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
PLC5/10t
1785LT4
PLC5/12t
1785LT3
PLC5/15t
1785LT
PLC5/25t
1785LT2
For information on other PLC-5 processors (Enhanced, Ethernet, or
ControlNet), see your Allen-Bradley representative.
Introducing
Classic PLC5
Processor Modules
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