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F3200 Installation & Programming Manual Document No: LT0122
Programming System Configuration
Page 7-24 5 July 2001 Issue 2.7
EXAMPLES OF LOGIC EQUATIONS (CONTINUED)
Example 4 - Use of Timer To Make Continuous Pulsing
A building has a loud "hooter" to attract the operator to the FIP. The hooter is relay driven
and must pulse 1 second on, 1 second off, on occurrence of any alarm until it is
acknowledged.
Solution:
Use a timer to make a 1 second on, 1 second off oscillator. A relay (say Anc2) and a timer
(say T1) are assigned. The MUA (MAF unacknowledged alarm) is used as follows:
T1[S1:1] = ^T1
MUA
ANC2 = T1.MUA
↑ ↑
ALARM ACKNOWLEDGE
7.4.5 ENTERING EQUATIONS
Entering equations from the keypad is similar to entering text, but includes entering logical
operators and brackets from specific keys.
When an output (e.g. Relay 01) is selected, press "EDIT", "ENTER" or """ to enable
equation entry for that output.
Equation entry has two fields. The top field contains the equation which has been entered
and the bottom field contains an array of operands which may be entered. "NOT" or "(" may
also be entered directly from their keys.
Each field has one of two cursors. The active cursor █ may be moved through the field it is
in by use of the ! " cursors to select an operand or position in the equation. The inactive
cursor $ shows where the active cursor would be if it was in that field.
There is a choice of 5 lines of operands in the bottom field. These may be scrolled by use of
the # and % keys. Note that numbers and operators can be entered directly from the
keypad.
"EDIT" toggles the cursor between the two fields.
"DELETE" acts as backspace for a token just entered, or deletes any token/operator in
the equation selected by the cursor (active or inactive).
"ACK" saves the equation.
"NEXT" & step through outputs (e.g. relays).
"PREV"
Notes:
1. Observe the priorities specified in Section 7.4.2.
2. It is recommended that brackets be used when entering a string of operands to make
checking easier.