Detection Of Sensor Power Short-Circuit - Omron DRT2 SERIES DEVICENET SLAVES - OPERATION MANUAL 04-2008 Operation Manual

Functions of General-purpose Slaves and Environment-resistive Slaves
4-3-8

Detection of Sensor Power Short-circuit

Function Overview
74
From the Maintenance Mode Window, click the right mouse button over the
icon of the DRT2-series Smart Slave to be set. Select Parameter and Edit
to display the Edit Device Parameters Window.
3. Select the IN Tab.
4. Double-click the name of the applicable terminal to display the following
window. Enable off-wire (disconnection) detection and click the OK Button.
5. Select the General Tab, click the Download Button, and then click the Re-
set Button to reset the Unit.
6. Click the OK Button.
DRT2-ID@@C(-1), DRT2-ID16S(-1), DRT2-MD16S(-1), DRT2-ID@@SLH(-1),
and DRT2-MD32SLH(-1)
The sensor power supply current can be monitored, and when the current
reaches or exceeds 100 mA per input contact (two contacts per connector for
a 16-point Environment-resistive Input Terminal), a sensor power short-circuit
is detected.
If a sensor power short-circuit is detected when using Environment-resistive
Terminals or Screw-less Clamp Terminals, the sensor power output is forced
OFF for the contact. (Input contacts that have not short-circuited will continue
to operate normally.) The indicators on the Slave can be used to check which
contacts have been detected with power short-circuits. (Refer to the informa-
tion below.)
If a short-circuit is detected in any of the contacts when a Sensor Connector
Terminal is being used, the I/O power is turned OFF for the Unit. Check
whether a sensor power short-circuit has been detected using the indicators
on the slave.
When a sensor power short-circuit is detected, the Sensor Power Short-cir-
cuited Flag in the Status Area will turn ON. The Sensor Power Short-circuited
Flag can be read using the Configurator or explicit messages. The sensor will
automatically recover when the cause of the short-circuit is removed, and the
Section 4-3