Automating Manufacturing Systems - Process Control and ...

plc software - 32.21
ing”, Proceedings of the First Automation Fair, Philadelphia, 1990.
Paques, Joseph-Jean, “Basic Safety Rules for Using Programmable Controllers”, ISA Transactions,
Vol. 29, No. 2, 1990.
32.8 SUMMARY
• Debugging and forcing are signs of a poorly written program.
• Process models can be used to completely describe a process.
• When programming large systems, it is important to subdivide the project into
smaller parts.
• Documentation should be done at all phases of the project.
32.9 PRACTICE PROBLEMS
1. List 5 advantages of using structured design and documentation techniques.
32.10 PRACTICE PROBLEM SOLUTIONS
1. more reliable programs - less debugging time - more routine - others can pick up where you left
off - reduces confusion
32.11 ASSIGNMENT PROBLEMS
1. What documentation is requires for a ladder logic based controller? Are comments important?
Why?
2. When should inputs and outputs be assigned when planning a control system?
3. Discuss when I/O placement and wiring documentation should be updated?
4. Should you use output forces?
5. Find web addresses for 10 PLC vendors. Investigate their web sites to determine how they
would be as suppliers.