Nova5
Member
Looking to silence an alarm from a HMI Button. Right now the HMI button command is set to Pulse the binary bit.
Will the attached logic work to silence the alarm but allow the light to remain on?
When the program starts no alarms should be present (supposing the system is properly primed) Temps will be in range, HH's will not be in alarm state. As the Start permissives require that to be correct.
Any Alarm going High in logic will set the Alarm Light+Horn to True.
So the Alarm Light Output should be TRUE on the NC switch(due to false in the referenced input), ONS sees the False/True transition, allowing the rung to go true, Latching Alarm Horn Silence Logic Bit. which will allow alarms to trigger the horn.
Next when/if the Alarm Horn Silence HMI button is pressed that run goes true and unlatchs the Alarm Horn Silence Logic Bit, silencing the alarm.
The button on the HMI is only visible and usable when an alarm has triggered the Alarm Light/Horn.
When the alarm(s) clear, the light goes false and the corresponding NC contact on line 2 goes true, latching the horn logic bit for the next alarm to successfully call for the horn.
I'm a little new at this so my explanation may be a little rough. The attachment is just from a clean program So i could look at it without affecting my actual program.
Will the attached logic work to silence the alarm but allow the light to remain on?
When the program starts no alarms should be present (supposing the system is properly primed) Temps will be in range, HH's will not be in alarm state. As the Start permissives require that to be correct.
Any Alarm going High in logic will set the Alarm Light+Horn to True.
So the Alarm Light Output should be TRUE on the NC switch(due to false in the referenced input), ONS sees the False/True transition, allowing the rung to go true, Latching Alarm Horn Silence Logic Bit. which will allow alarms to trigger the horn.
Next when/if the Alarm Horn Silence HMI button is pressed that run goes true and unlatchs the Alarm Horn Silence Logic Bit, silencing the alarm.
The button on the HMI is only visible and usable when an alarm has triggered the Alarm Light/Horn.
When the alarm(s) clear, the light goes false and the corresponding NC contact on line 2 goes true, latching the horn logic bit for the next alarm to successfully call for the horn.
I'm a little new at this so my explanation may be a little rough. The attachment is just from a clean program So i could look at it without affecting my actual program.