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Function
Marker identification
Set Counter
Counter
not
equal to "0"
Note:
For the duration
of the first program
cycle after
the setting
of the counter,
the corresponding
marker
248 to 263 remains
at logic "0".
Counter
impulse-
Z96 - Zlll
The counter
will be decremented
by "1"
if the corres-
release
ponding
marker
has a logic state "1"
at the end of a
PLC-cycle.
In the event of the corresponding
marker
havii?g a logic state "0"
at the end of a PLC-cycle,
no
decrement
occurs.
zo-215
248 - 263
C 3)
Counters
The PLC in the TNC 150 has 16 counters
at its disposal,
each of the 16 counters
being controlled
through
two
special markers
with
the identification
Z. Whether
or not the counter
status has reached
"0" can be interrogated
by the use of an additional
marker,
also represented
by the identification
Z. The counter
is set to the entry
value
programmed
in the corresponding
machine
parameter
(max. 65535)
and counts
backwards
to the counter
status
"0".
The counter
is decremented
by 1 with
every cycle of the PLC-programme
(20 ms).
Remarks
Through
the assignment
of a logic "1 ", the corresponding
courter
will be set to the preset value in the machine
para-neter.
The assignment
of the logic "1"
must only
exist for one PLC cycle, otherwise
the setting
will be
repeiated at each subsequent
cycle.
The marker
248 - 263 corresponding
to the counter
ZO
to Z 15 is at logic "1"
when a counter
has been set. The
tour ter has been set. The counter
status can be inter-
roga.:ed via 248 to 263. On reaching
the counter
status
"0"
the marker
for the counter
status is set again to
logic "0".
Impulse
diagram
The corresponding
machine
parameter
has been set to 5 (e.g. machine
parameter
94)
Counter
status
5
13
2
2
10
Set counter
#14
Lm
Counter status
not equal to zero
Counter
impulse
release
t cm51
l&O
160
180
200
Relationship
of the counter-markers
to the machine
parameters
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