Introducing classic plcć5 processor modules – Rockwell Automation 1785-LTx,D17856.2.1 Classic PLC-5 Programmable Controllers Users Manual User Manual

Page 15

Advertising
background image

Understanding Your System

Chapter 1

1-5

The program-development portion of your functional specification can be
in any form: written statement; flowchart; or rough-draft MCPs, SFCs,
and subroutines. Use the form that is most familiar to you. We
recommend, however, that you generate rough-draft SFCs and subroutines
so that you have a better correspondence between your beginning diagrams
and your finished program.

Detailed Analysis

In this phase, you identify the logic needed to plan your programs. This
includes inputs, outputs, specific actions, and transitions between actions
(i.e., the bit-level details needed to write your program).

Program Development

You enter the programs either offline into your computer or online into a
processor. In the next phase, you test the programs that you have entered.
Once testing is complete, your resulting programs should match your
functional specification.

Checking for Completeness

When you complete the functional specification and the detailed analysis,
review them and check for missing or incomplete information such as:

input

conditions

safety

conditions

startup or emergency shutdown routines
alarms and alarm handling
fault detection and fault handling
message display of fault conditions
abnormal operating conditions

The following is a list of the PLC-5 processors and their catalog numbers.

Processor

Catalog Number

PLCĆ5/10t

1785ĆLT4

PLCĆ5/12t

1785ĆLT3

PLCĆ5/15t

1785ĆLT

PLCĆ5/25t

1785ĆLT2

For information on other PLC-5 processors (Enhanced, Ethernet, or
ControlNet), see your Allen-Bradley representative.

Introducing Classic PLCĆ5

Processor Modules

Advertising