Siemens NAN 67 Series Manual de servicio descargar pdf (Pagina 135)

9-13

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

C79000-G7076-C504-02

9.7 Off-Delay S5 Timer

The Off-Delay S5 Timer instruction starts a specified timer if there is a

negative edge (that is, a change in signal state from 1 to 0) at the Start (S)

input. A signal change is always necessary to start a timer. The result of a

signal state check for 1 at output Q is 1 when the signal state at the S input is

1 or when the timer is running. The timer is reset when the signal state at

input S goes from 0 to 1 while the timer is running. The timer is not restarted

until the signal state at input S changes again from 1 to 0.

A change from 0 to 1 at the Reset (R) input of the timer while the timer is

running resets the timer.

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.

Certain restrictions apply to the placement of timer boxes (see Section 6.1).

Table 9-11 Off-Delay 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.

T no.

S_OFFDT

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

OFFDT

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

TV BI

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

BCD

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 9-12 Off-Delay 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.

T no.

S_AVERZ

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

AVERZ

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

DUAL

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

DEZ

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 ... 130 131 132 133 134 135 136 137 138 139 140 ... 317 318

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