Siemens NAN 67 Series Manual de servicio descargar pdf (Pagina 140)

10-4

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

C79000-G7076-C504-02

Table 10-2 Up-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.

Zno

ZV BOOL I, Q, M, D, L Count up input ZV

Z no.

ZAEHLER

ZR BOOL I, Q, M, D, L Count down input ZR

ZAEHLER

QZV

S BOOL I, Q, M, D, L Set input for presetting counter

DUAL

QZV

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)

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)

A change in signal state from 0 to 1 at input

I 0.2 sets counter C 10 with the value 55 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 increased by 1, except when

the value of counter C 10 is equal to 999. If

input I 0.1 changes from 0 to 1, counter C 10 is

decreased by 1, except when the value of

counter C 10 is equal to 0. If I 0.3 changes from

0 to 1, the value of C 10 is set to 0.

Q 4.0 is 1, when C 10 is not equal to “0”.

Status Word Bits

BR CC 1 CC 0 OV OS OR STA RLO FC

Write – – – – – x x x 1

C 10

S_CUD

CV_BCD

I 0.0

Q 4.0

I 0.1

I 0.2

C#55

I 0.3

Figure 10-2 Up-Down Counter

Counter Instructions

1 2 ... 135 136 137 138 139 140 141 142 143 144 145 ... 317 318

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