Siemens NAN 67 Series Manual de Serviço descarregar pdf (Página 127)

9-5

Ladder Logic (LAD) for S7-300 and S7-400

C79000-G7076-C504-02

9.3 Pulse S5 Timer

The 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 until the programmed

time elapses, as long as the signal state at input TV is 1. While the timer is

running, a signal state check for 1 at output Q produces a result of 1. If there

is a change from 1 to 0 at the S input before the time has elapsed, the timer is

stopped. Then a signal state check for 1 at output Q produces a result of 0.

While the timer is running, a change from 0 to 1 at the Reset (R) input of the

timer resets the timer. This change also resets the time and the time base to

zero. A signal state of 1 at the R input of the timer has no effect if the timer

is not running.

The actual time value can be scanned at outputs BI and BCD. The time value

at BI is in binary coded format; at BCD it is in binary coded decimal format.

Table 9-3 Pulse S5 Timer Box and Parameters, with International Short Name

LAD Box

Parameter Data Type Memory Area Description

T no.

S PULSE

no. TIMER T

Timer identification number. The

range depends on the CPU.

S_PULSE

S BOOL I, Q, M, D, L, T, C Start input

TV BI

TV S5TIME I, Q, M, D, L Preset time value (range 0 to 9999)

BCD

TV BI

R BOOL I, Q, M, D, L, T, C Reset input

Q BOOL I, Q, M, D, L Status of the timer

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 9-4 Pulse S5 Timer Box and Parameters, with SIMATIC Short Name

LAD Box Parameter Data Type Memory Area Description

T no.

S IMPULS

no. TIMER T

Timer identification number. The

range depends on the CPU.

S_IMPULS

S BOOL I, Q, M, D, L, T, C Start input

TW DUAL

TW S5TIME I, Q, M, D, L Preset time value (range 0 to 9999)

DEZ

TW DUAL

R BOOL I, Q, M, D, L, T, C Reset input

Q BOOL I, Q, M, D, L Status of the timer

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

1 2 ... 122 123 124 125 126 127 128 129 130 131 132 ... 317 318

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