Program Custom Control Equations - Simplex 4010 Applications Manual

Dual Detector, Pre-Signal, and Abort Switch with Delay,
Program Custom Control
Equations
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The eight Custom Control equations required to program this application are
shown in Figure 3-7. These equations have the following functions.
Equation 1. This equation contains two input qualifiers and a single output
qualifier. The first input qualifier in this equation monitors the state of list L26.
If two detectors within this list are in the FIRE state, the remainder of the
equation executes. The second input qualifier, which executes only if the first
input qualifier is true (i.e., two detectors are activated), starts a running timer of
30 seconds. The output qualifier at the bottom of the first equation, which also
executes only if the first input qualifier is true, turns P80 on.
Equation 2. The first input qualifier monitors the state of List L28, which
contains all manual release stations (pull stations) in the suppression release
area. The second input qualifier and the output qualifier at the bottom of
Equation 2 execute only if the first input qualifier is true. The second input
qualifier starts a running timer of five seconds. The output qualifier at the
bottom of the equation turns P81on.
Equation 3. The first input qualifier checks to see whether an abort switch is
active. It does this by checking to see whether any point within list L27, which
contains all abort switch points, is in a supervisory state. (Note that these points
must have a point type of SUPABRT for this to occur.) The second input
qualifier, which is linked to the first by an AND logical operator, determines
whether two detectors are in an activated state. Because the first two input
qualifiers are separated by the AND operator, they both must be true (i.e., an
abort switch must be active while two detectors are in an activated state) for the
equation's two output qualifiers to execute. If the inputs are both true, the first
output qualifier holds pseudo point P82 ON and the second output qualifier
tracks ON P83. (Understanding the function of this last output qualifier is very
important. Because it uses TRACK ON, P83 turns on when both input
qualifiers are true, and turns off when either one of the input qualifiers is false.)
Equation 4. The first input qualifier checks pseudo point P82, which is ON
only if Equation 3's input qualifiers are both true (i.e., abort switch is active and
two detectors in the suppression area are active at the same time). The second
input qualifier, which is linked to the first input by the logical AND operator,
checks P83. This input is true only if P83 is NOT in its ON/CODING state (i.e.,
switch is not being held in). The third input qualifier starts a running timer of 10
seconds. The output qualifer turns P84 on, which indicates that the timer is
running.
Equation 5. The four input qualifiers in this expression are linked via logical
operators. The output qualifier (which holds on the suppression release circuits)
in this equation executes if the following occurs:
- Two detectors are active (i.e., P80 is ON) AND the abort switch is not
active (P82 cannot be in the ON/CODING state).
- OR a pull station is active (P81 is ON).
- OR P84 is on (i.e., the abort switch delay timer has expired).
3-10
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