Siemens NAN 67 Series Manual de servicio descargar pdf (Pagina 144)

10-8

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

C79000-G7076-C504-02

Table 10-6 Down Counter Box and Parameters, with SIMATIC Short Name

LAD Box Parameter Data Type Memory Area Description

no. COUNTER C

Counter identification number. The range

depends on the CPU.

Z no.

Z RUECK

ZR BOOL I, Q, M, D, L

Count down input ZR

RUECK

QZR

S BOOL I, Q, M, D, L

Set input for presetting counter

DUAL

QZR

ZW WORD I, Q, M, D, L

Value in the range of 0 to 999 for

presetting counter (entered as

C#<value> to indicate BCD format)

DUAL

DEZ

R BOOL I, Q, M, D, L

Reset input

Q BOOL I, Q, M, D, L

Status of the counter

DUAL WORD I, Q, M, D, L

Current counter value (integer format)

DEZ WORD I, Q, M, D, L

Current counter value (BCD format)

Status Word Bits

BR CC 1 CC 0 OV OS OR STA RLO FC

Write – – – – – x x x 1

A change in signal state from 0 to 1 at input I 0.2

sets counter C 10 with the value 89 in binary

coded decimal format. If the signal state of input

I 0.0 changes from 0 to 1, the value of counter

C 10 is decreased by 1, unless the value of

counter C 10 is equal to 0. The signal state of

output Q 4.0 is 1 if counter C 10 is not equal to 0.

If I 0.3 changes from 0 to 1, the value of C 10 is

set to 0.

C 10

S_CD

CV_BCD

I 0.0

Q 4.0

I 0.2

C#89

I 0.3

Figure 10-4 Down Counter

Counter Instructions

1 2 ... 139 140 141 142 143 144 145 146 147 148 149 ... 317 318

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Siemens NAN 67 Series Manual de servicio Pagina 144

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