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14-2

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

C79000-G7076-C504-02

14.1 Assign a Value

The Assign a Value instruction enables you to pre-assign a variable with a

specific value.

The value specified at the IN input is copied to the address specified at the

OUT output. ENO has the same signal state as EN.

With the MOVE box, the Assign a Value instruction can copy all data types

that are 8, 16, or 32 bits in length. User-defined data types such as arrays or

structures have to be copied with the Direct Word Move integrated system

function (see the Programming Manual /234/).

The Assign a Value instruction is affected by the Master Control Relay

(MCR). For more information on how the MCR functions, see Section 20.5.

Certain restrictions apply to the placement of the Assign a Value box (see

Section 6.1).

Table 14-1 Assign a Value Box and Parameters

LAD Box Parameter Data Type Memory Area Description

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

MOVE

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

MOVE

EN ENO

All data types that

are 8, 16, and 32

bits in length

I, Q, M, D, L Source value

IN OUT

OUT

All data types that

are 8, 16, and 32

bits in length

I, Q, M, D, L Destination address

I 0.0

The instruction is executed if the signal

state of input I 0.0 is 1. The content of

memory word MW10 is copied to data

word 12 of the open DB.

Output Q 4.0 is 1 if the operation is

executed.

Q 4.0

MOVE

IN OUT

EN ENO

MW10 DBW12

Status Word Bits

BR CC 1 CC 0 OV OS OR STA RLO FC

Write 1 – – – – – 1 1 x

Function is executed (EN = 1):

Figure 14-1 Assign a Value

Description

Move and Conversion Instructions

1 2 ... 175 176 177 178 179 180 181 182 183 184 185 ... 317 318

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