Timer Operations - Siemens SIMATIC S5-100U System Manual

S5-100U
8.1.4

Timer Operations

The program uses timer operations to implement and monitor chronological sequences. Table 8-4
provides an overview of timer operations. Examples follow the table.
Operation Operand
SP
SE
SD
SS
SF
R
ID
T
EWA 4NEB 812 6120-02b
Table 8-4. Overview of Timer Operations
Pulse Timer
The timer is started on the leading edge of the RLO.
When the RLO is "0", the timer is set to "0".
Scans result in signal state "1" as long as the timer is running.
Extended Pulse Timer
The timer is started on the leading edge of the RLO.
When the RLO is "0", the timer is not affected.
Scans result in signal state "1" as long as the timer is running.
On-Delay Timer
The timer is started on the leading edge of the RLO.
When the RLO is "0", the timer is set to "0".
Scans result in signal state "1" when the timer has run out and the
RLO is still pending at the input.
Stored On-Delay Timer
The timer is started on the leading edge of the RLO.
When the RLO is "0", the timer is not affected.
Scans result in signal state "1" when the timer has run out.
The signal state becomes "0" when the timer is reset with the "R"
operation.
Off-Delay Timer
The timer is started on the trailing edge of the RLO.
When the RLO is "1", the timer is set to its initial value.
Scans result in signal state "1" as long as the RLO at the input is
"1" or the timer is still running.
Reset Timer
The timer is reset to its initial value as long as the RLO is "1".
When the RLO is "0", the timer is not affected.
Scans result in signal state "0" as long as the timer is reset or has
not been started yet.
Parameter CPU 100
0 to 15
STEP 5 Operations
Meaning
CPU 102
0 to 31
CPU 103
0 to 127
8-15