S5-100U STEP 5 Operations
8.1.5 Counter Operations
The programmable controller uses counter operations to handle counting jobs. 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 CPU 100 CPU 102 CPU 103
0 to 15 0 to 31 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
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 ACCU 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 812 6120-02
8-25
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