Mitsubishi L Series User Manual page 74

(6) Example of input signal error detection
To detect an error when the analog input value becomes lower than 2.4mA for a channel with an input range
Ex.
of 4mA to 20mA:
Substitute the following values into the input signal error detection lower limit value.
• Input signal error detection lower limit value: 2.4mA
• Input range lower limit value (Offset value): 4.0mA
• Gain value: 20.0mA
Therefore, set the input signal error detection setting value to 100 (10.0%).
In this case, the input signal error detection value behaves as follows. (With the 100 (10%) setting, an error is
detected when the value is not only 2.4mA, but also 21.6mA.)
Input signal error detection
upper limit value
21.6mA
Gain value 20mA
Input range
lower limit value
4mA
(Offset value)
2.4mA
Input signal error detection
lower limit value
72
Input signal error detection
setting value
Error
detection
4.0 - 2.4
1000
=
20.0 - 4.0
=
100(10.0%)
Error
detection
1.6mA
(10.0% of 16mA)
16mA
(Gain value - Offset value)
1.6mA
(10.0% of 16mA)