Rockwell Automation 1771-QDC, D17716.5.86(Passport) PLASTIC MOLDING MODULE - Manual (Page 56)

Chapter
4
4-1
Overview of Remaining
Configuration Procedures
This chapter introduces you to the remaining procedures necessary to
successfully configure your QDC module. You must follow the
procedures in the given order. Please use this chapter as a guide.
The QDC module communicates with your PLC-5 processor through data
“blocks”. These blocks are made up of several 16-bit words stored in the
PLC-5 data table. The QDC module accesses these areas of data table
through the 1771 backplane. There are two types of data blocks:
Command Blocks - these blocks are downloaded from the PLC-5 data
table to the QDC module to make configuration changes or initiate
machine actions
Status Blocks - the QDC module uses these blocks to send information
to the PLC-5 processor about current operating status
The configuration procedure detailed over the next several chapters makes
extensive use of command and status blocks. You will:
enter important operating data into all applicable command blocks
read machine operating data in status blocks to assist you in the
configuration procedure
Command Blocks
You configure the QDC module with a series of command blocks.
Command blocks are an area of the PLC-5 data table containing machine
commands, set-up, and operating information for the QDC module. On
power-up, or when initiated by a user, command blocks are downloaded
from the PLC-5 data table to the QDC module.
Chapter Objectives
Configuration Concepts