Course Content
To fault find a system you need to know EXACTLY how it works HOW EXACTLY DOES A PLC WORK? -
Am I getting the input to the PLC? -
The Led on the output card means i am getting voltage out right? does 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? Then you need to Know the specifics HOW DO I DO THE FOLLOWING? (some straight forward some not so) - How do I check power is ON and PLC is in right mode (RUN or Program)
- Check for a fault condition
- Establish a link between PC and PLC (can be a major issue nowadays)
- Create a blank project and take a backup (just in case I mess up)
- Open project for PLC and go OnLine
- Interrogate Diagnostics
- Identify if it is a hardware or software fault?
- Change the battery
- Change input / output cards if necessary, (with spares and without spares)
- Identify if it is a PLC or Comms fault
- Check all settings against a template etc.
- Check Hardware ( What voltage should be where)
- Clear Memory and Download program
- Check software against latest copy
- Monitor program effectively
- Understand Basic Ladder Programs
- Searching for specific operands and instructions
- Check or create a monitor table to establish parameter status
- Call up reference data to assist with software diagnostics
- Display Documentation (Symbols, Comments)
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