Presentation
PLC scanning tutorial
- Institution
- AQA
the document goes in depth on how a PLC scanning systems works
[Show more]
Seller
Follow
Content preview
F5HO12 Applications of PLC TutorialPlease answer all the questions in your own words.
You may use Microsoft word or take a picture of your working and paste it
into this document.
1. Describe in your own words how continuous updating works and what
type of PLC it is suited to?
A CTU (microprocessor) scans a number of input contacts as called for
In a sequence of instructions this may vary depending on instruction.
An outport is then directly driven on instructions following logical out
Instructions.
Outputs are latched until the following scan cycle begins, an input scanner uses software ( built in delay) this prevents contact
bounce which makes the input state read.
This method is only used for Small PLC’s due to timing sequences.
2. Describe in your own words how Mass Input/Output Copying works and
what type of PLC it is suited to?
Mass I/O copying works by scanning inputs and facsimile to RAM. Fetch and decode followed by executing of all program
instructions of sequence of copying output facsimile to RAM. Once all the program has been processed a CPU will use
diagnostics and communications. Will update all outputs and then cycle will repeat.
Mass I/O Is used by companies such as Tennets Larger for example there bottling plant produces 100,000 cans of larger per hour
a continuous update PLC could not handle the demand there fore a Mass plc system must be used. This is due to the timing
sequence.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller aharvie1. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £6.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
59325 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now