ProSoft Technology 5204SE-MNET-PDPMV1 - Manual (Page 13)

Functional Overview 5204SE-MNET-PDPMV1 ♦ ProLinx Gateway
User Manual Modbus TCP/IP to PROFIBUS DP-V1 Pass-Through Master
ProSoft Technology, Inc.
Page 13 of 235
December 22, 2009
2.4 PROFIBUS DP Pass-Through Data Flow
The Application Communication Logic functions built into the latest version of
ProSoft Configuration Builder (PCB) will automatically create all the Derived Data
Types (DDTs), Variables, and Derived Function Blocks (DFBs) required by the
Modicon processor to allow it to act as a PROFIBUS DP-V1 Master for acyclic
mailbox message communication. PCB uses the PROFIBUS DP Master
configuration to create two files that may be imported into Unity Pro version 4.0
(or higher) to create these data structures and process logic.
PROFIBUS DP-V1 acyclic communication goes beyond normal cyclic I/O data
transfers by adding the capability to directly access each PROFIBUS network
slave. The types of acyclic data available varies from slave to slave but generally
include such data as alarm and status information, extended diagnostic
information, extended process data information, and device-specific special
commands.
The following illustration shows the basics of acyclic mailbox message data flow
from a Modicon processor, through the two gateway drivers, out to PROFIBUS
slaves, with responses (if any) returned to the Modicon.