Rockwell-automation 1771-N SERIES High Resolution Analog Module User M Manuel d'utilisateur télécharger pdf (Page 35)

3–3Communicating With Your Analog Module

Publication 1771ĆUM127B-EN-P - December 2002

Figure 3.1

PLCĆ3 Family Sample Program Structure

BTR

BLOCK XFER READ

RACK:

GROUP:

MODULE:

DATA:

XXX

X = XXXX

XXXX:XXXX

LENGTH:

CNTL:

XXXX:XXXX

BTW

BLOCK XFER WRITE

RACK:

GROUP:

MODULE:

DATA:

XXX

X = XXXX

XXXX:XXXX

LENGTH:

CNTL:

XXXX:XXXX

Block Transfer

Read Done Bit

Enable

Done

Error

Enable

Done

Error

Block Transfer

Write Done Bit

Program Action

At powerup, the user program enables a

block transfer read. Then it initiates a

block transfer write to configure module.

Thereafter, the program continuously perĆ

forms read and write block transfers.

This program is very similar to the PLC-3 program with the

following exceptions:

• Block transfer enable bits are used instead of done bits as the

conditions on each rung.

• Separate block transfer control files are used for the block

transfer instructions.

Figure 3.2

PLCĆ5 Family Sample Program Structure

BTR

BLOCK XFER READ

RACK:

GROUP:

MODULE:

CONTROL:

XXX:XX

DATA FILE:

LENGTH:

CONTINUOUS:

XXX:XX

BTR Enable

BTW

BLOCK XFER WRITE

RACK:

GROUP:

MODULE:

CONTROL:

XXX:XX

DATA FILE:

LENGTH:

CONTINUOUS:

XXX:XX

BTR

BTW

Enabl

BTW Enable

Enable

Program Action

At powerup, the user program enables a

block transfer read. Then it initiates a block

transfer write to configure module.

Thereafter, the program continuously perĆ

forms read and write block transfers.

PLCĆ5 and PLCĆ5/250

Program Example

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Rockwell-automation 1771-N SERIES High Resolution Analog Module User M Manuel d'utilisateur Page 35

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