Sensaphone SCADA 3000 Users manual - Manual (Page 185)

15-29
Chapter 15: Ladder Logic Programming
example #5
The following program will monitor a normally-open push-button switch connected to input
10. When the switch is depressed the program will reset (acknowledge) alarm 0. The OSR
instruction prevents the reset instruction from being executed continuously and allows the
alarm to proceed if the switch were to become shorted.
Figure 16: OSR instruction