ProSoft Technology PTQ-PDPMV1 - Manual (Page 136)

Configuring the Processor with Concept 2.6 PTQ-PDPMV1 ♦ Quantum Platform
User Manual PROFIBUS DP Master Network Interface Module for Quantum
Page 136 of 306 ProSoft Technology, Inc.
August 12, 2014
4.12 Mailbox Overview
This section provides a brief description on how to use each mailbox function
block. Refer to Mailbox Messaging (page 151) for detailed information about
each mailbox parameter:
4.12.1 Acyclic Read Mailbox
Function Block: ACCREAD
Trigger Register: AcRead
Description: The ACCREAD mailbox is used to perform an Acyclic Read
request to a PROFIBUS slave device. The input pins SlvAdIn (PROFIBUS slave
address), SlotIn (slot number), IndexIn (index number), and LngthIn (length -
number of bytes associated to acyclic read operation) must be configured before
triggering the mailbox request. The acyclic read response data is copied to the
ReadData output pin. The status information is available in the output pins
(ErrCode, ErrDecode, ExtFault, and FaultInf).
The following illustration shows a sample instance of the Acyclic Read mailbox
function block: