Rockwell-automation 1747-DSN DISTRIBUTED I/O SCANNER Manual de usuario descargar pdf (Pagina 30)

Chapter 3

Configuration and Programming

3–12

Programming Example Using 7 I/O block Configuration

In the following programming example, the first rung is used to initiate the

DIO system using the Output Control Word. The scanner is located in slot 1

and an alarm is connected to a discrete I/O card in slot 2. When the water

level drops, the switch closes and the pump starts pumping water into the

tower.

The Communications Status Bit for I/O block 1 is used to ensure that input

data from the I/O block is valid before the pump can be turned on (rung 5).

It is also used to turn on the alarm if communication with the I/O block is

lost for more than 6 seconds (rungs 3 and 4).

MVM

MOVE

Source N7:01

Mask 1F

Dest O:1.00

(U)

O:2.0

] [

S:1

] [

S:1

(L)

O:1.0

(U)

O:1.0

TON

TIMER ON DELAY

Timer T4:0

Time Base 0.01

Preset 600

Accum 0

I:1.0

(EN)

(DN)

(L)

O:2.0

] [

T4:0

I:1.1

( )

O:1.1

I:1.0

END

Integer file N7:01 sets the bits for Number of I/O Blocks (rung 1). By setting these bits

in this manner, you can change the number of I/O blocks for which the scanner is

configured by entering the program mode, changing N7:01 and re–entering the run

mode.

Configuration

Data Valid bit

Disable Outputs

bit

Turns alarm off

Communications

timed out timer

Turns alarm on

Pump motor

First scan bit

Communication

Status bit for I/O

block 1

Communications

timed out bit

Float switch input

Communication Status

bit for I/O block 1

Rung 2

Rung 1

Rung 3

Rung 4

Rung 5

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 39 40

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