Rockwell-automation 1771-QB Linear Pos. Manual do Utilizador descarregar pdf (Página 147)

Sample Application Programs

Chapter 10

103

You should program a PLC-5 processor’s block transfer to use the bidirectional

method to avoid problems when troubleshooting the module. However, block

transfer writes only need to be enabled when a command block, motion blocks,

setpoint blocks or a parameter block must be sent to the module.

Important: Processor execution of block transfer instructions is asynchronous

to the program scan. The status of these bits could change at any point in the

program scan. If the data must be synchronized to the program scan, transfer the

block transfer read instruction to a storage location via a file-to-file move. The

program can then examine data in the storage location.

Figure 10.2

Block

Transfer Instructions for PLC5 Controllers

50112

BTR

ENABLE

N7:0

] / [

BTW

ENABLE

N7:5

] / [

BTR

BLOCK TRNSFR READ

Rack

Group 0

Module 0

Control Block

N7:0

Data file

N44:1

Length

Continuous N

( EN )

( DN )

( ER )

BTR

ENABLE

N7:0

] / [

BTW

ENABLE

N7:5

] / [

BTW

BLOCK TRNSFR WRITE

Rack

Group 0

Module 0

Control Block

N7:5

Data file

N45:131

Length 0

Continuous N

( EN )

( DN )

( ER )

With this simple application program, the module controls the motion of a

single axis. Figure 10.3 shows the axis movement profile. Four setpoints in the

setpoint block control axis motion for this loop. The first three setpoints specify

local velocity and acceleration/deceleration, while the fourth setpoint uses the

global velocity and acceleration/deceleration defined in the parameter block.

Setting the fourth setpoint’s local acceleration and deceleration words to zero

forces it to use global parameters. The first three setpoints cause axis movement

in one direction, while the fourth returns the axis to the original position.

PLC5 Block Transfer

Instructions

Application Program #1

1 2 ... 142 143 144 145 146 147 148 149 150 151 152 ... 225 226

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