STEP 5 Operations S5-95F
8.5 Sample Programs
Sections 8.5.1 through 8.5.3 provide a few sample programs that you can enter and test in all three
methods of representation on a programmer.
8.5.1 Momentary-Contact Relay/Edge Evaluation
F 2.0
F 64.0
F 64.0 F 2.0
(#)
S
R
Q
I 0.0
I 0.0
LAD
Circuit Diagram
STL CSF
Example
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A I 0.0
AN F 64.0
= F 2.0
S F 64.0
AN I I0.0
R F 64.0
NOP 0
I 0.0
F 2.0
I 0.0 &
(#)
I 0.0
F 64.0
F 64.0
F 64.0
S
R
Q
On each leading edge of the signal at input I 0.0, the AND
condition “A I 0.0 and AN F 64.0” is satisfied; the RLO is “1”.
This sets flags F 64.0 and F 2.0 (“edge flags”).
In the next processing cycle, the AND condition “A I 0.0 and
AN F 64.0” is not satisfied since flag F 64.0 has already been
set.
Flag 2.0 is reset.
Therefore, flag F 2.0 is “1” for only one program run.
When input I 0.0 is switched off, flag F 64.0 is reset.
This resetting prepares the way for evaluation of the next
leading edge of the signal at input I 0.0.
F 2.0
I 0.0
8.5.2 Binary Scaler/Binary Divider
This section describes how to program a binary scaler.
Example: The binary scaler (output Q 1.0) changes its state each time I 0.0 changes its signal
state from “0” to “1” (leading edge). Therefore, half the input frequency appears at the
output of the flip-flop.
8-70
EWA 4NEB 812 6210-02
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