Alert Output Function - Mitsubishi Electric MELSEC iQ-F FX5 User Manual

Alert output function

Outputs an alarm when the digital value exceeds the warning output upper limit value or is below the warning output lower
limit value.
Operation
■Warning output notification
When 'CH1 Digital value' (Un\G460) exceeds 'CH1 Alert output upper limit' (Un\G510) or falls below 'CH1 Alert output lower
limit' (Un\G512), an alarm is output when 'Alarm output upper limit flag' (Un\G36), 'Alarm output lower limit flag'(Un\G37), or
'Warning output signal' (Un\G69, b14) turns on and the ALM LED turns on. When an alarm occurs, alarm code 080H or
081H is stored in 'Latest alarm code' (Un\G2).
When an alarm occurs, one of the following is executed depending on 'CH1 Alert output setting' (Un\G508).
• If the setting is Enable (output not limited), the D/A conversion will be executed with the set digital values.
• If the setting is Disable (output limited), the D/A conversion will be executed with the setting values of the warning output
upper and lower limit values handled as digital values.
After a warning occurs and 'CH1 Digital value' (Un\G460) becomes less than 'CH1 Alert output upper limit value' (Un\G510) or
larger than 'CH1 Alert output lower limit value' (Un\G512), the analog output value returns to the normal value, but 'Alarm
output upper limit flag' (Un\G36), 'Alarm output lower limit flag' (Un\G37), and 'Alarm output signal flag' (Un\G69, b14) are not
cleared.
Clear the warning
There are the following two methods to clear the warning output.
Set 'CH1 Digital value' (Un\G460) to a value equal to or smaller than 'CH1 Alert output upper limit value' (Un\G510) and equal
to or larger than 'CH1 Alert output lower limit value' (Un\G512). Then,
• Turn offonoff 'Alarm output clear request' (Un\G70, b14).
• Turn offonoff 'Operating condition setting request' (Un\G70, b9).
The analog output module changes to the following status when the warning output is cleared.
• 'Alarm output upper flag' (Un\G36) and 'Alarm output lower flag' (Un\G37) are cleared.
• 'Alarm output signal' (Un\G69, b14) turns off.
• The ALM LED turns off.
• The alarm code stored in 'Latest alarm code' (Un\G2) is cleared.
Setting procedure
1.
Set 'Warning output setting' to 'Enable (output not limited)' or 'Disable (output limited)'.
[Navigation window]  [Parameter]  [Module Information]  Module model name  [Module Parameter] 
[Application setting]  [Warning output function]
2.
Set values for "Warning output upper limit value" and "Warning output lower limit value".
Set the warning output upper and lower limit values in the following conditions.
• Warning output upper limit value > Warning output lower limit value
Item
Warning output upper limit value
Warning output lower limit value
Precautions
When the shift function is used in the normal mode, the 'CH1 Digital value' (Un\G460) for which shift-and-add was performed
will be processed as the target of alarm detection. For the warning output upper and lower limit values, be sure to set the
values, taking shift-and-add into consideration.
Setting range
-32768 to +32767
2
2 FX5-4DA
193
2.4 Functions