Rockwell-automation 1771-N SERIES High Resolution Analog Module User M Bedienungsanleitung PDF herunterladen (Seite 37)

3–5Communicating With Your Analog Module

Publication 1771ĆUM127B-EN-P - December 2002

The differences between the types of 1771-N series modules is

related to the number of output channels each module has. A module

with only inputs (no outputs) requires one BTW after powerup.

Thereafter, it sends back input data and module status by way of

BTRs.

A module with outputs requires BTWs to configure it and update its

output data. BTRs are required to send back input data and module

status.

Sample Ladder Diagram Ć PLCĆ3 Family Processors

The following PLC-3 program can be used for all 1771-N series

modules. The program can be altered to effectively address modules

with or without output channels.

Figure 3.4

PLCĆ3 Family Example Program Structure

BTR

BLOCK XFER READ

RACK:

GROUP:

MODULE:

DATA FILE

#N1:0

LENGTH:

CONTROL:

#B1:10

B1:10

Block Transfer

Read Done Bit

Enable

Done

Error

Enable

Done

Error

Block Transfer

Write Done Bit

Rung 1

B1:10

MOV

SOURCE:

DESTINATION:

B1:0

B1:15

Pushbutton

Power-up Bit

B1:10

MOV

SOURCE:

DESTINATION:

B1:1

B1:15

Pushbutton

B1:10

Block Transfer

Write Done Bit

0000000000001001

Block Transfer

Write Done Bit

0000000000111011

Block Transfer

Read Error Bit

B1:10

Rung 2

Rung 3

Rung 4

BTW

BLOCK XFER WRITE

RACK:

GROUP:

MODULE:

DATA FILE

#N1:100

LENGTH:

CONTROL:

#B1:10

Block Transfer

Write Error Bit

B1:10

I0:2

N1:1

I0:2

Power-up Bit

N1:1

0000000000001001

This program changes the length of the block transfer write from 59 words at powerup

or when reconfigured, to 9 words at all other times.

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 187 188

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