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MELSEC-Q
3 SPECIFICATIONS
3.1.2 Operation at input disconnection
Table 3.5 shows operations for each input at the occurrence of input disconnection.
Table 3.5 Operation list at input disconnection
Input Input range Operation
Thermocouple
Micro voltage
All Up scale *1
1 to 5V Down scale *2
Voltage
0 to 1V,-1 to 1V,0 to 5V,-5 to 5V,
0 to 10V,-10 to 10V
Value near 0V is displayed. *3
4 to 20mA Down scale
Current
0 to 20mA Value near 0mA is displayed. *3
1: "Input range upper limit + (Full-scale
5%)" is displayed.
2: "Input range lower limit - (Full-scale
5%)" is displayed.
3: In this case, no alert will occur at the channel without connecting a sensor, since the
measured value is within the input range.
REMARK
To judge an error, there is a method to select the range, which the sensor actually
uses, for preventing values near 0V/0mA to be displayed except when the sensor
is connected.
(Example)
If using current input 0 to 5V range, specify 1 to 4V as the input range that the
sensor actually uses.
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