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PLC System Documentation and Software Packages for Effective Troubleshooting and Maintenance

Learn about the importance of system documentation packages, including the system overview, configuration diagram, I/O assignments, and program backup. Explore the value of documentation during installation, troubleshooting, system start-up, and outside service calls. Discover how software packages provide ladder rung documentation, including instruction symbols, descriptions, and comments.

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PLC System Documentation and Software Packages for Effective Troubleshooting and Maintenance

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  1. Chapter 15 Documenting Your PLC System

  2. Objectives (1 of 2) • Explain what is contained in a system documentation package. • Describe why a system documentation package should be developed. • State when the documentation package is usually developed. • List what documentation features the typical PLC software development package offers. • Explain the value of documentation during troubleshooting.

  3. Objectives (2 of 2) • Describe the value of documentation if you have to expand the present system. • Explain a rung description. • Describe a rung symbol and the advantage of using symbols. • State the value of documentation during system start-up. • Explain the value of documentation during an outside service person’s service call.

  4. PLC System Documentation • A documentation package is an orderly collection of information concerning the configuration and operation of your system. • It is typically put together as the system is designed.

  5. PLC System Documentation Usage • Installation • Debugging • Start-up • Maintenance • Modification • System duplication

  6. Why Add Documentation to User Program? • Assists installers to install and start up system • Helps maintenance individuals troubleshoot and maintain system • Provides information to operators who must understand how system works • Assists in answering system upgrade questions • Enables outside service people understand system for maintenance, servicing, or upgrade • Allows easy reproduction of system

  7. What Should Be Included in Documentation Package? • System overview • Diagram of system configuration • I/O address assignments • Internal coil address assignments • Data table assignments • Program printout • Control program backup • Wiring diagrams

  8. Sample Diagram of System Configuration

  9. Typical Wiring for a 120 VAC Input Module

  10. Typical Wiring for a 120 VAC Output Module

  11. Diagram of System Configuration

  12. Seven-Slot Chassis with I/O Modules Assigned

  13. Internal Bit Allocation Table

  14. Timer Address Allocation Table

  15. Integer File Allocation Table

  16. Documentation andSoftware Packages • PLC program development software provides readily available documentation features. • Hard copy print out of all data and ladder files • Cross-reference reports • Hard copy of ladder rungs • Memory usage • Processor configuration data

  17. Software Ladder Rung Documentation • Software packages provide ladder rung documentation as program is developed. • Rung documentation can be added later or modified by maintenance individuals. • Software packages ladder rung documentation • Page titles • Rung comments • Instruction symbols • Instruction descriptions • Instruction comments

  18. RSLogix 500 Ladder Documentation

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