Prosoft-technology 5205-DFNT-PDPS Uživatelský manuál stáhnout pdf (Strana 18)

PDPS ♦ ProLinx Gateway Functional Overview

PROFIBUS DP Slave

Page 18 of 61 ProSoft Technology, Inc.

December 31, 2008

3 In the PLC Program create an array of 200 bytes. The contents of the array

are described in the Mailbox Command and Mailbox Structure tables.

2.4 Mailbox Commands

Start Value Stop Value Direction Description

150 151

PLC to PDPM to

PDPS

Database Write transfer, from the PLC's

perspective.

The value of 150 in the specific Array index

location as indicated in the Mailbox structure

table will cause the PROFIBUS Slave driver to

transfer the data in the 200 Byte array to the

Database locations above word 400. The Value

of 151 stops the data transfer.

160 161

PDPS to PDPM to

PLC

Database Read transfer, from the PLC's

perspective.

The value of 160 in the specific Array index

location as indicated in the Mailbox structure

table will cause the PROFIBUS Slave driver to

transfer the data to the 200 Byte array from the

Database locations above word 400. The Value

of 161 stops the data transfer.

PLC = PROFIBUS master interface in PLC.

PDPM = PROFIBUS Master.

PDPS = PROFIBUS Slave.

NOTES:

The block number for each device must be changed to trigger an operation.

The I/O data area is owned exclusively by only the PLC or PDPM.

A timeout must be implemented in the PLC in case the PDPM is not present.

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Prosoft-technology 5205-DFNT-PDPS Uživatelský manuál Strana 18