(1) Description of Operation 7SR224
Page 50 of 66 ©2009 Siemens Protection Devices Limited
4.4 QUICK LOGIC
The ‘Quick Logic’ feature allows the user to input up to 16 logic equations (E1 to E16) in text format.
Equations can be entered using Reydisp or at the relay fascia.
Each logic equation is built up from text representing control characters. Each can be up to 20
characters long. Allowable characters are:
0, 1, 2, 3, 4, 5, 6, 7, 8, 9 Digit
( ) Parenthesis
! ‘NOT’ Function
. ‘AND’ Function
^ ‘EXCLUSIVE OR’ Function
+ ‘OR’ Function
En Equation (number)
Fn Function Key (number)
‘1’ = Key pressed, ‘0’ = Key not pressed
In Binary Input (number)
‘1’ = Input energised, ‘0’ = Input de-energised
Ln LED (number)
‘1’ = LED energised, ‘0’ = LED de-energised
On Binary output (number)
‘1’ = Output energised, ‘0’ = Output de-energised
Vn Virtual Input/Output (number)
‘1’ = Virtual I/O energised, ‘0’ = Virtual I/O de-energised
Example Showing Use of Nomenclature
E1= ((I1^F1).!O2)+L1
Equation 1 = ((Binary Input 1 XOR Function Key 1) AND NOT Binary Output 2)
OR
LED 1
When the equation is satisfied (=1) it is routed through a pick-up timer (En Pickup Delay), a drop-off
timer (En Dropoff Delay), and a counter which instantaneously picks up and increments towards its
target (En Counter Target).
The counter will either maintain its count value En Counter Reset Mode = OFF, or reset after a time
delay:
En Counter Reset Mode = Single Shot: The En Counter Reset Time is started only when
the counter is first incremented (i.e. counter value = 1) and not for subsequent counter
operations. Where En Counter Reset Time elapses and the count value has not reached its
target the count value is reset to zero.
En Counter Reset Mode = Multi Shot: The En Counter Reset Time is started each time the
counter is incremented. Where En Counter Reset Time elapses without further count
increments the count value is reset to zero.
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