S5-115F Manual STEP 5 Operations
3.1.5 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 3-5 provides an overview of the
counter operations. Examples follow the table.
Table 3-5. 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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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.
Loading a constant count:
The following example shows how the count 37 is loaded.
LKC 37
Operation
Operand
Count (0 to 999)
EWA 4NEB 811 6149-02
3-25
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