Siemens SIMATIC S5-115U, Руководство пользователя

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S5-115U Manual STEP 5 Operations
8.1.5 Counter Operations
The CPU uses counter operations to handle counting jobs directly. Counters can count up and
down. The counting range is from 0 to 999 (three decades). Table 8-5 provides an overview of the
counter operations. Examples follow the table.
Table 8-5. Overview of Counter Operations
Operation Meaning
Set Counter
The counter is set on the leading edge of the RLO.
Parameter
0 to 127
Operand
S
R Reset Counter
The counter is set to zero as long as the RLO is "1".
Count Down
The count is decremented by 1 on the leading edge of the RLO.
When the RLO is "0", the count is not affected.
ID
C
CD
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a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
CU Count Up
The count is incremented by 1 on the leading edge of the RLO.
When the RLO is "0", the count is not affected.
Loading a Count
Counter operations call internal counters.
When a counter is set, the word in ACCUM 1 is used as a count. You must therefore first store
counts in the accumulator.
You can load a count with any of the following data types
KC constant count
or
DW data word
IW input word
QW output word
FW flag word.
The data for these words must
be in BCD code.
EWA 4NEB 811 6130-02b
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