Bradley Smoker user manual Introduction to PLC-5 Controller Scanning

Chapter 5

Communicating with Controller-Resident I/O

Using This Chapter

For Information About	Go to Page
Introduction to PLC-5 controller scanning	5-1
Program scanning	5-2
Transferring data to controller-resident I/O	5-3
Configuring the system for controller-resident I/O	5-4

Introduction to PLC-5

Controller Scanning

a. read the status of various input devices (such as pushbuttons and limit switches)

This chapter explains how to configure the controller to communicate with resident I/O:

1.Set the I/O chassis switch for the addressing mode.

2.Set the rack address.

The rack address defaults to 0. If you want to change the rack address to 1, set bit S:26/2.

The basic function of a programmable-controller system is to:

make decisions via a control program b. like ladder logic based on the status of

those devices

set the status of output devices c. (such as lights, motors, and

heating coils)

Publication 1785-UM012D-EN-P - July 2005