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PAGE 60 1010/2020 INSTALLATION AND PROGRAMMING MANUAL

COOPERATIVE CONTROL-BY-EVENT

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 1010/2020 will do the following:

• Initiate a System Alarm condition (Alarm LED flashes and the piezo sounds).

• Activate no control modules or software zones (no output 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 ( ).

Note: Entering just an open bracket “(“ is equivalent to entering “OR (“. A control module

programmed with a Null Control-By-Event will not be activated unless it is included in the Control-

By-Event of a software zone or initiating device.

C.B.E PROGRAMMING EXAMPLES

C.B.E Equations

The examples below illustrate the effective use of Control by Event Equations, and the flexibility to

carry out any function.

Combinational Logic

Example # 1:

L1D1, L1D2, and L1D3 activate Z1.

L1D4 activates Z2.

If Z1 activates,

L1M1 will activate.

If Z2 activates

L1M4 will activate.

The equation AND(Z1 Z239) requires

both to be active for an output.

Because reverse zone 239 has a NOT operand,

it is active as long as L1D4 is NOT active.

Notifier 1010 User Manual

Questions and Answers: