Mitsubishi Electric MELSEC iQ-F FX5 User Manual page 57

Notification
When an input signal error is detected, an error is notified as follows.
• The input signal error (1) is stored in the bit position corresponding to the channel number of 'Input signal error detection
flag' (Un\G40).
• 'Input signal error detection signal' (Un\G69, b12) turns on.
• The ALM LED flashes.
• An alarm code is stored in 'Latest alarm code' (Un\G2). Alarm codes are stored whenever the analog input value satisfies
the condition for the input signal error detection. (Page 106 List of alarm codes)
Operation
On the channel where an error is detected, the last digital output value and digital operation value just before the error was
detected are stored.
When the analog input does not satisfy the condition of the input signal error detection, the A/D conversion restarts regardless
of the reset on 'Input signal error detection flag' (Un\G40) or 'Input signal error detection signal' (Un\G69, b12). (The ALM LED
remains flashing.)
• When an input signal error occurs, the digital output value and digital operation value are not updated.
• The A/D conversion continues on the channel where no Input signal error is detected.
• Whether an input signal error occurred is judged with the value when the first A/D conversion is completed.
Thus, A/D conversion completed flag turns on even when an input signal error is detected.
• A cycle to output the input signal error is within 2 ms. When the input signal error is detected multiple times
within 2 ms, only the first input signal error detected may be notified.
Clearing input signal errors
One of the following methods for clearing input signal errors can be selected by setting 'Input signal error auto-clear enable/
disable setting' (Un\G302).
■When Input signal error auto-clear enable/disable setting is set to Disable (1)
After the analog input value returns within the set range, turn offonoff 'Error clear request' (Un\G70, b15).
The analog input module arranges the following status when an input signal error is cleared.
• 'Input signal error detection flag' (Un\G40) is cleared.
• 'Input signal error detection signal' (Un\G69, b12) turns off.
• The ALM LED turns off.
• 'Latest alarm code' (Un\G2) is cleared.
■When Input signal error auto-clear enable/disable setting is set to Enable (0)
After the analog input value returns to within the setting range, the analog input module arranges the following status
automatically.
• 'Input signal error detection flag' (Un\G40) is cleared.
• 'Input signal error detection signal' (Un\G69, b12) turns off.
• The ALM LED turns off.
'Latest alarm code' (Un\G2) is not cleared.
After the analog input value returns within the setting range, turn offonoff 'Error clear request' (Un\G70,
b15) to clear 'Latest alarm code' (Un\G2).
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1.4 Functions