Siemens NAN 67 Series Wartungshandbuch Seite 129

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9-7
Ladder Logic (LAD) for S7-300 and S7-400
C79000-G7076-C504-02
9.4 Extended Pulse S5 Timer
The Extended Pulse S5 Timer instruction starts a specified timer if there is a
positive edge (that is, a change in signal state from 0 to 1) at the Start (S)
input. A signal change is always necessary to start a timer. The timer
continues to run with the specified time at the Time Value (TV) input, even if
the signal state at the S input changes to 0 before the time has elapsed. A
signal state check for 1 at output Q produces a result of 1 as long as the timer
is running. The timer is restarted with the specified time if the signal state at
input S changes from 0 to 1 while the timer is running.
A change from 0 to 1 at the Reset (R) input of the timer while the timer is
running resets the timer. This change also resets the time and the time base to
zero.
The actual time value can be scanned at the outputs BI and BCD. The time
value at BI is in binary coded format; at BCD it is in binary coded decimal
format.
Table 9-5 Extended Pulse S5 Timer Box and Parameters, with International Short Name
LAD Box
Parameter Data Type Memory Area Description
T no.
no. TIMER T
Timer identification number. The
range depends on the CPU.
S_PEXT
S BOOL I, Q, M, D, L, T, C Start input
SQ
TV S5TIME I, Q, M, D, L Preset time value (range 0 to 9999)
BCD
S
TV BI
Q
R BOOL I, Q, M, D, L, T, C Reset input
BCD
R
Q BOOL I, Q, M, D, L Status of the timer
R
BI WORD I, Q, M, D, L Remaining time value (integer format)
BCD WORD I, Q, M, D, L Remaining time value (BCD format)
Table 9-6 Extended Pulse S5 Timer Box and Parameters, with SIMATIC Short Name
LAD Box Parameter Data Type Memory Area Description
T no.
no. TIMER T
Timer identification number. The
range depends on the CPU.
S_VIMP
S BOOL I, Q, M, D, L, T, C Start input
SQ
TW S5TIME I, Q, M, D, L Preset time value (range 0 to 9999)
DEZ
S
TW DUAL
Q
R BOOL I, Q, M, D, L, T, C Reset input
DEZ
R
Q BOOL I, Q, M, D, L Status of the timer
R
DUAL WORD I, Q, M, D, L Remaining time value (integer format)
DEZ WORD I, Q, M, D, L Remaining time value (BCD format)
Description
Timer Instructions
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