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Chapter 9
133
Logic programming – Function blocks
Truth table for the RS Flip-Flop function block
The following applies for the truth table in this section:
“0” means logic Low.
“1” means logic High.
“n–1” references the preceding value.
“n” references the current value.
“x” means “any” = “0” or “1”.
Set
Reset
Output Q
n–1
Output Q
n
Output /Q
n
0
0 0 0 1
0
0 1 1 0
0
1 x 0 1
1
0 x 1 0
1
1 x 0 1
9.7.8 JK
Flip-Flop
Function block diagram
General description
The JK Flip-Flop function block has three inputs. The
J input
and
K input
have only
an effect on the outputs when a rising edge is detected at the
Clock input
. In this
case …
If
J input
is High and
K input
is Low, the
Q
output will be High and the
/Q
(= Q
inverted) output will be Low.
If
J input
is Low and
K input
is High, the
Q
output will be Low and the
/Q
output will
be High.
If both inputs are Low, the last values of outputs
Q
and
/Q
will be held.
If both inputs are High, the outputs will toggle, i.e. their last values will be inverted.
Parameters of the function block
Parameter
Possible values
Number of outputs
1 (Q)
2 (Q and /Q)
Invert J input
Each input of this function block can be inverted (see Section 9.5.2).
Invert Clock input
Invert K input
Table 34:
Truth table for the RS Flip-
Flop function block
Figure 106:
Function block diagram for
the JK Flip-Flop function
block
Table 35:
Parameters of the JK Flip-
Flop function block
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