Rockwell-automation 1771-IFE , D17716.5.90 USER MNL. ANALOG INPUT Modu Manual de usuario descargar pdf (Pagina 28)

Module Programming

Chapter 3

3-4

The PLC-5 program is very similar to the PLC-3 program with the

following exceptions:

1. You must use enable bits instead of done bits as the conditions on

each rung.

2. A separate control file must be selected for each of the block transfer

instructions. Refer to Appendix B.

Figure 3.3

PLC5

Family Sample Program Structure

BTR Enable

Pushbutton

Power-up Bit

BTW Enable

Bit

BTR

BLOCK TRANSFER READ

RACK:

GROUP:

MODULE:

CONTROL:

DATA FILE:

LENGTH:

CONTINUOUS:

BTW

BLOCK TRANSFER WRITE

RACK:

GROUP:

MODULE:

CONTROL:

DATA FILE:

LENGTH:

CONTINUOUS:

XX:XX

10956I

Program Action

Rungs 1 and 2

At powerup, the program enables a block

transfer read and examines the powerup bit

in the BTR file (rung 1). Then, it initiates one

block transfer write to configure the module

(rung 2). Thereafter, the program continuously

reads data from the module (rung 1).

A subsequent BTW operation is enabled by a

pushbutton switch (rung 2). Changing

processor mode will not initiate a block

transfer write.

PLC5 Programming

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Rockwell-automation 1771-IFE , D17716.5.90 USER MNL. ANALOG INPUT Modu Manual de usuario Pagina 28

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