Rockwell Automation D64046.5.1 U MNL WIN DDMC - Manual (Page 14)

Chapter 1
Understanding How a DDMC32 System Works
1-2
The DDMC32 System illustration (seen below) shows how DDMC32 uses
the SDS instruction to detect a fault condition and send the diagnostic
message to the operator interface.
DDMC32 System
3. Background task
extracts information from
data base and constructs
message.
SDS
While SLIDE was
ADVANCING, the
returned LS
turned ON.
E M S G
1. SDS instruction detects a
fault condition.
PLC-5/20
PLC-5/20
IMC 123
IMC 120
2. PLC sends encoded
message to operator
interface on Data
Highway Plus.
Input to PLC-5
4. Concatenated message
is displayed on CRT and
passed out COM 1 port.
Symbol
Data
Base
Operator Interface