
turned OFF and then ON
again.)
The Top/Valley Count Over
Flag will not go ON (DRT2-
TS04T only).
The Top/Valley function is not
enabled as a function type.
The hysteresis setting is too
high.
The hysteresis setting is 0.
Enable the Top/Valley func-
tion. (The power must be
turned OFF and then ON
again.)
Adjust the hysteresis setting.
The Comparator function does
not operate as expected even
though the function and hyster-
esis value have been set.
The temperature display set-
ting has been switched (°C to
°F or vice versa).
The decimal point position
was read incorrectly.
Check the decimal point posi-
tion and °C/°F display for the
input type and display mode.
If these settings have been
changed during operation,
check the Comparator func-
tion and hysteresis settings
and correct if necessary.
Model Details Probable cause Remedy
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