Rockwell Automation 1785-LTx,D17856.2.1 Classic PLC-5 Programmable Controllers Users Manual - Manual (Page 15)

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