Prosoft-technology MVI56E-SIE Manual do Utilizador descarregar pdf (Página 140)

Reference MVI56E-SIE ♦ ControlLogix Platform

User Manual Client Communication Module

Page 140 of 168 ProSoft Technology, Inc.

September 6, 2012

Write Block

These blocks of data transfer information from the ControlLogix processor to the

module.

The following table describes the structure of the output image.

Write Block from Processor to Module

Word Offset

Description

Length

Write Block ID

1 to 200

Write Data

200

201 to 220

Command bit data for Clients (set)

231 to 246

Spare

247

Select Priority Read Block

The Write Block ID is an index value used to determine the location in the

module’s database where the data will be placed. Each transfer can move up to

200 words (block offsets 1 to 200) of data.

Select Priority Read Block (Write Block Offset 247)

This register allows the processor to select which read blocks will be returned

from the module. If this register equals zero, the module will return all read blocks

in sequential order.

If this register has a non-zero value, the module will return the read block

selected, and the following one.

This feature can be used for applications that require some read blocks to be

updated more frequently than other blocks.

The following illustrations show the effect of changing the value of the Select

Priority Read Block register (Write Block offset 247). In the following histogram

curve, the Select Priority Read Block is equal to 0.

 Local:1.O.Data[247] = Select Priority Read Block.

 Local:1.I.Data[249] = Read Block ID.

1 2 ... 135 136 137 138 139 140 141 142 143 144 145 ... 167 168

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Prosoft-technology MVI56E-SIE Manual do Utilizador Página 140