Chapter 7 Programming
From requirements 33.2.1 and 33.2.2, we can see that there is a decoupling between annunciation and reaction. The series of network variables shown in Figure 54, nvoSwitch05 through nvoSwitch12, are used to directly control the smoke alarm LEDs on the FSCP. For example, a smoke alarm for floor 1 is received. The mechanical system reacts by pressurizing floor 2 and exhausting floor 1. Following that, floor 2 goes into smoke alarm. The alarm needs to be annunciated even though the mechanical system does not react. In this case, nvoSwitch06 passes the smoke alarm state to MP580-3 by using a custom binding. At MP580-3, the binary output that controls the floor 2 smoke alarm LED is turned on.
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