PLC Siemens S7 300/400

DESCRIPTION

• Be able to recognize S7 hardware and be able to replace modules when a fault occurs.
• Be able to operate the Step 7 software to make it perform certain tasks.
• Understand basic S7 instruction set and be able to make minor modifications to software.
• Be able to backup and restore a PLC program when required.
• Be able to perform basic system diagnostics when a problem occurs.

  COURSE CONTENT 1. How Exactly Does A PLC Work?

• The Led on the output card means i am getting voltage out right? does it?
• What exactly happens in between? theres more than just a program in the CPU
• How exactly does it scan the program?
• What is this Watchdog Timer? Is it that important?
• Can I use the same output twice? That's bad programming isn't it?
• A PLC is a logic controller, so use a logical approach to fault find it.
• What are the 8 simple test points to check?
• The PLC is in RUN, that means theres a program right? does it?
• FORCING a bit and toggling a bit is pretty much the same yeah? depends on which PLC

2. How Do I Do The Following?

• How do I check power is ON and PLC is in right mode (RUN or Program)
• Check for a fault condition (is SF LED ON)
• Establish a link to the PLC (accessible nodes)
• If comms problem check PG/PC interface
• Create a blank project and take a backup
• Open project for PLC and go On Line
• Interrogate Diagnostics Buffer
• Identify if it is a hardware or software fault?
• Change the battery
• Change modules if necessary (with spares and without spares)
• Identify if it is a PLC or Comms fault (Profibus or MPI)
• Check all settings against a template, Node Address etc
• Check Hardware Configuration
• Clear Memory and Download program
• Check software against latest copy (Compare function)
• Monitor program
• Searching for specific operands and instructions
• Changing timer, counter values On Line
• Making minor mods Off Line and On Line
• Check or create a VAT table to establish parameter status
• Force a parameter if required
• Call up reference data to assist with software diagnostics
• Archive and Retrieve project
• Display Documentation (Symbols, Comments)
• Reassign an I/O address and change software addresses (Rewire Function)
• Printing Cross Reference/Program Listings etc

3. Background information also covered 4. Understanding of the following :

• Number formats, bits, bytes, words, double words
• Binary, HEX, octal, floating point, integer
• Data types and parameter types, Bool etc
• Block types
• Variable types (local and global)
• How to monitor various blocks
• Ladder, STL programs
• Basic Instructions, contacts, Set, reset etc
• Timers, Counters
• Comparators, Maths
• How to make minor mods
• Altering values in a VAT table
• Back tracking through a program to establish where power flow stops
• Overall reset procedure
• Fault finding tips

5. Course Equipment Per Delegate

• S7 300 or 400 PLC
• PC or Laptop
• Simulator

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