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16-9

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

C79000-G7076-C504-02

A signal state of 1 at the Enable (EN) input activates the Shift Right Double

Integer instruction. This instruction shifts the entire contents of input IN bit

by bit to the right. Input N specifies the number of bits by which to shift. If N

is larger than 32, the command behaves as if N were 32. The bit positions at

the left are padded according to the signal state of bit 31 (which is the sign of

a double integer number), that is, they are filled with zeros if the number is

positive, and with ones if it is negative. The result of the shift operation can

be scanned at output OUT.

The operation triggered by this instruction always resets the CC 0 and OV

bits of the status word to 0. If the box is executed (EN = 1), ENO shows the

signal state of the bit shifted last (same as CC 1 and RLO in the status word).

The result is that other functions following this box that are connected by the

ENO (cascade arrangement) are not executed if the bit shifted last had a

signal state of 0.

Certain restrictions apply to the placement of the Shift Right Double Integer

box (see Section 6.1).

Table 16-6 Shift Right Double Integer Box and Parameters

LAD Box Parameter Data Type Memory Area Description

SHR DI

EN BOOL I, Q, M, D, L Enable input

SHR

EN ENO

ENO BOOL I, Q, M, D, L Enable output

ENO

IN DINT I, Q, M, D, L Value to shift

OUT

N WORD I, Q, M, D, L Number of bit positions by which to shift

OUT DINT I, Q, M, D, L Result of shift operation

Status Word Bits

BR CC 1 CC 0 OV OS OR STA RLO FC

Write x x x x – x x x 1

I 0.0

A signal state of 1 at input I 0.0 activates the

instruction.

Memory double word MD0 is shifted to the right by

the number of bits specified in memory word MW4.

The result is put into memory double word MD10.

If the signal state of the bit shifted last was 1,

output Q 4.0 is set.

Q 4.0

SHR_DI

OUT

MW4

Function is executed (EN = 1):

MD10

MD0

EN ENO

Figure 16-8 Shift Right Double Integer

Shifting Right

Double Integer

Shift and Rotate Instructions

1 2 ... 208 209 210 211 212 213 214 215 216 217 218 ... 317 318

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