48
1 FUNCTIONS
1.4 Diagnostic Function
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Output disconnection detection disable time setting
With this setting, the time where disconnection detection is disabled after an output is turned off can be selected. The
influence of back EMF immediately after an output is turned off can be eliminated and incorrect detections by the
disconnection detection function can be reduced. Select a setting range from the table below depending on the connected
device and application.
List of detectable conditions
The following shows the places at which disconnection (no connection) and short circuit (ground fault) can be detected and
the detectable conditions for the sensor power supply.
: Detectable depending on the condition,
: Undetectable
*1 A disconnection can be detected only when the output is off. However, when an output device whose load current is 3mA or lower is
connected, a disconnection may be detected even if no wiring is disconnected.
*2 A short circuit can be detected only when the output is on. When the output current is 0.5A/point or higher, a short circuit is detected.
*3 The negative common (0V) of the external power supply must be connected to the device frame.
Item
Setting range
Output disconnection detection
disable time setting
0ms
100ms (default value)
200ms
300ms
Connected device
Disconnection (no connection)
Short circuit (ground fault)
(1)
(2)
(3)
(4)
(5)
2-wire type input device
Yn
0V
COM
(2)
(3)
(4)
(5)
(1)
FG
Internal
circuit
Constant-voltage
circuit
24VDC
Load
Содержание MELSEC iQ-RX40NC6B
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