196 SCS Series Manual — P/N 15712:L 7/18/16
AM2020/AFP1010 Control-By-Event The Null Control-By-Event
By using two reverse-activating zones, the equation with 15 bytes is broken into two smaller Equations and the CBE for the control module
uses the two reverse-activating zones as its operands.
CBE Equation for Z238:
OR(Z1 Z2 Z3 Z4 Z5 Z6 Z7 Z8)
= 10 Bytes
CBE Equation for Z239:
OR(Z9 Z10 Z11 Z12 Z13 Z14)
= 8 Bytes
CBE Equation for L1M1:
OR(Z238 Z239)
= 4 Bytes
A.5 The Null Control-By-Event
The simplest type of Control-By-Event is the Null, which means empty.
For initiating devices, the Null is denoted by entering ( ) as the Control-By-Event.
In response to an alarm on a device programmed with a Null Control-By-Event, the AM2020/AFP1010 will do the following:
• Initiate a System Alarm condition (Alarm LED flashes, piezo chirps and the Form-C alarm contacts on the CPU will be activated).
• Activate no control modules or software zones (no notification appliances will sound and no output relays will be activated due to the
fact that there are no entries in the Control-By-Event for this initiating device).
For Output Devices, the Null is denoted by entering OR( ) or ( )
Programming Shortcut: Entering ( is equivalent to entering OR(
Z4
Z5
Z2
Z7 Z8
Z13
Z10
Z11
Z3
Z6
Z14Z1
Z9
Z12
Z239
RZON
Z240
RZON
L1M1
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