Mitsubishi MELSEC iQ-F, User Manual

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52
4 FUNCTIONS
4.9 Input Signal Error Detection Function
Setting example
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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 e10.235 V or
falls below -10.24 V.
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
Set 'CH1 Input signal error detection lower limit set value' (Un\G529) to 24 (2.4%).
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.
Item Setting value
Input range -10 to +10 V
'Input signal error detection auto-clear enable/disable setting' (Un\G302) Disable (1)
'CH1 Input signal error detection setting' (Un\G528) Upper and lower limit detection (1)
[Calculation of lower limit value]
=
= 24 (2.4%)
Input signal error detection lower limit
setting value × 1000
-10.0 - (-10.24)
10.0 - 0.0
[Calculation of upper limit value]
=
 24 (2.35%)
Input signal error detection upper limit
setting value × 1000
10.235 - 10.0
10.0 - 0.0
+10.24 V
+10 V
-10 V
0 V
0.24 V
0.24 V
10 V
-10.24 V
(  -10.235 V)
Input signal error detection
upper limit value
Gain value
Offset value
Lower limit value of input
range
Input signal error detection
lower limit value
Error
detected
Error
detected
(7.5% of 16 mA)
(22.5% of 16 mA)
(Gain value - Offset value)
Detection range
Outside detection range
Included
Analog input voltage