Rockwell Automation 1771-QDC, D17716.5.87(Passport) CLAMP AND EJECT MODE - Manual (Page 54)

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
“Blocks”. Blocks are made up of several 16-bit words stored in the PLC-5
data table. These areas of the PLC data table are accessed by the QDC
module through the 1771 backplane. There are two types of blocks:
Command Blocks - these blocks are downloaded from the PLC data
table to the QDC module to make configuration changes or initiate
machine actions
Status Blocks - These blocks are used by the QDC module to relay
information to the PLC processor about the QDC module’s current
operating status
The configuration process 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 procedures
Command Blocks
The QDC module is configured through a series of blocks known as
command blocks. Command blocks are an area of the PLC data table
containing machining 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 data table to the QDC module.
Chapter Objectives
Configuration Concepts