Siemens SIMATIC S5-90U, Системное руководство

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S5-90U/S5-95U STEP 5 Operations
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.
Table 8-4. Overview of Timer Operations
Operation Meaning
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.
Parameter S5-90U S5-95U
0 to 31 0 to 127
Operand
SP
SE 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.
ID
T
SD
SS
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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.
SF
R
Note
To increase the performance of the S5-95U
•
Use timers in ascending order,
• Assign only those timers you really need in DB1 (see Section 6.5).
EWA 4NEB 812 6115-02b
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