Mitsubishi Electric Melsec iQ-R Series User Manual page 46

Setting example of the input signal error detection
The following shows a setting example for detecting an input signal error when an analog input value is smaller than 2.4mA in
the channel set as shown below.
Item
Input range
'CH1 Input signal error detection setting' (Un\G528)
Assign the following values in the calculation formula using the input signal error detection lower limit value.
• Input signal error detection lower limit value: 2.4mA
• Lower limit value of the range: 4.0mA
• Offset value: 4.0mA
• Gain value: 20.0mA
Input signal error detection setting value = ((4.0 - 2.4)  (20.0 - 4.0))  1000 = 100 (10.0%)
Thus, set 'CH1 Input signal error detection setting value' (Un\G529) to 100 (10.0%).
The following graph shows the operation of the input signal error detection setting value. An error is detected not only for the
lower limit of 2.4mA, but also for the upper limit of 21.6mA when the setting value is 100 (10.0%).
In
21.6mA
H
I
20mA
G
I
4mA
O
In
2.4mA
L
(1)
In : Input signal error detection upper limit value
H
I : Gain value
G
I : Offset value (Lower limit value of the input range)
O
In : Input signal error detection lower limit value
L
(1) Error detection
(2) 1.6mA (10.0% of 16mA)
(3) 16mA (Gain value - Offset value)
(4) 1.6mA (10.0% of 16mA)
1 FUNCTIONS
44
1.9 Input Signal Error Detection Function
Setting value
4 to 20mA
Upper and lower limit detection (1)
(1)
(2)
(3)
(4)