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Troubleshooting Section 9-2
Errors occurring in
Slaves that support
Expansion Units
DRT2-ID16(-1)
DRT2-OD16(-1)
DRT2-ROS16
I/O communications could not
be used after mounting the
Expansion Unit and turning ON
the power.
When an Expansion Unit is
mounted or removed the num-
ber of I/O points changes, so
the Master’s scan list may not
match the actual system.
Set the Master’s scan list
again.
An Expansion Unit was
mounted or removed online
and the MS indicator is lit red.
Expansion Units cannot be
mounted or removed online
Turn OFF the power before
mounting or removing an
Expansion Unit.
The Operation Time Monitor
function cannot be used.
This function is usable only
when an Input Unit and Out-
put Unit are used together.
With the DRT2-ID16(-1):
Function is usable only when
an XWT-OD08(-1) or XWT-
OD16(-1) is mounted.
With the DRT2-OD16(-1) or
DRT2-ROS16:
Function is usable only when
an XWT-ID08(-1) or XWT-
ID16(-1) is mounted.
The function is not supported
by the DRT2-ID08(-1), DRT2-
OD08(-1), DRT2-ID16S,
DRT2-HD16C, DRT2-ID08C,
or DRT2-OD08C.
---
Errors occurring in
Slaves that support the
Operation Time Moni-
tor function
DRT2-ID16(-1)*
DRT2-OD16(-1)*
DRT2-ROS16*
DRT2-MD16(-1)
DRT2-MD16S(-1)
DRT2-@D16TA(-1)
DRT2-@D16ML(X)(-1)
DRT2-@D32ML(-1)
DRT2-@D32B/BV(-1)
DRT2-@D@@SL/SLH(-
1)
DRT2-@D04CL(-1)
DRT2-MD16CL(-1)
* Supported only when
an Expansion Unit is
mounted and the
Slave can be used as
an I/O Unit.
The Operation Time Monitor is
not showing the expected
value.
When the input filter is being
used, there will be a delay in
the ON time or OFF time.
In Slaves other than the
Basic, Sensor Connector
types, and Environment-resis-
tive Slaves, the operation time
can be set to measure from
the rising edge or falling edge
of the signals. This setting
may be incorrect.
In Slaves other than the Basic
and Sensor Connector types,
the operation time combina-
tion can be set. If the values
are not as expected, this set-
ting may be incorrect. The
accuracy is ±6 ms.
Take into account the effect of
the filter settings on the Oper-
ation Time Monitor or set the
filter constants to 0 ms.
Recheck the Operation Time
edge settings and combina-
tion settings in Slaves that
support those settings.
The Operation Time Over Flag
is going ON and OFF.
The operation time is com-
pared to the monitoring set
value and the Operation Time
Over Flag is updated for each
measurement. Even if this flag
turns ON, it will turn OFF the
next time it is updated (i.e., for
the next measurement) if the
operation time is below the
monitoring set value.
All Slaves except for Standard
Slaves and Sensor Connec-
tor Slaves have flags that hold
status when the monitoring
set value is exceeded.
---
Model Details Probable cause Remedy
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