User manual

Exorcist User Manual

NOR

Trigger 1

Trigger 2

Output

Off

NOR is another way of saying if this AND that are OFF, where AND is saying if this

AND that are ON lets look at the routine again using NOR

VSA 1

Trigger: - Function 1 ON

Reset: - Timer 1 Done

VSA 2

Trigger: - Function 2 ON

Reset: - Timer 1 Done

Timer 1

Trigger: - Function 3 ON

Reset: - Timer 1 Done

Dwell: - 100

Function 1

Condition 1: - Input 1 OFF

Condition 2: - VSA 2 Active

Operator: - NOR

Function 2

Condition 1: - Input 2 OFF

Condition 2: - VSA 1 Active

Operator: - NOR

Function 3

Condition 1: - VSA 1 Done

Condition 2: - VSA 2 Done

Operator: - OR

Please note that this routine is the same length as 7, but now the logic may appear to

be incomprehensible. This is known as negative logic and it’s the stuff that can easily

give you a headache

Looking back at the truth table Functions 1 and 2 will only trigger if both conditions

are OFF, this means the VSA routine needs to not be playing and the Input n OFF flag