Siemens SIMATIC S5-90U System Manual page 184

STEP 5 Operations
Loading a Time
Timer operations call internal timers.
When a timer operation is started, the word in ACCU 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 wort
QW output word
FW flag word
Loading a Constant Time Value:
The following example shows how you can load a time value of 40 s.
L KT 40.2
Key for Time Base:
Base 0
Factor 0.01 s
8-16
These data types must be
in BCD code.
Operation
Operand
Coded time base (0 to 3)
Time (0 to 999)
1 2 3
0.1 s 1 s 10 s
S5-90U/S5-95U
EWA 4NEB 812 6115-02b