To achieve unit certification, candidates must be able to:
- Demonstrate an Understanding of the Internal Architecture of PLCs, their Applications and Knowledge of the Number Systems they use.
- Demonstrate an Understanding of Typical Input and Output Devices used with PLCs, their Selection and how they are Interfaced to the PLC.
- Investigate and Display an Understanding of the Basic Programming Techniques used with PLCs.
- Produce a Correctly Developed Program for a PLC to Control a Specified Process and Document the Completed Program to a Satisfactory Standard.
- Demonstrate an Understanding of How to Monitor PLC Operation, Force Devices and Fault Find PLC Controlled Processes.
To fault find a system you need to know EXACTLY how it works
Am I getting the input to the PLC?
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
Then you need to know the specifics
- 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 (just in case I mess up)
- Open project for PLC and go OnLine
- 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.
- Background information also covered
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
- Reference Guide
Course Equipment (per delegate)
- Siemens S7 PLC
- PC or Laptop
Course: Siemens S7 EAL Level 3 Unit (601/5326/ X Programmable Logic Controllers 3)
Excellent course. Would highly recommend, especially for any engineers leaving the forces and going in to a maintenance role
- Steven Meldrum (December 18, 2020)
Course: Siemens S7 1200 and WinCC HMI Basics
Fantastic course, covering everything in the title and more. Highly recommended.
- Ian Austin (November 27, 2020)
Course: Siemens S7 1200/1500 and WinCC TIA Portal Level 2
Attended the training course as above, From enquiring the staff were most helpful, learned a lot on the course, information and equipment was excellent.
Would recommend to anybody.
- Jack Cameron (November 27, 2020)
Course: Siemens S7 1200 and WinCC HMI Basics
I had a fantastic week with Rob learning all about Siemens S7 1200 and HMI. I learned a lot and Rob was a great host… would 100 percent recommend.
- Chris Guyatt (September 24, 2020)
Course: Siemens S7 300/400 PLC & WinCC Flex HMI Level 1
This is a great course which covered a great range of the Siemens plc program. Both instructors were very knowledgeable and friendly. I would highly recommend.
- Daniel Forster (June 26, 2020)
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