Siemens SIMATIC S5 Manual page 125

Programming the IP 265 with COM 265
Timer operations
Starting a delay timer "SD":
Each signal change from "0" to "1" at the Start input
starts the timer, which runs until the Start signal is
"0", the set time has expired or the timer is reset.
Output Q goes to "1" when the timer has run down,
the Start signal is "1" and the Reset signal is "0".
Example: Output Q 0.5 is set 50 ms after input
I 0.0, and remains set as long as the
input is "1".
Starting a latching ON delay timer "SS":
The timer is started each time the signal at the Start
input changes from "0" to "1", and runs until the set
time has expired or the timer is reset. If a rising signal
edge is detected at the Start input before the set time
has expired, the timer is restarted.
Output Q goes to "1" when the timer has run down
and the Reset signal is "0".
Example: Output 0.5 is set 50 ms after input I 0.0
is set.
9-20
Table 9-8. Timer Operations (continued)
CSF (example)
T!-!0
> S
I 0.0
KT 5.0 TV
R Q
Timing diagram
Signal states
1
0
1
0
50
T!-!S
> S
I 0.0
KT 5.0 TV
R Q
I 0.1
Timing diagram
Signal states
1
0
1
0
1
0
50
EWA 4NEB 812 6130-02a
IP 265
Q 0.5
I 0.0
Q 0.5
50 Time in ms
Q 0.5
I 0.0
I 0.1
Q 0.5
50 Time in ms