Examples for Instruction Lists (IL)
SICAM A8000 / CP-8000 • CP-8021 • CP-8022 Manual Unrestricted 549
DC8-037-2.02, Edition 10.2017
B.5 Bounce Suppression
If an input signal is bouncing, the blocked bit (BL) is set. The number of state changes until
the BL bit is set, as well as the monitoring time during which the information must be static un-
til the BL bit is reset, are adjustable via constants. An output is set to 0 during the BL bit is set.
With an edge detection for the rising edge (R_TRIG_INEDRISE0) and the falling edge
(F_EDTIMEFALL0) the counter (CTU_EDC0) will be incremented by 1. At the same time the R
input of the counter is reset via an ON delay for the rising edge (TON_EDTIMERISE0) as well
as for the falling edge (TON_EDTIMEFALL0). With this function all state changes of the input
will be integrated by the counter (started with the first edge and triggered by each following
one).
As soon as a state change of the input happens the flag (M_BOOL_COUNTER00) is reset and
the input of an AND (module 8) is set (inverted). If the sum of state changes is greater as or
equal to a defined number (CV>=PV) the counter output is set as well, and the BL bit is set.
With the set BL bit the output is reset by another AND (module 9).
After termination of the monitoring time the R input of the counter is set again, and the counter
is reset. If the BL bit is set, it will be reset as well (output of module 8 is 0).
In the procession sequence the R input of the counter must be reset first, because only after-
wards the positive edge at the CU input of the counter causes an increment. Therefore the ap-
plication program handles the R input before the CU input of the counter.
TON
TON
&
&
Parameter
1
1
CU
PV
R
Q
CTU_FLZ0
1
2
3
4
5
6
7
8
9
input
in the INIT part
R_TRIGINEDRISE0
F_TRIG_INEDFALL0
TON_EDTIMERISE0
TON_EDTIMEFALL0
M_BOOL_COUNTER00
M_BOOL_MODULE7
output
counter
upward
M_BOOL_MODULE03
blocked
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