Ronan X16PDM - Manual (Page 42)

Rev 1.0 Series X11CA Hardware Manual
3. Event Sequences
Hardware Control-© 2002 Ronan Engineering 38
3.4.8 M-1
Manual Reset
Sequence M is a basic alarm sequence (Horn on with Flashing Visual) with
Manual Reset that retains acknowledged alarms until the process input conditions
return to normal and the manual Reset pushbutton is activated. In some
applications, Sequence M may have a disadvantage since new alarms that occur
while the Acknowledge Pushbutton is being operated appear in the steady on
condition. Any alarm occurring during the Acknowledge pushbutton operation
may be confused with existing acknowledged alarms. In order to reset alarms,
sequence M requires that the Reset pushbutton be operated repeatedly to
determine if the process input conditions have returned to normal. Use of Options
1 and 2 improves the sequence of for reviewing new incoming alarms.