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DRT2 Features Section 1-1
Slave Comments User-set names can be assigned and saved in the Slave for each Unit.
I/O Comments User-set names can be assigned and saved in the Slave for each of the I/O
contacts, such as sensors or valves, that are connected to the Slave.
Communications Error
History Monitor
The error statuses (communications error cause code and communications
power supply voltage when error occurred) for the last four communications
errors that occurred can be recorded in the Slave. The Configurator can be
used to read the information.
Last Maintenance Date The dates on which maintenance is performed can be written to the Unit using
the Configurator.
Features of General-purpose Slaves and Environment-resistive Slaves
No Internal Circuit Power
Supply Wiring for Slaves
The communications power supply is used for the internal circuit power for the
Unit. This eliminates the need to wire the Unit's internal circuit power supply.
I/O Power Status Monitor The I/O Power Status Monitor is used to detect whether the I/O power supply
is connected and provide notification in the Status Area. The Configurator or
explicit messages can be used to read the information.
Input Filter The input filter is used to read the input value several times during the set
interval and remove irregular data caused by noise and switch chattering.
This function can also be used to create ON/OFF delays.
Power ON Delay The I/O power supply can be monitored to stop any input when the I/O power
is OFF and for 100 ms after it is turned ON. This function prevents incorrect
inputs caused by inrush current at startup after the I/O power is turned ON.
Contact Operation
Counter
The number of times each input or output contact changes from OFF to ON
can be counted (maximum resolution: 50 Hz). The Configurator or explicit
messages can be used to read the information. The Slave also maintains a
set value for monitoring the number of contact operations, and will provide
notification in the Status Area if the set value is reached.
Note The Contact Operation Counter and Total ON Time Monitor cannot be used at
the same time for a single contact.
Total ON Time Monitor This function is used to total and record in the Slave the time that devices,
such as sensors and relays, that are connected to the Slave are ON. The
Configurator or explicit messages can be used to read the information. The
Slave also maintains a set value for monitoring the total ON time, and will pro-
vide notification in the Status Area if the set value is reached.
Note The Total ON Time Monitor and Contact Operation Counter cannot be used at
the same time for a single contact.
Detection of Sensor Power
Short-circuit
The I/O power supply current is monitored and if the current exceeds the rated
current, it is judged to be a sensor power short-circuit and the sensor power
output is forced OFF.
Environment-resistive Slaves, Advanced Models: The number of the shorted
contact can be checked from the I/O status indicators. The Configurator or
explicit message communications can also be used to read which connector
or sensor has shorted. The Slave will automatically reset when the cause of
the short-circuit has been removed.
Sensor Connector Terminals: When a short-circuit is detected in any of the
contacts, the I/O power for the Unit is turned OFF. A short-circuit detection
error can be confirmed using the SHTO indicator. The Configurator or explicit
messages can also be used to read the error status.
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