S5-115F Manual STEP 5 Operations
Loading a time
Timer operations call internal timers.
When a timer operation is started, the word in ACCUM 1 is used as a time value.
You must therefore first specify time values in the accumulator.
You can load a timer with any of the following data types:
KT constant time value
or
DW data word
IW input word
QW output word
FW flag word
These data types must be
in BCD code.
Loading a constant time value
The following example shows how you can load a time value of 40 sec.
L KT 40.2
Operation
Operand
Coded time base (0 to 3)
Time (0 to 999)
Key for time base:
Base 0 1 2 3
Factor 0.01 sec. 0.1 sec. 1 sec. 10 sec.
Example: KT 40.2 corresponds to 40 x 1 sec.
Tolerances:
The time tolerance is calculated as the sum of the time base and the maximum interval between
the FB 254 SYNC synchronization block calls.
OperandExamples Time Interval
400 x 0.1 sec.± 0.1 sec. 39.9 sec. ... 40.1 sec.
40 x 1 sec. ± 1 sec. 39 sec. ... 41 sec.
4 x 10 sec. ± 10 sec. 30 sec. ... 50 sec.
KT 400.1
KT 40.2
KT 4.3
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Possible settings
for the time
40 sec.
Note
Always use the smallest time base possible. You achieve more accurate times in this
way.
EWA 4NEB 811 6149-02
3-17
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