Omron DRT2 SERIES DEVICENET SLAVES - OPERATION MANUAL 04-2008 Operation Manual page 98

Functions of General-purpose Slaves and Environment-resistive Slaves
I/O Indicator Status when Short-circuit is Detected (Environment-resistive Terminal Input Units)
recovery method using the Configurator or explicit messages. (The factory
setting is for manual recovery.)
Environment-resistive Terminal, Sensor Connector
Terminal, or Screw-less Clamp Terminal
Short-
circuit
External load
Note 1. Refer to Load Short-circuit Protection: DRT2-OD16SLH and DRT2-
OD16SLH-1 on page 218 and Load Short-circuit Protection: DRT2-
OD08C and DRT2-OD08C-1 on page 258 for more information.
2. Environment-resistive Terminals
The OMRON S8@@ Power Supply Unit is recommended for the I/O power
supply. The load short-circuit detection function uses the transistor's ther-
mal shutdown, so when a Power Supply Unit with a low-capacity rating or
instantaneous shutoff overcurrent protection is used, the load short-circuit
may not be detected. Always use a Power Supply Unit with a rating of
100 W or higher if it uses a dropping overcurrent protection characteristic.
Always use a Power Supply Unit with a rating of 150 W or higher if it uses
intermittent overcurrent protection. The current limiter will protect the tran-
sistor even if short-circuit detection is disabled.
Sensor Connector Terminals
The OMRON S8@@ Power Supply Unit is recommended for the I/O power
supply. If a Power Supply Unit with a dropping overcurrent protection char-
acteristic is used, the load short-circuit may not be detected. Always use a
Power Supply Unit with a rating of 100 W or higher if it uses a dropping
overcurrent protection characteristic. Always use a Power Supply Unit with
a rating of 150 W or higher if it uses intermittent overcurrent protection. The
current limiter will protect the transistor even if short-circuit detection is dis-
abled.
■ Automatic Recovery Mode
When the cause of the short-circuit has been removed, the short-circuit pro-
tection status will automatically be cleared by rewiring the corresponding con-
tact correctly. After short-circuit detection, the short-circuit protection status
will also be cleared automatically by turning OFF the output. The output must
remain ON for checking the Status Area and indicators.
I/O Indicator Status when Short-circuit Detected
-A
Lit yellow.
The box indicates the number of the corresponding connector.
Note Refer to SECTION 6 Environment-resistive Slaves for the position of the
actual indicator.
Output forced OFF.
Has the external load
shorted?
-B
Lit red.
Section 4-3
77