Engineering
30
04/99 AWB 2700-1311 GB
Recording fast pulse trains (high-speed counter)
The PS 4-300 can be used to record pulse trains with
an input frequency of up to 50 kHz.
왘 Apply the counting signal to input I0.0.
왘 Determine the counting direction via input I0.1.
The counting direction is determined as follows: if
there is a high signal at input I 0.1, the count is
incremented, if the signal is low, the count is
decremented.
The counter status can be scanned using the
operands ICW, ICD, ICPW, ICPD and then further
processed in the application program.
Avoiding interference Cabling and wiring
Cables should be divided into the following
categories:
Power cables (e.g. heavy current cables or cables
to current converters, contactors or solenoid
valves)
Control and signal cables
(e.g. digital input cables)
Measuring and signal cables
(e.g. fieldbus cables).
Power, control and signal cables must be laid as
far apart from each other as possible in order to
prevent capacitive and inductive coupling. If
separate cabling is not possible, then those
cables that are the interference source must be
screened without fail.
H1311g.bk Seite 30 Freitag, 4. Juni 1999 1:12 13
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