How Does The "Or" Function Work - Pittway NOTIFIER AM2020 Troubleshooting Manual

How Does the "OR"
Function Work?
20
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The "OR" function operates identically to a logic OR statement. It may be used
in the Control-By-Event equation of an output type device (CMX, XPC, or XPR
modules) or of a reverse-activated zone.
Equation Format: OR(Za Zb)
Example 1: Assume that Zone 208 is a reverse activated zone with the following Control-
By-Event equation:
OR(Z100 Z201)
This means that if either Zone 100 OR Zone 201 activate then Zone 208 will activate. The
logic gate equivalent of this equation would look like Figure 3-4.
Figure 3-4: Logic gate equivalent of a two input OR equation.
If it easier to visualize, this equation can also be represented in electrical terms as two
normally open switches in parallel. So that if either one of the switches (Zone 100 or Zone
201) is activated, then the lamp (Zone 208) will turn on.
Figure 3-5: Electrical equivalent of a two input OR equation.
Note: As shown in the above examples, a reverse activated zone (Zone 208) may
reference another RZON (Zone 201) in it's equations provided that the zone that it is
referencing is numerically lower.
The "OR" function may reference any number of inputs (provided that the 14 byte
equation size limit is not exceeded). The "OR" function may also directly
reference addressable detectors and modules as shown below.
Example 2: Assume that Zone 211 is a reverse activated zone with the following Control-
By-Event equation:
OR(L1M1 L1D1 Z12 Z38)
This means that if either L1M1 (a pull station, monitor module, or XPM point) OR L1D1 (an
addressable detector) OR Zone 12, OR Zone 38 go into alarm then Zone 211 goes into
alarm. The electrical equivalent of this equation would be four normally open switches in
parallel.
AM2020/AFP1010 Troubleshooting Guide 50432 Revision A 8/13/97
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These are the zones or devices to be
"ORED" together.