Mitsubishi Electric MELSEC iQ-F FX5 User Manual page 56

Detection method
One of the following detection methods can be selected.
Detection method
0: Disable
1: Upper and lower limit
detection
2: Lower limit detection
3: Upper limit detection
4: Simple disconnection
detection
■Simple disconnection detection
Simple disconnection detection is enabled by the range setting. The simple broken wire detection is supported only in the "4
to 20 mA" or "1 to 5 V" range. When an analog input value satisfies either of the following conditions, a disconnection occurs
and 'Input signal error detection flag' (Un\G40) turns on.
Input range
4 to 20 mA
1 to 5 V
Analog input value
2 mA or 0.5 V
Error
detection
The settings for 'CH1 Input signal error detection lower limit setting value' (Un\G529) and 'CH1 Input signal error detection
upper limit setting value' (Un\G530) are ignored.
1 FX5-4AD
54
1.4 Functions
Detection condition
Input signal errors are not detected.
An input signal error is detected when the
analog input value is equal to or greater
than the input signal error detection upper
limit value, or when the analog input value
is equal to or smaller than the input signal
error detection lower limit value.
An input signal error is detected when the
analog input value is equal to or smaller
than the input signal error detection lower
limit value.
An input signal error is detected when the
analog input value is equal to or greater
than the input signal error detection upper
limit value.
Simple disconnection detection is performed. For details, refer to the following.
Page 54 Simple disconnection detection
Time

Analog input value
Error
detection
Input signal error detection
upper limit value
Input signal error detection
lower limit value
Error
detection
Analog input value
No error
detection
Input signal error detection
upper limit value
Input signal error detection
lower limit value
Error
detection
Analog input value
Error
detection
Input signal error detection
upper limit value
Input signal error detection
lower limit value
No error
detection
Disconnection detection signal
Analog input value  2 mA
Analog input value  0.5 V
Time
Time
Time