Omron DRT2 SERIES DEVICENET SLAVES - OPERATION MANUAL 04-2008 Operation Manual page 25

DRT2 Features
External Load Short-
circuit Detection
Sensor Disconnected
Detection
Features of Remote I/O Terminals (General-purpose Slaves)
Detachable Terminal
Block
Expansion Units
Operation Time Monitor
Features of Connector Terminals (General-purpose Slaves)
Wired with Industry
Standard Sensor
Connectors (Sensor
Connector Terminals)
Operation Time Monitor
4
Screw-less Clamp Terminals (DRT2-@D32SLH-1): The number of the shorted
contact can be checked using the I/O status indicators. The Configurator or
explicit message communications can also be used to read which terminal
sensor has shorted. The Slave will automatically reset when the cause of the
short-circuit has been removed.
External Load Short-circuit Detection monitors the output load current and if
the Output Unit's current exceeds the set value, it is judged to be an external
load short-circuit and the output is forced OFF to prevent damage to the Unit's
output circuit. When an external load short-circuit is detected, the External
Load Short-circuit Detection Flag turns ON. The External Load Short-circuit
Detection Flag can be read by either the Configurator or explicit messages.
The I/O power supply current is monitored and it is determined whether a sen-
sor is disconnected. The Configurator or explicit messages can be used to
read which sensor is not connected.
The terminal block can be detached.
A Basic Unit can be combined with an Expansion Unit. The various I/O combi-
nations that are possible, such as 16 inputs and 8 outputs, or 24 inputs (16
inputs plus 8 inputs), increase the system configuration possibilities.
■ Basic I/O Unit + Expansion Unit
The time that lapses from when the output turns ON to when the input turns
ON can be measured at high speed from the Slave (without relying on the lad-
der program). The Slave also maintains a set value for monitoring the opera-
tion time, and will provide notification the Status Area if the set time is
exceeded. The Configurator or explicit messages can be used to read the
information.
The DRT2-MD16(-1) cannot be expanded with an Expansion Unit, but its
operation time can be monitored.
■ Three-tier Terminal Block
In contrast to the existing Units, which could only measure I/O (OUT-IN), these
Units can also measure operating times for IN-IN and OUT-OUT combina-
tions. In addition, the trigger edge (ON to OFF or OFF to ON) can be selected
and input and output numbers can be freely combined for flexible settings.
Industry standard sensor connectors are provided to standardize the I/O wir-
ing, thereby making wiring simpler and less labor intensive.
■ Sensor Connector Terminals
The time that lapses from when the output turns ON to when the input turns
ON can be measured at high speed from the Slave (without relying on the lad-
der program). The Slave also maintains a set value for monitoring the opera-
tion time, and will provide notification the Status Area if the set time is
exceeded. The Configurator or explicit messages can be used to read the
information.
Section 1-1