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Troubleshooting Section 9-2
9-2-2 Troubleshooting by Slave Model
Model Details Probable cause Remedy
Errors occurring all
Slaves
MS and NS indicators are a
constant red.
See 9-2-1 Troubleshooting by
LED Indicators.
---
The Network Power Voltage
Error Flag does not go ON
even when the network power
supply voltage drops.
The network power voltage
monitor value is set too low.
(The default setting is 11 V.)
Increase the network power
voltage monitor value.
The appropriate network power
supply voltage is being sup-
plied, but a Network Power
Voltage Error is still detected.
The network power voltage
monitor value is set too high.
Decrease the network power
voltage monitor value.
The network power voltage
monitor value cannot be set.
The 11 to 25 V setting range
has been exceeded.
Set a value within the 11 to 25
V setting range.
The I/O comment or Unit com-
ment cannot be set.
A comment longer than 32
characters is being set.
Set a comment up to 32 char-
acters long.
The Unit Maintenance or Con-
nected Device Maintenance
Status Flag will not go ON.
The maintenance status func-
tion is disabled if the monitor
value is set to 0.
Set the monitor value to a
non-zero value.
One of the following values was
not held at its previous value
when the Unit’s power was
turned ON again.
General-purpose Slaves:
Unit Conduction Time or Main-
tenance Counter value
Temperature Input Terminals:
Temperature Range Total Time
or Top/Valley Count value
When the power is ON, these
values are saved to the Unit’s
non-volatile memory once
every 6 minutes.
The Save Maintenance
Counter function can be used
to save these values immedi-
ately. If the power is turned
OFF without saving the val-
ues, the last stored values (up
to 6 minutes old) will be read.
Execute the Save Mainte-
nance Counter function before
turning OFF the power.
Errors occurring in all
Slaves except the Ana-
log Slaves
The Maintenance Counter
value returned to 0.
The counter is reset to 0 when
the Unit is reset.
The counter is reset to 0 when
the Maintenance Counter set-
ting is switched between Total
ON Time Monitor and Contact
Operation Counter.
---
Parameters were edited or set,
but some functions were not
changed.
The changed function will be
enabled only when power is
turned OFF and ON again.
Reset the Slave by turning the
power OFF and ON, or reset-
ting from the Configurator.
An output is turned ON, but the
Maintenance Counter is not
incremented.
The I/O power supply is OFF. Check whether the I/O power
supply is being supplied.
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