User manual

Configuring the Processor with Unity Pro PTQ-PDPMV1 ♦ Quantum Platform
User Manual PROFIBUS DP Master Network Interface Module for Quantum
Page 92 of 306 ProSoft Technology, Inc.
August 12, 2014
3.5.2 Acyclic Write Mailbox
Function Block: ACYCLWRITE
Trigger Byte: Acyclicwrite
Description: The ACYCLWRITE function block is used to perform an Acyclic
Write request to a PROFIBUS slave device. The input pins SlaveAddress
(PROFIBUS slave address), SlotNumber (slot number), IndexIn (index number)
and LengthIn (length - number of bytes associated to acyclic read operation)
must be configured before triggering the mailbox request. The actual data to be
written to the PROFIBUS slave should be associated to the WriteData input pin.
The status information is available at the output pins (ErrorCode, ErrorDecode,
ExtendedFaultInfo and FaultInformation).
The following illustration shows a sample instance of the Acyclic Write mailbox
function.