Rockwell Automation D64046.5.1 U MNL WIN DDMC - Manual (Page 13)

Chapter 1
1-1
Understanding How a DDMC32
System Works
This chapter provides an overview of Distributed Diagnostics and Machine
Control (DDMC32). It contains the following sections:
Section: Page:
How the DDMC32 System Works 1-1
Understanding the SDS Instruction 1-3
Understanding the DFA Instruction 1-7
Implementing DDMC32 Instructions in Levels 1-8
DDMC32 System Components 1-8
What to do Next 1-12
Distributed Diagnostics and Machine Control (DDMC32) for
WindowsNT
t is an industrial automation system built around
programmable controllers, operator interfaces, communications, and
software. The system architecture lets you configure DDMC32 to your
manufacturing needs. Ideal in transfer line and other machine applications,
DDMC32 can be configured for other industrial applications such as
material handling, packaging, and assembling.
DDMC32 is a flexible system based on the PLC-5 family of programmable
controllers. You can use single or multiple PLC-5 processors to create
either a centralized or distributed configuration. Processors communicate
with each other over the Data Highway Plus.
Special instructions in the PLC-5 processor — a Smart Directed Sequencer
(SDS) and a Diagnostic Fault Annunciator (DFA) provide diagnostic
machine-fault detection and automatic messaging capabilities in the
DDMC32 Monitoring system. You enter SDS and DFA instructions into
ladder logic in 6200 Series software.
When a fault is detected, the SDS instruction sends a message over the
Data Highway Plus to the operator interface terminal where the Monitoring
software automatically assembles the appropriate diagnostic message.
This diagnostic message helps reduce downtime associated with
troubleshooting your equipment, because it specifies the device that caused
the fault condition and the step in the sequence when the fault occurred.
What this Chapter Contains
How the DDMC32 System
Works