Siemens SIMATIC S5-100U System Manual page 420

Function Modules
Typical Application as "On-Delay Timer"
A timer module is mounted at slot 5. A time of 270 s is set on channel "0" of this module by means
of the time-range selector and the potentiometer. The timer is started when input 0.0 is "1".
A lamp lights up (output 4.0) when the timer has run down.
STL
The timer must not be scanned in the program scan cycle in which it was
A I 0.0
enabled since the CPU would not receive the acknowledgement that the
AN I 5.0
timer had started until one program scan later.
A F 65.0
If flag 65.0 is "1" and the timer has run down (AN I 5.0), output 4.0 is set
S Q 4.0
to "1".
A I 5.0
If the "Timer started" message has been sent to the CPU, the flag is set.
= F 65.0
AN I 0.0
If I 0.0 is "0", the lamp is switched off.
R Q 4.0
The timer is started if I 0.0 is "1".
A I 0.0
= Q 5.0
15-6
Terminal Connections
No process peripherals are connected to this
module.
Unlike the internal timers, times can be set or
modified using a timer module without
making any program modifications.
Explanation
S5-100U
EWA 4NEB 812 6120-02b