Mitsubishi Electric MELSEC iQ-F FX5 User Manual page 369

Setting example
■Setting example of the input signal error detection
In the channel where the following values are set, an input error is detected when an analog input value exceeds +10.235 V or
falls below -10.24 V.
Item
Input range
'Input signal error auto-clear enable/disable setting' (Un\G304)
'CH1 Input signal error detection setting' (Un\G528)
Assign the following values in a formula to determine the input signal error detection lower limit set value and input signal error
detection upper limit set value.
• Input signal error detection lower limit value: -10.24 V
• Input signal error detection upper limit value: 10.235 V
• Offset value: 0.0 V
• Gain value: 10.0 V
[Calculation of lower limit value]
Input signal error detection lower limit
setting value
Set 'CH1 Input signal error detection lower limit set value' (Un\G529) to 24 (2.4%).
[Calculation of upper limit value]
Input signal error detection upper limit
setting value
Set 'CH1 Input signal error detection upper limit set value' (Un\G530) to 24 (2.35%).
The following figure shows the operation of the input signal error detection.
Analog input voltage
+10.24 V
Input signal error detection
upper limit value
Gain value +10 V
Offset value 0 V
-10 V
Lower limit value of input
range
-10.24 V
(-10.235 V)
Input signal error detection
Error
lower limit value
detected
-10.0 - (-10.24)
= × 1000
10.0 - 0.0
= 24 (2.4%)
10.235 - 10.0
= × 1000
10.0 - 0.0
 24 (2.35%)
Error
detected
Setting value
-10 to +10 V
Disable (1)
Upper and lower limit detection (1)
0.24 V
(7.5% of 16 mA)
10 V
(Gain value - Offset value)
0.24 V
(22.5% of 16 mA)
Detection range
Outside detection range
Included
3 FX5-8AD
3.4 Functions
3
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