Rockwell Automation 1771-PM , D17716.5.18 U MNL 1771-PM CLUTCH/BRAKE MOD - Manual (Page 24)

Chapter
4
4Ć1
PLC Ladder Programming
This chapter will help you become familiar with:
programming fundamentals as they relate to your clutch/brake
controller
the need for press configuration rungs
relationships between your press configuration rungs and backplane
switch settings
relationships between configuration rungs and voting processor
firmware
the option of monitoring the press through your PLC ladder program
the option of using PLC report generation to display messages that you
have stored.
Your PLC ladder program is composed of instructions that you enter into
PLC memory. These instructions are organized into rungs. They
typically monitor inputs and control outputs.
Your PLC ladder program does not control your clutch/brake controller,
but it does configure and enable it. Although your ladder program cannot
control any clutch/brake controller outputs, it controls output image table
bits to configure and enable the voting processors. Your ladder program
may examine input image table bits to monitor clutch/brake controller
functions as we will explain later.
This chapter concentrates on PLC ladder programming that relates to your
clutch/brake controller. For more details on ladder programming, refer to
the programming manual that applies to your PLC processor. These
publications are listed in our Systems Division Publication Index
(publication SD499).
PLC ladder programming is described in this chapter as it relates to
clutch/brake controller hardware and voting processor firmware
(Figure 4.1).
Chapter Objectives
Programming Fundamentals