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9-9

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

C79000-G7076-C504-02

9.5 On-Delay S5 Timer

The On-Delay 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 as long

as the signal state at input S is 1. A signal state check for 1 at output Q

produces a result of 1 when the time has elapsed without error and when the

signal state at input S is still 1. When the signal state at input S changes from

1 to 0 while the timer is running, the timer is stopped. In this case, a signal

state check for 1 at output Q always produces the result 0.

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 timer is also reset if the signal state is 1 at the R input while the

timer is not running.

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 9-7 On-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.

S_ODT

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

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

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 9-8 On-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.

S_EVERZ

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

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

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 ... 126 127 128 129 130 131 132 133 134 135 136 ... 317 318

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