Rockwell-automation 1771-N SERIES High Resolution Analog Module User M Instrukcja Użytkownika Pobierz pdf (Strona 38)

3–6 Communicating With Your Analog Module

Publication 1771ĆUM127B-EN-P - December 2002

Modules without output channels do not require rungs 2 and 3.

Instead, move the input condition instructions from rung 2 to the

front of rung 4, and specify the BTW length equal to 59.

Sample Ladder Diagram Ć PLCĆ5 Family Processors

The following PLC-5 program is very similar to the preceding

PLC-3 program with the following exceptions:

• You use enable bits instead of done bits as the conditions on each

rung.

• A separate control file must be selected for each of the block

transfer instructions.

Figure 3.5

PLCĆ5 Family Example Program Structure

BTR

BLOCK XFER READ

RACK:

GROUP:

MODULE:

CONTROL:

N10:0

DATA FILE:

LENGTH:

CONTINUOUS:

N10:10

BTR Enable

BTW

BLOCK XFER WRITE

RACK:

GROUP:

MODULE:

CONTROL:

N10:5

DATA FILE:

LENGTH:

CONTINUOUS:

N10:80

15 15

BTW

Enable

BTW Enable

CPT

COMPUTE

DEST

EXPRESSION

N10:6

00 15

BTW

Enable

Pushbutton

Powerup Bit

* Length = (number of outputs + 1) words.

For 2 output/6 input modules, this would be equal to 3.

BTR

Enable

N10:0 N10:5

N10:11

I:007 N10:5

N10:0 N10:5

CPT

COMPUTE

DEST

EXPRESSION

N10:6

00 15

BTW

Enable

Pushbutton

I:007 N10:5

For the following example, assume the analog module is physically located at rack address 01, module group 00, module sl

and the input module connected to the pushbutton is located at rack address 00, module group 7, slot 6. The block transfer

data files correspond to the example on the following pages.

Modules without output channels do not require rungs 2 and 3. Instead, move

the input

condition instructions (pushbutton and powerup) from rung 2 to the front of rung

4, and specify the BTW length equal to 59.

Powerup Bit

N10:11

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 187 188

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